Repository: nurkiewicz/completablefuture
Branch: master
Commit: ca32c78fc1bc
Files: 33
Total size: 471.3 KB

Directory structure:
gitextract_nam_xqsx/

├── .gitignore
├── README.md
├── pom.xml
└── src/
    └── test/
        ├── java/
        │   └── com/
        │       └── nurkiewicz/
        │           └── reactive/
        │               ├── S00_About.java
        │               ├── S01_Introduction.java
        │               ├── S02_Creating.java
        │               ├── S03_Map.java
        │               ├── S04_FlatMap.java
        │               ├── S05_Zip.java
        │               ├── S06_AllAny.java
        │               ├── S07_AsyncCallback.java
        │               ├── S08_ErrorHandling.java
        │               ├── S09_Promises.java
        │               ├── S10_AsyncHttp.java
        │               ├── S11_Cancelling.java
        │               ├── S12_RxJava.java
        │               ├── stackoverflow/
        │               │   ├── ArtificialSleepWrapper.java
        │               │   ├── FallbackStubClient.java
        │               │   ├── HttpStackOverflowClient.java
        │               │   ├── InjectErrorsWrapper.java
        │               │   ├── LoadFromStackOverflowTask.java
        │               │   ├── LoggingWrapper.java
        │               │   ├── Question.java
        │               │   └── StackOverflowClient.java
        │               └── util/
        │                   ├── AbstractFuturesTest.java
        │                   ├── Futures.java
        │                   └── InterruptibleTask.java
        └── resources/
            ├── clojure-questions.html
            ├── groovy-questions.html
            ├── java-questions.html
            ├── logback-test.xml
            ├── scala-questions.html
            └── twitter4j.properties

================================================
FILE CONTENTS
================================================

================================================
FILE: .gitignore
================================================
target
.idea
*.iml
.idea


================================================
FILE: README.md
================================================
# CompletableFuture in Java 8 - asynchronous processing done right

## Tomasz Nurkiewicz

Twitter: [@tnurkiewicz](https://twitter.com/tnurkiewicz)

Works for: [@4financeit](https://twitter.com/4financeit)

E-mail: my last name `@gmail.com`

Home: [www.nurkiewicz.com](http://www.nurkiewicz.com)

Source code: [www.github.com/nurkiewicz/completablefuture](http://www.github.com/nurkiewicz/completablefuture)


================================================
FILE: pom.xml
================================================
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
	<modelVersion>4.0.0</modelVersion>
	<groupId>com.nurkiewicz</groupId>
	<artifactId>completablefuture</artifactId>
	<version>0.0.1-SNAPSHOT</version>

	<properties>
		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
	</properties>

	<dependencies>
		<dependency>
			<groupId>commons-io</groupId>
			<artifactId>commons-io</artifactId>
			<version>2.4</version>
		</dependency>
		<dependency>
			<groupId>com.google.guava</groupId>
			<artifactId>guava</artifactId>
			<version>18.0</version>
		</dependency>
		<dependency>
			<groupId>org.jsoup</groupId>
			<artifactId>jsoup</artifactId>
			<version>1.7.3</version>
		</dependency>

		<!-- Logging -->
		<dependency>
			<groupId>ch.qos.logback</groupId>
			<artifactId>logback-classic</artifactId>
			<version>1.1.3</version>
		</dependency>
		<dependency>
			<groupId>org.slf4j</groupId>
			<artifactId>jul-to-slf4j</artifactId>
			<version>1.7.5</version>
		</dependency>
		<dependency>
			<groupId>org.slf4j</groupId>
			<artifactId>log4j-over-slf4j</artifactId>
			<version>1.7.5</version>
		</dependency>
		<dependency>
			<groupId>org.slf4j</groupId>
			<artifactId>jcl-over-slf4j</artifactId>
			<version>1.7.5</version>
		</dependency>
		<dependency>
			<groupId>commons-logging</groupId>
			<artifactId>commons-logging</artifactId>
			<version>1.1.3</version>
			<scope>provided</scope>
		</dependency>
		<dependency>
			<groupId>com.ning</groupId>
			<artifactId>async-http-client</artifactId>
			<version>1.8.8</version>
		</dependency>
		<dependency>
			<groupId>io.reactivex</groupId>
			<artifactId>rxjava</artifactId>
			<version>1.0.11</version>
		</dependency>

		<!-- Testing -->
		<dependency>
			<groupId>junit</groupId>
			<artifactId>junit</artifactId>
			<version>4.11</version>
			<scope>test</scope>
		</dependency>
		<dependency>
			<groupId>org.assertj</groupId>
			<artifactId>assertj-core</artifactId>
			<version>3.0.0</version>
			<scope>test</scope>
		</dependency>
		<dependency>
			<groupId>org.mockito</groupId>
			<artifactId>mockito-all</artifactId>
			<version>1.9.5</version>
		</dependency>
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-web</artifactId>
			<version>3.2.4.RELEASE</version>
		</dependency>

	</dependencies>

	<build>
		<plugins>
			<plugin>
				<artifactId>maven-compiler-plugin</artifactId>
				<version>3.1</version>
				<configuration>
					<source>1.8</source>
					<target>1.8</target>
				</configuration>
			</plugin>
			<plugin>
				<groupId>org.apache.maven.plugins</groupId>
				<artifactId>maven-release-plugin</artifactId>
				<version>2.4</version>
			</plugin>
		</plugins>
	</build>

</project>


================================================
FILE: src/test/java/com/nurkiewicz/reactive/S00_About.java
================================================
package com.nurkiewicz.reactive;

/**
 *
 * Tomasz Nurkiewicz
 *
 * @tnurkiewicz | @4financeit
 *
 * www.nurkiewicz.com
 *
 * www.github.com/nurkiewicz/completablefuture
 *
 */
public class S00_About {
}


================================================
FILE: src/test/java/com/nurkiewicz/reactive/S01_Introduction.java
================================================
package com.nurkiewicz.reactive;

import com.nurkiewicz.reactive.stackoverflow.LoadFromStackOverflowTask;
import com.nurkiewicz.reactive.util.AbstractFuturesTest;
import org.junit.Test;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.concurrent.Callable;
import java.util.concurrent.Future;

public class S01_Introduction extends AbstractFuturesTest {

	private static final Logger log = LoggerFactory.getLogger(S01_Introduction.class);

	/**
	 * Broken abstraction - blocking method calls
	 */
	@Test
	public void blockingCall() throws Exception {
		final String title = client.mostRecentQuestionAbout("java");
		log.debug("Most recent Java question: '{}'", title);
	}

	@Test
	public void executorService() throws Exception {
		final Callable<String> task = () -> client.mostRecentQuestionAbout("java");
		final Future<String> javaQuestionFuture = executorService.submit(task);
		//...
		final String javaQuestion = javaQuestionFuture.get();
		log.debug("Found: '{}'", javaQuestion);
	}

	/**
	 * Composing is impossible
	 */
	@Test
	public void waitForFirstOrAll() throws Exception {
		final Future<String> java = findQuestionsAbout("java");
		final Future<String> scala = findQuestionsAbout("scala");

		//???
	}

	private Future<String> findQuestionsAbout(String tag) {
		final Callable<String> task = new LoadFromStackOverflowTask(client, tag);
		return executorService.submit(task);
	}

}



================================================
FILE: src/test/java/com/nurkiewicz/reactive/S02_Creating.java
================================================
package com.nurkiewicz.reactive;

import com.nurkiewicz.reactive.util.AbstractFuturesTest;
import org.junit.Test;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.concurrent.CompletableFuture;

public class S02_Creating extends AbstractFuturesTest {

	private static final Logger log = LoggerFactory.getLogger(S02_Creating.class);

	/**
	 * Already completed future
	 */
	@Test
	public void completed() throws Exception {
		final CompletableFuture<Integer> answer =
				CompletableFuture.completedFuture(42);

		final int fortyTwo = answer.get();  //does not block
	}

	/**
	 * Built-in thread pool
	 */
	@Test
	public void supplyAsync() throws Exception {
		final CompletableFuture<String> java =
				CompletableFuture.supplyAsync(() ->
								client.mostRecentQuestionAbout("java")
				);
		log.debug("Found: '{}'", java.get());
	}

	/**
	 * Custom thread pool, equivalent (*) to submit()
	 */
	@Test
	public void supplyAsyncWithCustomExecutor() throws Exception {
		final CompletableFuture<String> java =
				CompletableFuture.supplyAsync(
						() -> client.mostRecentQuestionAbout("java"),
						executorService
				);
		log.debug("Found: '{}'", java.get());
	}

}



================================================
FILE: src/test/java/com/nurkiewicz/reactive/S03_Map.java
================================================
package com.nurkiewicz.reactive;

import com.nurkiewicz.reactive.util.AbstractFuturesTest;
import org.jsoup.nodes.Document;
import org.jsoup.nodes.Element;
import org.junit.Test;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.concurrent.CompletableFuture;

public class S03_Map extends AbstractFuturesTest {

	private static final Logger log = LoggerFactory.getLogger(S03_Map.class);

	@Test
	public void oldSchool() throws Exception {
		final CompletableFuture<Document> java =
				CompletableFuture.supplyAsync(() ->
								client.mostRecentQuestionsAbout("java"),
						executorService
				);

		final Document document = java.get();       //blocks
		final Element element = document.
				select("a.question-hyperlink").get(0);
		final String title = element.text();
		final int length = title.length();
		log.debug("Length: {}", length);
	}

	/**
	 * Callback hell, doesn't compose
	 */
	@Test
	public void callbacksCallbacksEverywhere() throws Exception {
		final CompletableFuture<Document> java =
				CompletableFuture.supplyAsync(() ->
								client.mostRecentQuestionsAbout("java"),
						executorService
				);

		java.thenAccept(document ->
				log.debug("Downloaded: {}", document));
	}

	@Test
	public void thenApply() throws Exception {
		final CompletableFuture<Document> java =
				CompletableFuture.supplyAsync(() ->
								client.mostRecentQuestionsAbout("java"),
						executorService
				);

		final CompletableFuture<Element> titleElement =
				java.thenApply((Document doc) ->
						doc.select("a.question-hyperlink").get(0));

		final CompletableFuture<String> titleText =
				titleElement.thenApply(Element::text);

		final CompletableFuture<Integer> length =
				titleText.thenApply(String::length);

		log.debug("Length: {}", length.get());
	}

	@Test
	public void thenApplyChained() throws Exception {
		final CompletableFuture<Document> java =
				CompletableFuture.supplyAsync(() ->
								client.mostRecentQuestionsAbout("java"),
						executorService
				);

		final CompletableFuture<Integer> length = java.
				thenApply(doc -> doc.select("a.question-hyperlink").get(0)).
				thenApply(Element::text).
				thenApply(String::length);

		log.debug("Length: {}", length.get());
	}

}



================================================
FILE: src/test/java/com/nurkiewicz/reactive/S04_FlatMap.java
================================================
package com.nurkiewicz.reactive;

import com.nurkiewicz.reactive.stackoverflow.Question;
import com.nurkiewicz.reactive.util.AbstractFuturesTest;
import org.jsoup.nodes.Document;
import org.junit.Test;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.http.HttpStatus;

import java.util.concurrent.CompletableFuture;

public class S04_FlatMap extends AbstractFuturesTest {

	private static final Logger log = LoggerFactory.getLogger(S04_FlatMap.class);

	@Test
	public void thenApplyIsWrong() throws Exception {
		final CompletableFuture<CompletableFuture<Question>> future =
				javaQuestions()
						.thenApply(doc ->
								findMostInterestingQuestion(doc));
	}

	@Test
	public void thenAcceptIsPoor() throws Exception {
		javaQuestions().thenAccept(document -> {
			findMostInterestingQuestion(document).thenAccept(question -> {
				googleAnswer(question).thenAccept(answer -> {
					postAnswer(answer).thenAccept(status -> {
						if (status == HttpStatus.OK.value()) {
							log.debug("OK");
						} else {
							log.error("Wrong status code: {}", status);
						}
					});
				});
			});
		});
	}

	@Test
	public void thenCompose() throws Exception {
		final CompletableFuture<Document> java = javaQuestions();

		final CompletableFuture<Question> questionFuture =
				java.thenCompose(doc -> findMostInterestingQuestion(doc));

		final CompletableFuture<String> answerFuture =
				questionFuture.thenCompose(question -> googleAnswer(question));

		final CompletableFuture<Integer> httpStatusFuture =
				answerFuture.thenCompose(answer -> postAnswer(answer));

		httpStatusFuture.thenAccept(status -> {
			if (status == HttpStatus.OK.value()) {
				log.debug("OK");
			} else {
				log.error("Wrong status code: {}", status);
			}
		});
	}

	@Test
	public void chained() throws Exception {
		javaQuestions().
				thenCompose(doc -> findMostInterestingQuestion(doc)).
				thenCompose(question -> googleAnswer(question)).
				thenCompose(answer -> postAnswer(answer)).
				thenAccept(status -> {
					if (status == HttpStatus.OK.value()) {
						log.debug("OK");
					} else {
						log.error("Wrong status code: {}", status);
					}
				});
	}

	private CompletableFuture<Document> javaQuestions() {
		return CompletableFuture.supplyAsync(() ->
						client.mostRecentQuestionsAbout("java"),
				executorService
		);
	}

	private CompletableFuture<Question> findMostInterestingQuestion(Document document) {
		return CompletableFuture.completedFuture(new Question());
	}

	private CompletableFuture<String> googleAnswer(Question q) {
		return CompletableFuture.completedFuture("42");
	}

	private CompletableFuture<Integer> postAnswer(String answer) {
		return CompletableFuture.completedFuture(200);
	}

}


================================================
FILE: src/test/java/com/nurkiewicz/reactive/S05_Zip.java
================================================
package com.nurkiewicz.reactive;

import com.nurkiewicz.reactive.util.AbstractFuturesTest;
import org.junit.Test;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.concurrent.CompletableFuture;

public class S05_Zip extends AbstractFuturesTest {

	private static final Logger log = LoggerFactory.getLogger(S05_Zip.class);

	@Test
	public void thenCombine() throws Exception {
		final CompletableFuture<String> java = questions("java");
		final CompletableFuture<String> scala = questions("scala");

		final CompletableFuture<Integer> both = java.
				thenCombine(scala, (String javaTitle, String scalaTitle) ->
						javaTitle.length() + scalaTitle.length()
				);

		both.thenAccept(length -> log.debug("Total length: {}", length));
	}

	@Test
	public void either() throws Exception {
		final CompletableFuture<String> java = questions("java");
		final CompletableFuture<String> scala = questions("scala");

		final CompletableFuture<String> both = java.
				applyToEither(scala, title -> title.toUpperCase());

		both.thenAccept(title -> log.debug("First: {}", title));
	}


}



================================================
FILE: src/test/java/com/nurkiewicz/reactive/S06_AllAny.java
================================================
package com.nurkiewicz.reactive;

import com.nurkiewicz.reactive.util.AbstractFuturesTest;
import org.junit.Test;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.concurrent.CompletableFuture;
import java.util.concurrent.ExecutionException;

public class S06_AllAny extends AbstractFuturesTest {

	private static final Logger log = LoggerFactory.getLogger(S06_AllAny.class);

	@Test
	public void allOf() throws Exception {
		final CompletableFuture<String> java = questions("java");
		final CompletableFuture<String> scala = questions("scala");
		final CompletableFuture<String> clojure = questions("clojure");
		final CompletableFuture<String> groovy = questions("groovy");

		final CompletableFuture<Void> allCompleted =
				CompletableFuture.allOf(
						java, scala, clojure, groovy
				);

		allCompleted.thenRun(() -> {
			try {
				log.debug("Loaded: {}", java.get());
				log.debug("Loaded: {}", scala.get());
				log.debug("Loaded: {}", clojure.get());
				log.debug("Loaded: {}", groovy.get());
			} catch (InterruptedException | ExecutionException e) {
				log.error("", e);
			}
		});
	}

	@Test
	public void anyOf() throws Exception {
		final CompletableFuture<String> java = questions("java");
		final CompletableFuture<String> scala = questions("scala");
		final CompletableFuture<String> clojure = questions("clojure");
		final CompletableFuture<String> groovy = questions("groovy");

		final CompletableFuture<Object> firstCompleted =
				CompletableFuture.anyOf(
						java, scala, clojure, groovy
				);

		firstCompleted.thenAccept((Object result) -> {
			log.debug("First: {}", result);
		});
	}

}



================================================
FILE: src/test/java/com/nurkiewicz/reactive/S07_AsyncCallback.java
================================================
package com.nurkiewicz.reactive;

import com.nurkiewicz.reactive.util.AbstractFuturesTest;
import org.junit.Test;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.concurrent.CompletableFuture;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

public class S07_AsyncCallback extends AbstractFuturesTest {

	private static final Logger log = LoggerFactory.getLogger(S07_AsyncCallback.class);

	protected final ExecutorService poolAlpha =
			Executors.newFixedThreadPool(10, threadFactory("Alpha"));
	protected final ExecutorService poolBeta =
			Executors.newFixedThreadPool(10, threadFactory("Beta"));
	protected final ExecutorService poolGamma =
			Executors.newFixedThreadPool(10, threadFactory("Gamma"));

	@Test
	public void whichThreadInvokesCallbacks() throws Exception {
		final CompletableFuture<String> java = CompletableFuture
				.supplyAsync(
						() -> client.mostRecentQuestionAbout("java"),
						poolAlpha);
		final CompletableFuture<String> scala = CompletableFuture
				.supplyAsync(
						() -> client.mostRecentQuestionAbout("scala"),
						poolBeta);

		final CompletableFuture<String> first = java
				.applyToEither(scala, question -> {
					log.debug("First: {}", question);
					return question.toUpperCase();
				});

		first.thenAccept(q -> log.debug("Sync: {}", q));
		first.thenAcceptAsync(q -> log.debug("Async: {}", q));
		first.thenAcceptAsync(q -> log.debug("Async (pool): {}", q),
				poolGamma);
		first.get();        //block
	}

}



================================================
FILE: src/test/java/com/nurkiewicz/reactive/S08_ErrorHandling.java
================================================
package com.nurkiewicz.reactive;

import com.nurkiewicz.reactive.util.AbstractFuturesTest;
import org.junit.Test;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.concurrent.CompletableFuture;

public class S08_ErrorHandling extends AbstractFuturesTest {

	private static final Logger log = LoggerFactory.getLogger(S08_ErrorHandling.class);

	@Test
	public void exceptionsShortCircuitFuture() throws Exception {
		final CompletableFuture<String> questions = questions("php");

		questions.thenApply(r -> {
			log.debug("Success!");
			return r;
		});
		questions.get();
	}

	@Test
	public void handleExceptions() throws Exception {
		//given
		final CompletableFuture<String> questions = questions("php");

		//when
		final CompletableFuture<String> recovered = questions
				.handle((result, throwable) -> {
					if (throwable != null) {
						return "No PHP today due to: " + throwable;
					} else {
						return result.toUpperCase();
					}
				});

		//then
		log.debug("Handled: {}", recovered.get());
	}

	@Test
	public void shouldHandleExceptionally() throws Exception {
		//given
		final CompletableFuture<String> questions = questions("php");

		//when
		final CompletableFuture<String> recovered = questions
				.exceptionally(throwable -> "Sorry, try again later");

		//then
		log.debug("Done: {}", recovered.get());
	}

}



================================================
FILE: src/test/java/com/nurkiewicz/reactive/S09_Promises.java
================================================
package com.nurkiewicz.reactive;

import com.google.common.util.concurrent.ThreadFactoryBuilder;
import com.nurkiewicz.reactive.util.AbstractFuturesTest;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.time.Duration;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;

public class S09_Promises extends AbstractFuturesTest {

	private static final Logger log = LoggerFactory.getLogger(S09_Promises.class);

	private static final ScheduledExecutorService pool =
			Executors.newScheduledThreadPool(10,
					new ThreadFactoryBuilder()
							.setDaemon(true)
							.setNameFormat("FutureOps-%d")
							.build()
			);

	public static <T> CompletableFuture<T> never() {
		return new CompletableFuture<>();
	}

	public static <T> CompletableFuture<T> timeoutAfter(
			Duration duration) {
		final CompletableFuture<T> promise = new CompletableFuture<>();
		pool.schedule(
				() -> promise.completeExceptionally(new TimeoutException()),
				duration.toMillis(), TimeUnit.MILLISECONDS);
		return promise;
	}

}



================================================
FILE: src/test/java/com/nurkiewicz/reactive/S10_AsyncHttp.java
================================================
package com.nurkiewicz.reactive;

import com.ning.http.client.AsyncCompletionHandler;
import com.ning.http.client.AsyncHttpClient;
import com.ning.http.client.Response;
import com.nurkiewicz.reactive.util.AbstractFuturesTest;
import org.junit.AfterClass;
import org.junit.Test;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.IOException;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.TimeUnit;
import java.util.function.Consumer;

public class S10_AsyncHttp extends AbstractFuturesTest {

	private static final Logger log = LoggerFactory.getLogger(S10_AsyncHttp.class);

	private static final AsyncHttpClient asyncHttpClient = new AsyncHttpClient();

	@AfterClass
	public static void closeClient() {
		asyncHttpClient.close();
	}

	@Test
	public void asyncHttpWithCallbacks() throws Exception {
		loadTag(
				"java",
				response -> log.debug("Got: {}", response),
				throwable -> log.error("Mayday!", throwable)
		);
		TimeUnit.SECONDS.sleep(5);
	}

	public void loadTag(
			String tag,
			Consumer<String> onSuccess,
			Consumer<Throwable> onError) throws IOException {
		asyncHttpClient
				.prepareGet("http://stackoverflow.com/questions/tagged/" + tag)
				.execute(
						new AsyncCompletionHandler<Void>() {

							@Override
							public Void onCompleted(Response response) throws Exception {
								onSuccess.accept(response.getResponseBody());
								return null;
							}

							@Override
							public void onThrowable(Throwable t) {
								onError.accept(t);
							}
						}
				);
	}

	public CompletableFuture<String> loadTag(String tag) throws IOException {
		final CompletableFuture<String> promise = new CompletableFuture<>();
		asyncHttpClient.prepareGet("http://stackoverflow.com/questions/tagged/" + tag).execute(
				new AsyncCompletionHandler<Void>() {

					@Override
					public Void onCompleted(Response response) throws Exception {
						promise.complete(response.getResponseBody());
						return null;
					}

					@Override
					public void onThrowable(Throwable t) {
						promise.completeExceptionally(t);
					}
				}
		);
		return promise;
	}
}



================================================
FILE: src/test/java/com/nurkiewicz/reactive/S11_Cancelling.java
================================================
package com.nurkiewicz.reactive;

import com.nurkiewicz.reactive.util.AbstractFuturesTest;
import com.nurkiewicz.reactive.util.InterruptibleTask;
import org.junit.AfterClass;
import org.junit.BeforeClass;
import org.junit.Ignore;
import org.junit.Test;

import java.util.concurrent.*;

public class S11_Cancelling extends AbstractFuturesTest {

	private static ExecutorService myThreadPool;

	@BeforeClass
	public static void init() {
		myThreadPool = Executors.newFixedThreadPool(10);
	}

	@AfterClass
	public static void close() {
		myThreadPool.shutdownNow();
	}

	@Test
	public void shouldCancelFuture() throws InterruptedException, TimeoutException {
		//given
		InterruptibleTask task = new InterruptibleTask();
		Future future = myThreadPool.submit(task);
		task.blockUntilStarted();

		//when
		future.cancel(true);

		//then
		task.blockUntilInterrupted();
	}

	@Ignore("Fails with CompletableFuture")
	@Test
	public void shouldCancelCompletableFuture() throws InterruptedException, TimeoutException {
		//given
		InterruptibleTask task = new InterruptibleTask();
		CompletableFuture<Void> future = CompletableFuture.supplyAsync(task, myThreadPool);
		task.blockUntilStarted();

		//when
		future.cancel(true);

		//then
		task.blockUntilInterrupted();
	}
}



================================================
FILE: src/test/java/com/nurkiewicz/reactive/S12_RxJava.java
================================================
package com.nurkiewicz.reactive;

import com.nurkiewicz.reactive.util.AbstractFuturesTest;
import com.nurkiewicz.reactive.util.Futures;
import org.junit.Test;
import rx.Observable;

import java.util.List;
import java.util.concurrent.CompletableFuture;

import static java.util.concurrent.TimeUnit.SECONDS;
import static org.assertj.core.api.Assertions.assertThat;

public class S12_RxJava extends AbstractFuturesTest {

	public static final String MSG = "Don't panic";

	@Test
	public void shouldConvertCompletedFutureToCompletedObservable() throws Exception {
		//given
		CompletableFuture<String> future = CompletableFuture.completedFuture("Abc");

		//when
		Observable<String> observable = Futures.toObservable(future);

		//then
		assertThat(observable.toList().toBlocking().single()).containsExactly("Abc");
	}

	@Test
	public void shouldConvertFailedFutureIntoObservableWithFailure() throws Exception {
		//given
		CompletableFuture<String> future = failedFuture(new IllegalStateException(MSG));

		//when
		Observable<String> observable = Futures.toObservable(future);

		//then
		final List<String> result = observable
				.onErrorReturn(Throwable::getMessage)
				.toList()
				.toBlocking()
				.single();
		assertThat(result).containsExactly(MSG);
	}

	@Test
	public void shouldConvertObservableWithManyItemsToFutureOfList() throws Exception {
		//given
		Observable<Integer> observable = Observable.just(1, 2, 3);

		//when
		CompletableFuture<List<Integer>> future = Futures.fromObservable(observable);

		//then
		assertThat(future.get(1, SECONDS)).containsExactly(1, 2, 3);
	}

	@Test
	public void shouldConvertObservableWithSingleItemToFuture() throws Exception {
		//given
		Observable<Integer> observable = Observable.just(1);

		//when
		CompletableFuture<Integer> future = Futures.fromSingleObservable(observable);

		//then
		assertThat(future.get(1, SECONDS)).isEqualTo(1);
	}

	<T> CompletableFuture<T> failedFuture(Exception error) {
		CompletableFuture<T> future = new CompletableFuture<>();
		future.completeExceptionally(error);
		return future;
	}


}



================================================
FILE: src/test/java/com/nurkiewicz/reactive/stackoverflow/ArtificialSleepWrapper.java
================================================
package com.nurkiewicz.reactive.stackoverflow;

import org.jsoup.nodes.Document;

import java.util.Random;
import java.util.concurrent.TimeUnit;

public class ArtificialSleepWrapper implements StackOverflowClient {

	private static final Random RANDOM = new Random();

	private final StackOverflowClient target;

	public ArtificialSleepWrapper(StackOverflowClient target) {
		this.target = target;
	}

	@Override
	public String mostRecentQuestionAbout(String tag) {
		final long start = System.currentTimeMillis();
		final String result = target.mostRecentQuestionAbout(tag);
		artificialSleep(1000 - (System.currentTimeMillis() - start));
		return result;
	}

	@Override
	public Document mostRecentQuestionsAbout(String tag) {
		artificialSleep(1000);
		final long start = System.currentTimeMillis();
		final Document result = target.mostRecentQuestionsAbout(tag);
		artificialSleep(1000 - (System.currentTimeMillis() - start));
		return result;
	}

	protected static void artificialSleep(long expected) {
		try {
			TimeUnit.MILLISECONDS.sleep((long) (expected + RANDOM.nextGaussian() * expected / 2));
		} catch (InterruptedException e) {
			throw new RuntimeException(e);
		}
	}

}


================================================
FILE: src/test/java/com/nurkiewicz/reactive/stackoverflow/FallbackStubClient.java
================================================
package com.nurkiewicz.reactive.stackoverflow;

import com.google.common.base.Throwables;
import org.apache.commons.io.IOUtils;
import org.jsoup.Jsoup;
import org.jsoup.nodes.Document;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.IOException;
import java.net.URL;

public class FallbackStubClient implements StackOverflowClient {

	private static final Logger log = LoggerFactory.getLogger(FallbackStubClient.class);

	private final StackOverflowClient target;

	public FallbackStubClient(StackOverflowClient target) {
		this.target = target;
	}

	@Override
	public String mostRecentQuestionAbout(String tag) {
		try {
			return target.mostRecentQuestionAbout(tag);
		} catch (Exception e) {
			log.warn("Problem retrieving tag {}", tag, e);
			switch(tag) {
				case "java":
					return "How to generate xml report with maven depencency?";
				case "scala":
					return "Update a timestamp SettingKey in an sbt 0.12 task";
				case "groovy":
					return "Reusing Grails variables inside Config.groovy";
				case "clojure":
					return "Merge two comma delimited strings in Clojure";
				default:
					throw e;
			}
		}
	}

	@Override
	public Document mostRecentQuestionsAbout(String tag) {
		try {
			return target.mostRecentQuestionsAbout(tag);
		} catch (Exception e) {
			log.warn("Problem retrieving recent question {}", tag, e);
			return loadStubHtmlFromDisk(tag);
		}
	}

	private Document loadStubHtmlFromDisk(String tag) {
		try {
			final URL resource = getClass().getResource("/" + tag + "-questions.html");
			final String html = IOUtils.toString(resource);
			return Jsoup.parse(html);
		} catch (IOException e) {
			throw Throwables.propagate(e);
		}
	}
}


================================================
FILE: src/test/java/com/nurkiewicz/reactive/stackoverflow/HttpStackOverflowClient.java
================================================
package com.nurkiewicz.reactive.stackoverflow;

import com.google.common.base.Throwables;
import org.jsoup.Jsoup;
import org.jsoup.nodes.Document;

import java.io.IOException;

public class HttpStackOverflowClient implements StackOverflowClient {

	@Override
	public String mostRecentQuestionAbout(String tag) {
		return fetchTitleOnline(tag);
	}

	@Override
	public Document mostRecentQuestionsAbout(String tag) {
		try {
			return Jsoup.
					connect("http://stackoverflow.com/questions/tagged/" + tag).
					get();
		} catch (IOException e) {
			throw Throwables.propagate(e);
		}
	}

	private String fetchTitleOnline(String tag) {
		return mostRecentQuestionsAbout(tag).select("a.question-hyperlink").get(0).text();
	}

}


================================================
FILE: src/test/java/com/nurkiewicz/reactive/stackoverflow/InjectErrorsWrapper.java
================================================
package com.nurkiewicz.reactive.stackoverflow;

import org.jsoup.nodes.Document;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.Arrays;
import java.util.HashSet;
import java.util.Set;

public class InjectErrorsWrapper implements StackOverflowClient {

	private static final Logger log = LoggerFactory.getLogger(InjectErrorsWrapper.class);

	private final StackOverflowClient target;
	private final Set<String> blackList;

	public InjectErrorsWrapper(StackOverflowClient target, String... blackList) {
		this.target = target;
		this.blackList = new HashSet<>(Arrays.asList(blackList));
	}

	@Override
	public String mostRecentQuestionAbout(String tag) {
		throwIfBlackListed(tag);
		return target.mostRecentQuestionAbout(tag);
	}

	@Override
	public Document mostRecentQuestionsAbout(String tag) {
		throwIfBlackListed(tag);
		return target.mostRecentQuestionsAbout(tag);
	}

	private void throwIfBlackListed(String tag) {
		if (blackList.contains(tag)) {
			ArtificialSleepWrapper.artificialSleep(400);
			log.warn("About to throw artifical exception due to: {}", tag);
			throw new IllegalArgumentException("Unsupported " + tag);
		}
	}

}


================================================
FILE: src/test/java/com/nurkiewicz/reactive/stackoverflow/LoadFromStackOverflowTask.java
================================================
package com.nurkiewicz.reactive.stackoverflow;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.concurrent.Callable;

public class LoadFromStackOverflowTask implements Callable<String> {

	private static final Logger log = LoggerFactory.getLogger(LoadFromStackOverflowTask.class);

	private final StackOverflowClient client;
	private final String tag;

	public LoadFromStackOverflowTask(StackOverflowClient client, String tag) {
		this.client = client;
		this.tag = tag;
	}

	@Override
	public String call() throws Exception {
		return client.mostRecentQuestionAbout(tag);
	}
}


================================================
FILE: src/test/java/com/nurkiewicz/reactive/stackoverflow/LoggingWrapper.java
================================================
package com.nurkiewicz.reactive.stackoverflow;

import com.google.common.base.Joiner;
import com.google.common.base.Splitter;
import com.google.common.collect.Iterables;
import org.jsoup.nodes.Document;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class LoggingWrapper implements StackOverflowClient {

	private static final Logger log = LoggerFactory.getLogger(LoggingWrapper.class);

	private final StackOverflowClient target;

	public LoggingWrapper(StackOverflowClient target) {
		this.target = target;
	}

	@Override
	public String mostRecentQuestionAbout(String tag) {
		log.debug("Entering mostRecentQuestionAbout({})", tag);
		final String title = target.mostRecentQuestionAbout(tag);
		log.debug("Leaving mostRecentQuestionAbout({}): {}", tag, title);
		return title;
	}

	@Override
	public Document mostRecentQuestionsAbout(String tag) {
		log.debug("Entering mostRecentQuestionsAbout({})", tag);
		final Document document = target.mostRecentQuestionsAbout(tag);
		if (log.isTraceEnabled()) {
			log.trace("Leaving mostRecentQuestionsAbout({}): {}", tag, htmlExcerpt(document));
		}
		return document;
	}

	private String htmlExcerpt(Document document) {
		final String outerHtml = document.outerHtml();
		final Iterable<String> lines = Splitter.onPattern("\r?\n").split(outerHtml);
		final Iterable<String> firstLines = Iterables.limit(lines, 4);
		final String excerpt = Joiner.on(' ').join(firstLines);
		final int remainingBytes = Math.max(outerHtml.length() - excerpt.length(), 0);
		return excerpt + " [...and " + remainingBytes + " chars]";
	}
}


================================================
FILE: src/test/java/com/nurkiewicz/reactive/stackoverflow/Question.java
================================================
package com.nurkiewicz.reactive.stackoverflow;

public class Question {
}

================================================
FILE: src/test/java/com/nurkiewicz/reactive/stackoverflow/StackOverflowClient.java
================================================
package com.nurkiewicz.reactive.stackoverflow;

import org.jsoup.nodes.Document;

public interface StackOverflowClient {

	String mostRecentQuestionAbout(String tag);
	Document mostRecentQuestionsAbout(String tag);

}


================================================
FILE: src/test/java/com/nurkiewicz/reactive/util/AbstractFuturesTest.java
================================================
package com.nurkiewicz.reactive.util;

import com.google.common.util.concurrent.ThreadFactoryBuilder;
import com.nurkiewicz.reactive.stackoverflow.*;
import org.junit.After;
import org.junit.Before;
import org.junit.Rule;
import org.junit.rules.TestName;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.concurrent.*;

public class AbstractFuturesTest {

	private static final Logger log = LoggerFactory.getLogger(AbstractFuturesTest.class);

	protected final ExecutorService executorService = Executors.newFixedThreadPool(10, threadFactory("Custom"));

	@Rule
	public TestName testName = new TestName();

	protected ThreadFactory threadFactory(String nameFormat) {
		return new ThreadFactoryBuilder().setNameFormat(nameFormat + "-%d").build();
	}

	protected final StackOverflowClient client = new FallbackStubClient(
			new InjectErrorsWrapper(
					new LoggingWrapper(
							new ArtificialSleepWrapper(
									new HttpStackOverflowClient()
							)
					), "php"
			)
	);

	@Before
	public void logTestStart() {
		log.debug("Starting: {}", testName.getMethodName());
	}

	@After
	public void stopPool() throws InterruptedException {
		executorService.shutdown();
		executorService.awaitTermination(10, TimeUnit.SECONDS);
	}

	protected CompletableFuture<String> questions(String tag) {
		return CompletableFuture.supplyAsync(() ->
				client.mostRecentQuestionAbout(tag),
				executorService);
	}

}


================================================
FILE: src/test/java/com/nurkiewicz/reactive/util/Futures.java
================================================
package com.nurkiewicz.reactive.util;

import rx.Observable;

import java.util.List;
import java.util.concurrent.CompletableFuture;

public class Futures {

	public static <T> CompletableFuture<T> fromSingleObservable(Observable<T> observable) {
		final CompletableFuture<T> future = new CompletableFuture<>();
		observable
				.doOnError(future::completeExceptionally)
				.single()
				.forEach(future::complete);
		return future;
	}

	public static <T> CompletableFuture<List<T>> fromObservable(Observable<T> observable) {
		final CompletableFuture<List<T>> future = new CompletableFuture<>();
		observable
				.doOnError(future::completeExceptionally)
				.toList()
				.forEach(future::complete);
		return future;
	}

	public static <T> Observable<T> toObservable(CompletableFuture<T> future) {
		return Observable.create(subscriber ->
				future.whenComplete((result, error) -> {
					if (error != null) {
						subscriber.onError(error);
					} else {
						subscriber.onNext(result);
						subscriber.onCompleted();
					}
				}));
	}

}


================================================
FILE: src/test/java/com/nurkiewicz/reactive/util/InterruptibleTask.java
================================================
package com.nurkiewicz.reactive.util;

import java.util.concurrent.CountDownLatch;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;
import java.util.function.Supplier;

public class InterruptibleTask implements Runnable, Supplier<Void> {

	private final CountDownLatch started = new CountDownLatch(1);
	private final CountDownLatch interrupted = new CountDownLatch(1);

	@Override
	public Void get() {
		run();
		return null;
	}

	@Override
	public void run() {
		started.countDown();
		try {
			Thread.sleep(10_000);
		} catch (InterruptedException ignored) {
			interrupted.countDown();
		}
	}

	public void blockUntilStarted() throws InterruptedException {
		started.await();
	}

	public void blockUntilInterrupted() throws InterruptedException, TimeoutException {
		if (!interrupted.await(1, TimeUnit.SECONDS)) {
			throw new TimeoutException("Not interrupted within 1 second");
		}
	}
}

================================================
FILE: src/test/resources/clojure-questions.html
================================================
<!DOCTYPE html>
<html>
<head>

    <title>Newest &#39;clojure&#39; Questions - Stack Overflow</title>
    <link rel="shortcut icon" href="//cdn.sstatic.net/stackoverflow/img/favicon.ico?v=038622610830">
    <link rel="apple-touch-icon image_src" href="//cdn.sstatic.net/stackoverflow/img/apple-touch-icon.png?v=fd7230a85918">
    <link rel="search" type="application/opensearchdescription+xml" title="Stack Overflow" href="/opensearch.xml">
    <meta name="twitter:card" content="summary">
    <meta name="twitter:domain" content="stackoverflow.com"/>
    <meta name="og:type" content="website" />
    <meta name="og:image" content="http://cdn.sstatic.net/stackoverflow/img/apple-touch-icon@2.png?v=fde65a5a78c6"/>
    <meta name="og:title" content="Newest &amp;#39;clojure&amp;#39; Questions" />
    <meta name="og:description" content="Q&amp;A for professional and enthusiast programmers" />
    <meta name="og:url" content="http://stackoverflow.com/questions/tagged/clojure"/>



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        <h3><a href="/questions/23428066/secure-web-sockets-with-clojure" class="question-hyperlink">Secure web sockets with Clojure [on hold]</a></h3>
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            Can anybody tell me how to implement secure websockets with Clojure (HttpKit)?

            Thanks

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        <div class="tags t-https t-clojure t-websocket">
            <a href="/questions/tagged/https" class="post-tag" title="show questions tagged &#39;https&#39;" rel="tag">https</a> <a href="/questions/tagged/clojure" class="post-tag" title="show questions tagged &#39;clojure&#39;" rel="tag">clojure</a> <a href="/questions/tagged/websocket" class="post-tag" title="show questions tagged &#39;websocket&#39;" rel="tag">websocket</a>

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                    asked <span title="2014-05-02 12:20:54Z" class="relativetime">3 hours ago</span>
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                    <a href="/users/721597/harikrishnan"><div><img src="https://www.gravatar.com/avatar/ea871c2fe4a4a4302034720f37d8b268?s=32&d=identicon&r=PG" alt="" width="32" height="32"></div></a>
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        <h3><a href="/questions/23427457/clojure-using-agents-slows-down-execution-too-much" class="question-hyperlink">Clojure - Using agents slows down execution too much</a></h3>
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            I am writing a benchmark for a program in Clojure. I have n threads accessing a cache at the same time. Each thread will access the cache x times. Each request should be logged inside a file.

            To this ...
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            <a href="/questions/tagged/multithreading" class="post-tag" title="show questions tagged &#39;multithreading&#39;" rel="tag">multithreading</a> <a href="/questions/tagged/clojure" class="post-tag" title="show questions tagged &#39;clojure&#39;" rel="tag">clojure</a> <a href="/questions/tagged/agents" class="post-tag" title="show questions tagged &#39;agents&#39;" rel="tag">agents</a>

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                    asked <span title="2014-05-02 11:49:12Z" class="relativetime">4 hours ago</span>
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                    <a href="/users/1225786/christophe-de-troyer"><div><img src="https://www.gravatar.com/avatar/3c2d965b0bfd06fc03f7d0d193812a0f?s=32&d=identicon&r=PG" alt="" width="32" height="32"></div></a>
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                    <a href="/users/1225786/christophe-de-troyer">Christophe De Troyer</a><br>
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            33 views
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        <h3><a href="/questions/23426284/merge-two-comma-delimited-strings-in-clojure" class="question-hyperlink">Merge two comma delimited strings in Clojure</a></h3>
        <div class="excerpt">
            I have two comma-delimited strings as below:

            stringA "a,b,c,d"
            stringB "w,x,y,z"


            How can I merge the strings as below in clojure:

            stringResult "aw,bx,cy,dz"


            Note: The comma-delimited values are ...
        </div>
        <div class="tags t-string t-clojure">
            <a href="/questions/tagged/string" class="post-tag" title="show questions tagged &#39;string&#39;" rel="tag">string</a> <a href="/questions/tagged/clojure" class="post-tag" title="show questions tagged &#39;clojure&#39;" rel="tag">clojure</a>

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                    asked <span title="2014-05-02 10:47:09Z" class="relativetime">5 hours ago</span>
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                    <a href="/users/1382680/rajul-gupta">Rajul Gupta</a><br>
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        <h3><a href="/questions/23422781/how-to-set-a-timeout-on-a-hystrix-command-in-clojure" class="question-hyperlink">How to set a timeout on a Hystrix command in Clojure?</a></h3>
        <div class="excerpt">
            I'm learning about Hystrix and Clojure and don't understand how to (properly) set a timeout on a Hystrix command in Clojure.

            I searched StackOverflow and the web more generally. I looked at Hystrix's ...
        </div>
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            <a href="/questions/tagged/clojure" class="post-tag" title="show questions tagged &#39;clojure&#39;" rel="tag">clojure</a> <a href="/questions/tagged/timeout" class="post-tag" title="show questions tagged &#39;timeout&#39;" rel="tag">timeout</a>

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                    asked <span title="2014-05-02 07:14:52Z" class="relativetime">8 hours ago</span>
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                    <a href="/users/3554636/oliver-baier">Oliver Baier</a><br>
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            16 views
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        <h3><a href="/questions/23420947/use-of-other-protocol-method-in-extend-type" class="question-hyperlink">Use of other protocol method in extend-type</a></h3>
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            I'm building a graph editor with Piccolo2D and want to implement Loom's Graph protocol. However I run into problem

            Unable to resolve symbol: out-edges in this context


            What really confusing is that ...
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            <a href="/questions/tagged/clojure" class="post-tag" title="show questions tagged &#39;clojure&#39;" rel="tag">clojure</a>

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                    asked <span title="2014-05-02 04:50:22Z" class="relativetime">11 hours ago</span>
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                    <a href="/users/401539/tungd">tungd</a><br>
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            29 views
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    <div class="summary">
        <h3><a href="/questions/23420076/how-to-write-a-macro-used-in-cond-in-clojure" class="question-hyperlink">How to write a macro used in cond in clojure?</a></h3>
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            I have the following macro to ensure the data containing specific keys.

            (defmacro with-correct-format
            [data &amp; body]
            `(cond
            (nil? ~data) (throw (IllegalArgumentException.
            ...
        </div>
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                    asked <span title="2014-05-02 03:00:57Z" class="relativetime">13 hours ago</span>
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                    <a href="/users/1042900/dang-fan">DANG Fan</a><br>
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            18 views
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        <h3><a href="/questions/23419786/classnotfoundexception-when-importing-record-from-other-namespace" class="question-hyperlink">ClassNotFoundException when importing record from other namespace</a></h3>
        <div class="excerpt">
            I have following files:

            src/my_proj/myns.clj:

            (ns my-proj.myns)
            (defrecord MyRecord  [a b c])


            test/my_proj/myns_test.clj:

            (ns my-proj.myns-test
            (:require [clojure.test :refer :all]
            ...
        </div>
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            <a href="/questions/tagged/clojure" class="post-tag" title="show questions tagged &#39;clojure&#39;" rel="tag">clojure</a> <a href="/questions/tagged/namespaces" class="post-tag" title="show questions tagged &#39;namespaces&#39;" rel="tag">namespaces</a> <a href="/questions/tagged/leiningen" class="post-tag" title="show questions tagged &#39;leiningen&#39;" rel="tag">leiningen</a>

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                    asked <span title="2014-05-02 02:21:38Z" class="relativetime">13 hours ago</span>
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                    <a href="/users/1936950/viktor-k">Viktor K.</a><br>
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            27 views
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        <h3><a href="/questions/23417175/getting-modulus-from-seq-stream" class="question-hyperlink">Getting modulus from seq-&gt;stream</a></h3>
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            The code below draws me the sine wave throughout the screen, and beyond.
            However, I want that x never exceeds (width). At that point, the window should be cleared, and the wave should be drawn again, ...
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            <a href="/questions/tagged/clojure" class="post-tag" title="show questions tagged &#39;clojure&#39;" rel="tag">clojure</a> <a href="/questions/tagged/quil" class="post-tag" title="show questions tagged &#39;quil&#39;" rel="tag">quil</a>

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                    asked <span title="2014-05-01 21:43:16Z" class="relativetime">18 hours ago</span>
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                    <a href="/users/664404/barerd">barerd</a><br>
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            61 views
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        <h3><a href="/questions/23415815/more-functional-way-to-do-this" class="question-hyperlink">More functional way to do this?</a></h3>
        <div class="excerpt">
            This post of mine discusses Thomson's paradox, and simulates it in Clojure.
            The state function returns the state of the lamp at time = t.

            (defn thomsons-lamp []
            (iterate (fn [[onoff dur]]
            ...
        </div>
        <div class="tags t-clojure t-functional-programming">
            <a href="/questions/tagged/clojure" class="post-tag" title="show questions tagged &#39;clojure&#39;" rel="tag">clojure</a> <a href="/questions/tagged/functional-programming" class="post-tag" title="show questions tagged &#39;functional-programming&#39;" rel="tag">functional-programming</a>

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                    asked <span title="2014-05-01 20:13:59Z" class="relativetime">19 hours ago</span>
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        <h3><a href="/questions/23411955/casting-an-arrayseq-as-an-ifn" class="question-hyperlink">Casting an ArraySeq as an IFn</a></h3>
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            Elementary question here.. I am a little confused.

            (((fn [_ &amp; y] y) 'blah +) 3 4)


            will result in the error:


            "java.lang.ClassCastException: clojure.lang.ArraySeq cannot be cast to ...
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        <h3><a href="/questions/23410859/how-to-sort-map-based-on-keys" class="question-hyperlink">how to sort map based on keys</a></h3>
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            I have the following map:

            MyVals {12 -3, 24 -9, 36 -777, 48 -3037, 180 0, 360 0, 240 0, 120 0, 0 0, 144 0, 3 0, 6 -1, 9 -1, 108 0, 60 0, 72 0, 84 0, 96 0}


            I am removing zero values then I need to ...
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        <h3><a href="/questions/23409130/clojure-local-maven-repo-with-jni-dependency" class="question-hyperlink">Clojure local maven repo with JNI dependency</a></h3>
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            I am trying to create a local Maven repository for my Clojure/leiningen project, as for instance described here:

            Use Leiningen With Local M2 Repository

            I have also found out that more recent ...
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            <a href="/questions/tagged/java" class="post-tag" title="show questions tagged &#39;java&#39;" rel="tag">java</a> <a href="/questions/tagged/maven" class="post-tag" title="show questions tagged &#39;maven&#39;" rel="tag">maven</a> <a href="/questions/tagged/clojure" class="post-tag" title="show questions tagged &#39;clojure&#39;" rel="tag">clojure</a> <a href="/questions/tagged/jni" class="post-tag" title="show questions tagged &#39;jni&#39;" rel="tag">jni</a> <a href="/questions/tagged/dependencies" class="post-tag" title="show questions tagged &#39;dependencies&#39;" rel="tag">dependencies</a>

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        <h3><a href="/questions/23407616/how-to-expand-the-classname-staticfield-macro-syntax" class="question-hyperlink">How to expand the `Classname/staticField` macro syntax</a></h3>
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            From the Clojure docs, this is how to access a static field of a Java class:

            Classname/staticField

            Math/PI
            -&gt; 3.141592653589793


            And this is the expansion:


            The expansions are as follows:

            ...
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        <h3><a href="/questions/23405852/clojure-printing-lazy-sequence" class="question-hyperlink">Clojure printing lazy sequence</a></h3>
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            I'm trying to print out my binary tree but Clojure is giving me a hard time printing out the sequences properly.

            So, I have a list of nodes '(1 2 3) for example.

            In each iteration I want to print ...
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        <h3><a href="/questions/23405699/how-to-package-up-a-leiningen-project-for-recompilation-with-all-the-libraries-i" class="question-hyperlink">How to package up a leiningen project for recompilation with all the libraries included? [for users without an internet connection]</a></h3>
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            I'm giving a Clojure workshop and I want people to be able to modify and recompile the Clojure project. The challenge is that they won't have internet connections - so I need to give them the project ...
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            What is the best way to trim field value in domain?

            My suggestion is to use beforeSave(), but would work something like this?

            class Book {

            String name = name?.trim()

            }


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            In my grails integration test, how do I get the the currently executing test name?

            I want to do this for logging purposes.

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            In my Config.groovy I have:

            // Lots of other stuff up here...

            environments {
            development {
            myapp.port = 7500
            }
            production {
            myapp.port = 7600
            }
            }

            fizz {
            buzz {
            ...
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        <h3><a href="/questions/23427266/groovy-script-run-cli-command-win-xp" class="question-hyperlink">groovy script + run CLI command + WIN XP</a></h3>
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            I have the following command in my groovy script

            println "cmd /c remove_files.bat".execute().text


            Groovy runs the BAT file - remove_files.bat ,  but the BAT file stop on the question:

            do you ...
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                    asked <span title="2014-05-02 11:39:36Z" class="relativetime">4 hours ago</span>
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            15 views
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        <h3><a href="/questions/23425495/define-a-method-in-dsld-parameter-types" class="question-hyperlink">Define a method in DSLD (Parameter types)</a></h3>
        <div class="excerpt">
            I already have defined a DSL in Groovy. Now I'm working on the Eclipse integration so that I have auto completion and other fancy stuff.

            This doesn't work:

            method name:"myMethod", params : [param1: ...
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        <div class="tags t-eclipse t-groovy t-dsl t-dsld">
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                    asked <span title="2014-05-02 10:03:42Z" class="relativetime">6 hours ago</span>
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            22 views
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        <h3><a href="/questions/23425096/parsing-wikipedia-xml-dump-in-groovy" class="question-hyperlink">Parsing wikipedia xml dump in Groovy</a></h3>
        <div class="excerpt">
            recently I wanted to work on wikipedia data. In that case I downloaded its en-lang XML dump.
            It was over 44GB. I thought I would parse it with XmlSlurper that, according to documentation, is good ...
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        <div class="tags t-xml t-groovy">
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                    asked <span title="2014-05-02 09:41:26Z" class="relativetime">6 hours ago</span>
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                    <a href="/users/1131019/hexin">hexin</a><br>
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            25 views
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        <h3><a href="/questions/23424861/pagination-on-a-arraylist" class="question-hyperlink">Pagination on a ArrayList</a></h3>
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            There are a lot of possibilities to make pagination with domain classes, but what about existing ArrayList of objects?

            Is it possible?

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                    asked <span title="2014-05-02 09:27:55Z" class="relativetime">6 hours ago</span>
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            8 views
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        <h3><a href="/questions/23422999/groovy-execute-process-hangs" class="question-hyperlink">Groovy execute process hangs</a></h3>
        <div class="excerpt">
            In a groovy script I execute an application on linux and windows with:

            def proc = command.execute()
            proc.consumeProcessOutput( System.out, System.err)
            println "here"
            proc.waitFor()
            println ...
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            22 views
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    <div class="summary">
        <h3><a href="/questions/23422603/issue-in-saving-the-list-in-mongdb" class="question-hyperlink">Issue in saving the list in mongdb</a></h3>
        <div class="excerpt">
            Domain Class:
            class Questionairre {
            static hasMany = [Questions: String]
            }

            Controller Class:

            Map CONFIG_BOOK_COLUMN_MAP = [
            sheet:'Sheet1',
            startRow: 1,
            columnMap:  [
            ...
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                    asked <span title="2014-05-02 07:03:43Z" class="relativetime">9 hours ago</span>
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            31 views
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    <div class="summary">
        <h3><a href="/questions/23419237/how-to-test-that-a-created-value-is-unique" class="question-hyperlink">How to test that a created value is unique?</a></h3>
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            In my Java class I have a method that creates an object and implements certain logic to assign random values to some of its variables, using one static instance of Random (static Random rn = new ...
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            23 views
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    <div class="summary">
        <h3><a href="/questions/23418386/how-can-a-grails-plugin-modify-the-apps-default-mappings-constraints-config" class="question-hyperlink">How can a Grails plugin modify the app&#39;s default mappings/constraints config?</a></h3>
        <div class="excerpt">
            I'm creating a Grails plugin which will modify the value of the following config property:

            grails.gorm.default.constraints


            The problem is that by the time my plugin descriptor starts running ...
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        <div class="tags t-grails t-plugins t-groovy t-grails-plugin t-grails-config">
            <a href="/questions/tagged/grails" class="post-tag" title="show questions tagged &#39;grails&#39;" rel="tag">grails</a> <a href="/questions/tagged/plugins" class="post-tag" title="show questions tagged &#39;plugins&#39;" rel="tag">plugins</a> <a href="/questions/tagged/groovy" class="post-tag" title="show questions tagged &#39;groovy&#39;" rel="tag">groovy</a> <a href="/questions/tagged/grails-plugin" class="post-tag" title="show questions tagged &#39;grails-plugin&#39;" rel="tag">grails-plugin</a> <a href="/questions/tagged/grails-config" class="post-tag" title="show questions tagged &#39;grails-config&#39;" rel="tag">grails-config</a>

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            12 views
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        <h3><a href="/questions/23417367/soap-ui-split-http-response-header-and-transfer-to-property" class="question-hyperlink">SOAP UI - Split HTTP Response Header and transfer to property</a></h3>
        <div class="excerpt">
            I am obtaining the following response to a HTTP Request in SOAP UI

            TTP/1.1 201 Created
            X-Content-Type-Options: nosniff
            X-XSS-Protection: 1; mode=block
            Cache-Control: no-cache, no-store, max-age=0, ...
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            29 views
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        <h3><a href="/questions/23413668/how-to-run-expect-from-groovy-script" class="question-hyperlink">how to run expect from groovy script</a></h3>
        <div class="excerpt">
            First I am very new in groovy

            I am trying to learn how groovy can work with expect

            so I take this groovy script “nslookup in interactive mode to test a DNS server”

            from the link below

            ...
        </div>
        <div class="tags t-windows t-groovy t-expect">
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                    asked <span title="2014-05-01 18:05:05Z" class="relativetime">22 hours ago</span>
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        <h3><a href="/questions/23412992/pass-a-list-as-an-argument-to-groovy-buildersupport-createnode" class="question-hyperlink">Pass a list as an argument to Groovy BuilderSupport createNode</a></h3>
        <div class="excerpt">
            I have a Groovy class that creates another classes dynamically:

            package javainterop3

            import groovy.lang.Closure;
            import groovy.lang.GroovyClassLoader;

            class DynamicClass {

            GroovyClassLoader ...
        </div>
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                    asked <span title="2014-05-01 17:27:11Z" class="relativetime">22 hours ago</span>
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                    <a href="/users/3284680/uros-calakovic">uros calakovic</a><br>
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        <h3><a href="/questions/23412359/groovy-how-to-call-a-restful-web-service-with-post-method-if-i-have-endpoint" class="question-hyperlink">Groovy: How to call a restful web service with post method , if I have endpoint, path and xml as argument</a></h3>
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            I have tried hard to access the service but couldn't get. The uri is a secure one.

            a end point/URI https://www.localhost:8080/test

            Method Path: login/new session
            and XML argument:
            123xxx

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        <h3><a href="/questions/23431760/why-dont-common-map-implementations-cache-the-result-of-map-containskey-for-m" class="question-hyperlink">Why don&#39;t common Map implementations cache the result of Map.containsKey() for Map.get()</a></h3>
        <div class="excerpt">
            A common pattern with a map is to check if a key exists and then act on the value only if it does, consider:

            if(!map.containsKey(key)) {
            map.put(key, new DefaultValue());
            }
            return map.get(key);


            ...
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                    asked <span title="2014-05-02 15:31:48Z" class="relativetime">1 min ago</span>
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        <h3><a href="/questions/23431743/java-lang-classnotfoundexception-org-hibernate-hibernateexception-for-hibernate" class="question-hyperlink">java.lang.ClassNotFoundException: org.hibernate.HibernateException for hibernate 4</a></h3>
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            I'm trying to set up a web application with tomcat 7.0, java6 and hibernate 4.

            Basically, you can say I have the same problem as in this thread: java.lang.ClassNotFoundException: ...
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                    asked <span title="2014-05-02 15:30:44Z" class="relativetime">2 mins ago</span>
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        <h3><a href="/questions/23431700/how-to-generate-xml-report-with-maven-depencency" class="question-hyperlink">How to generate xml report with maven depencency?</a></h3>
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            I would like to use the command mvn dependency:analyze-report to generate xml report.
            Actually the report generated is html format.
            The plug-in declaration :

            &lt;plugin&gt;
            ...
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        <h3><a href="/questions/23431676/how-to-test-handler-callbacks-from-a-service-in-an-android-junit-test" class="question-hyperlink">How to test Handler callbacks from a Service in an Android JUnit Test?</a></h3>
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            I want to test the following (standard?) scenario


            An activity uses a Service object to do some stuff.
            The Service is bind to the activity with bindService(..).
            The service itself allows access via ...
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                    asked <span title="2014-05-02 15:27:06Z" class="relativetime">6 mins ago</span>
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        <h3><a href="/questions/23431664/what-does-the-regex-0-9-do" class="question-hyperlink">What does the regex &ldquo;[+0-9-&#39;.&#39;]+$&rdquo; do? [on hold]</a></h3>
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            Can someone explain to me what telreg will contain after the assignement ?

            String telReg = "[+0-9-'.']+$";

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                    asked <span title="2014-05-02 15:26:08Z" class="relativetime">7 mins ago</span>
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            25 views
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        <h3><a href="/questions/23431612/expanding-a-variable-within-double-quotes-in-java" class="question-hyperlink">Expanding a variable within Double Quotes in Java</a></h3>
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            I have a Java Application program that runs various Unix commands while the main application is executing.

            public static void shellExec(){
            try{

            System.out.println("Entering into the test ...
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                    asked <span title="2014-05-02 15:23:09Z" class="relativetime">10 mins ago</span>
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                    <a href="/users/2046382/smruti">Smruti</a><br>
                    <span class="reputation-score" title="reputation score " dir="ltr">15</span><span title="5 bronze badges"><span class="badge3"></span><span class="badgecount">5</span></span>
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            17 views
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        <h3><a href="/questions/23431603/how-to-prevent-java-generics-forcing-duplicate-code" class="question-hyperlink">How to prevent Java Generics forcing duplicate code?</a></h3>
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            I'm trying to write an AnimalGroup factory class that returns an instance which contains various different types of Animal. Unfortunately i'm being forced to duplicate code due to what seems like Java ...
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                    asked <span title="2014-05-02 15:22:47Z" class="relativetime">10 mins ago</span>
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                    <a href="/users/1169248/ben">Ben</a><br>
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            23 views
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        <h3><a href="/questions/23431596/java-cannot-compile-when-using-extend" class="question-hyperlink">Java cannot compile when using &ldquo;extend&rdquo;</a></h3>
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            i m trying to compile a .java file and it always give an error in "extend class".I can compile other .java without extend in the code.Also i can compile the file with the extend on another computer.
            I ...
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        <div class="tags t-java t-compilation t-extend">
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                    asked <span title="2014-05-02 15:22:22Z" class="relativetime">11 mins ago</span>
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        <h3><a href="/questions/23431535/does-thread-sleep-reduce-memory-issues-with-reading-and-saving-a-big-file" class="question-hyperlink">Does Thread.sleep reduce memory issues with reading and saving a big file</a></h3>
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            I am running a utility class as a java application. The class read a csv file with 5 million records and tries to save about 125k records in database. Half way through i got heap space error. Full ...
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            <a href="/questions/tagged/java" class="post-tag" title="show questions tagged &#39;java&#39;" rel="tag">java</a> <a href="/questions/tagged/multithreading" class="post-tag" title="show questions tagged &#39;multithreading&#39;" rel="tag">multithreading</a> <a href="/questions/tagged/spring" class="post-tag" title="show questions tagged &#39;spring&#39;" rel="tag">spring</a> <a href="/questions/tagged/jpa" class="post-tag" title="show questions tagged &#39;jpa&#39;" rel="tag">jpa</a> <a href="/questions/tagged/spring-data" class="post-tag" title="show questions tagged &#39;spring-data&#39;" rel="tag">spring-data</a>

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                    asked <span title="2014-05-02 15:19:05Z" class="relativetime">14 mins ago</span>
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        <h3><a href="/questions/23431513/paypal-merchant-java-sdk-how-to-get-recurring-payment-amount-to-show-up-on-payp" class="question-hyperlink">Paypal Merchant Java SDK: How to get Recurring Payment amount to show up on Paypal?</a></h3>
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            I'm up and running with the Paypal Merchant SDK for Java.  I followed the instructions here: ...
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            I am implementing an AVLTree class using Java, and I have met some mysterious problems:

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        <h3><a href="/questions/23431506/ria-java-banned-everywhere" class="question-hyperlink">RIA - Java banned everywhere</a></h3>
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            I am considering Java as a platform for development some rich internet application. As a developer I am pretty satisfied by abilities Java provides. But there is a problem - my application should be ...
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        <h3><a href="/questions/23431420/how-to-visualize-a-picture-on-the-ui-using-primeface" class="question-hyperlink">How to visualize a picture on the UI using Primeface</a></h3>
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            I want to make a toggleable form, where each agency from my list will be in a different toggleable panel which will contain photo + additional info. Toggleable panels work perfect. I successfully take ...
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        <h3><a href="/questions/23431412/explain-in-plain-english-algorithm-to-find-a-path-on-graph-using-hadoop" class="question-hyperlink">Explain in plain english algorithm to find a path on graph using hadoop [on hold]</a></h3>
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            I have a problem that involves finding path of a particular length on directed graph using hadoop and I found myself not been able to invent a solution.

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        <h3><a href="/questions/23431387/concatenate-string-from-bufferedreader-and-pass-to-ui-thread" class="question-hyperlink">Concatenate String from BufferedReader and Pass to UI Thread</a></h3>
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            First off, this is my first Java project! Take a look at the method below. My goal is to receive multi-line text (actually xml in a wrapper) from a socket connection. I am trying to read each line and ...
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        <h3><a href="/questions/23431760/why-dont-common-map-implementations-cache-the-result-of-map-containskey-for-m" class="question-hyperlink">Why don&#39;t common Map implementations cache the result of Map.containsKey() for Map.get()</a></h3>
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            A common pattern with a map is to check if a key exists and then act on the value only if it does, consider:

            if(!map.containsKey(key)) {
            map.put(key, new DefaultValue());
            }
            return map.get(key);


            ...
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        <h3><a href="/questions/23431743/java-lang-classnotfoundexception-org-hibernate-hibernateexception-for-hibernate" class="question-hyperlink">java.lang.ClassNotFoundException: org.hibernate.HibernateException for hibernate 4</a></h3>
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            I'm trying to set up a web application with tomcat 7.0, java6 and hibernate 4.

            Basically, you can say I have the same problem as in this thread: java.lang.ClassNotFoundException: ...
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                    asked <span title="2014-05-02 15:30:44Z" class="relativetime">2 mins ago</span>
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            I would like to use the command mvn dependency:analyze-report to generate xml report.
            Actually the report generated is html format.
            The plug-in declaration :

            &lt;plugin&gt;
            ...
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        <h3><a href="/questions/23431676/how-to-test-handler-callbacks-from-a-service-in-an-android-junit-test" class="question-hyperlink">How to test Handler callbacks from a Service in an Android JUnit Test?</a></h3>
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            I want to test the following (standard?) scenario


            An activity uses a Service object to do some stuff.
            The Service is bind to the activity with bindService(..).
            The service itself allows access via ...
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                    asked <span title="2014-05-02 15:27:06Z" class="relativetime">6 mins ago</span>
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        <h3><a href="/questions/23431664/what-does-the-regex-0-9-do" class="question-hyperlink">What does the regex &ldquo;[+0-9-&#39;.&#39;]+$&rdquo; do? [on hold]</a></h3>
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            Can someone explain to me what telreg will contain after the assignement ?

            String telReg = "[+0-9-'.']+$";

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        <h3><a href="/questions/23431612/expanding-a-variable-within-double-quotes-in-java" class="question-hyperlink">Expanding a variable within Double Quotes in Java</a></h3>
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            I have a Java Application program that runs various Unix commands while the main application is executing.

            public static void shellExec(){
            try{

            System.out.println("Entering into the test ...
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        <h3><a href="/questions/23431603/how-to-prevent-java-generics-forcing-duplicate-code" class="question-hyperlink">How to prevent Java Generics forcing duplicate code?</a></h3>
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            I'm trying to write an AnimalGroup factory class that returns an instance which contains various different types of Animal. Unfortunately i'm being forced to duplicate code due to what seems like Java ...
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                    asked <span title="2014-05-02 15:22:47Z" class="relativetime">10 mins ago</span>
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                    <a href="/users/1169248/ben">Ben</a><br>
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        <h3><a href="/questions/23431596/java-cannot-compile-when-using-extend" class="question-hyperlink">Java cannot compile when using &ldquo;extend&rdquo;</a></h3>
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            i m trying to compile a .java file and it always give an error in "extend class".I can compile other .java without extend in the code.Also i can compile the file with the extend on another computer.
            I ...
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                    asked <span title="2014-05-02 15:22:22Z" class="relativetime">11 mins ago</span>
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        <h3><a href="/questions/23431535/does-thread-sleep-reduce-memory-issues-with-reading-and-saving-a-big-file" class="question-hyperlink">Does Thread.sleep reduce memory issues with reading and saving a big file</a></h3>
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            I am running a utility class as a java application. The class read a csv file with 5 million records and tries to save about 125k records in database. Half way through i got heap space error. Full ...
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        <h3><a href="/questions/23431513/paypal-merchant-java-sdk-how-to-get-recurring-payment-amount-to-show-up-on-payp" class="question-hyperlink">Paypal Merchant Java SDK: How to get Recurring Payment amount to show up on Paypal?</a></h3>
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            I'm up and running with the Paypal Merchant SDK for Java.  I followed the instructions here: ...
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            <a href="/questions/tagged/java" class="post-tag" title="show questions tagged &#39;java&#39;" rel="tag">java</a> <a href="/questions/tagged/paypal" class="post-tag" title="show questions tagged &#39;paypal&#39;" rel="tag"><img src="http://i.stack.imgur.com/ZVGdM.png" height="16" width="18" alt="" class="sponsor-tag-img">paypal</a> <a href="/questions/tagged/paypal-sandbox" class="post-tag" title="show questions tagged &#39;paypal-sandbox&#39;" rel="tag">paypal-sandbox</a> <a href="/questions/tagged/paypalmerchantsdk" class="post-tag" title="show questions tagged &#39;paypalmerchantsdk&#39;" rel="tag">paypalmerchantsdk</a>

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        <h3><a href="/questions/23431511/java-avl-tree-cannot-rotate-right-cannot-find-the-reason" class="question-hyperlink">Java, AVL tree, cannot rotate_right, cannot find the reason</a></h3>
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            I am implementing an AVLTree class using Java, and I have met some mysterious problems:

            The AVLTree class definition looks like this: (note that there is an embedded class AVLNode)

            public class ...
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        <h3><a href="/questions/23431506/ria-java-banned-everywhere" class="question-hyperlink">RIA - Java banned everywhere</a></h3>
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            I am considering Java as a platform for development some rich internet application. As a developer I am pretty satisfied by abilities Java provides. But there is a problem - my application should be ...
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                    asked <span title="2014-05-02 15:17:20Z" class="relativetime">16 mins ago</span>
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        <h3><a href="/questions/23431420/how-to-visualize-a-picture-on-the-ui-using-primeface" class="question-hyperlink">How to visualize a picture on the UI using Primeface</a></h3>
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            I want to make a toggleable form, where each agency from my list will be in a different toggleable panel which will contain photo + additional info. Toggleable panels work perfect. I successfully take ...
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                    asked <span title="2014-05-02 15:13:16Z" class="relativetime">20 mins ago</span>
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        <h3><a href="/questions/23431412/explain-in-plain-english-algorithm-to-find-a-path-on-graph-using-hadoop" class="question-hyperlink">Explain in plain english algorithm to find a path on graph using hadoop [on hold]</a></h3>
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            I have a problem that involves finding path of a particular length on directed graph using hadoop and I found myself not been able to invent a solution.

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        <h3><a href="/questions/23431387/concatenate-string-from-bufferedreader-and-pass-to-ui-thread" class="question-hyperlink">Concatenate String from BufferedReader and Pass to UI Thread</a></h3>
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            First off, this is my first Java project! Take a look at the method below. My goal is to receive multi-line text (actually xml in a wrapper) from a socket connection. I am trying to read each line and ...
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        <h3><a href="/questions/23431070/update-a-timestamp-settingkey-in-an-sbt-0-12-task" class="question-hyperlink">Update a timestamp SettingKey in an sbt 0.12 task</a></h3>
        <div class="excerpt">
            I need a way to update a SettingKey[String] in my sbt build each time the compile task executes.  A SettingKey is necessary so it can be injected into application via sbt-buildinfo.  Creating a ...
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        <h3><a href="/questions/23430613/request-reply-with-akka-camel-and-activemq" class="question-hyperlink">request-reply with akka-camel and ActiveMQ</a></h3>
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            I'm trying to implement a very simple request-reply pattern using akka-camel.  Here's my (testbench) code which is trying to use activeMQ directly to send a message and expect a response:

            val ...
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        <h3><a href="/questions/23429244/if-i-load-my-database-connection-pool-does-it-affect-the-main-netty-thread" class="question-hyperlink">If I load my database connection pool does it affect the main netty thread?</a></h3>
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            Say I have a action method that connects to the database like this:

            @Singleton
            class Users @Inject()(userService: UserService) extends Controller {
            def dbtest = Action {
            val user = ...
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        <h3><a href="/questions/23427605/scalding-noclassdeffounderror" class="question-hyperlink">scalding NoClassDefFoundError</a></h3>
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            after installing java, scala scalding on OSX i have the following error when i try to run the WordCountJob file

            $ scripts/scald.rb --local  WordCountJob.scala --input someInputfile.txt --output ...
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        <h3><a href="/questions/23427528/kafka-consumer-not-consuming-full-message" class="question-hyperlink">Kafka Consumer not consuming full message</a></h3>
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            I have written a kafka consumer process in scala as -

            executor = endpoint.getCamelContext().getExecutorServiceManager().newFixedThreadPool(
            this, endpoint.getEndpointUri, concurrentConsumers)
            ec = ...
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                    asked <span title="2014-05-02 11:52:39Z" class="relativetime">3 hours ago</span>
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        <h3><a href="/questions/23427270/how-to-understand-the-variance-position-of-a-method-parameter-is-the-opposite-o" class="question-hyperlink">How to understand &ldquo;The variance position of a method parameter is the opposite of the variance position of the enclosing parameter clause.&rdquo;</a></h3>
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            I see this sentence is scala specification (pdf):


            The variance position of a method parameter is the opposite of the variance position of the enclosing parameter clause.


            Which is on page 44.

            ...
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        <h3><a href="/questions/23425930/generating-all-possible-combinations-from-a-listlistint-in-scala" class="question-hyperlink">Generating all possible combinations from a List[List[Int]] in Scala</a></h3>
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            Given the following list:

            List(List(1,2,3), List(4,5))


            I would like to generate all the possible combinations. Using yield, it can be done as follows:

            scala&gt; for (x &lt;- l.head; y &lt;- ...
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        <h3><a href="/questions/23424937/java-8-parallel-sorting-vs-scala-parallel-sorting" class="question-hyperlink">Java 8 parallel sorting vs Scala parallel sorting</a></h3>
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            So i was just learning new Java 8, specially lamdas and date and time api. I was comparing it with scala. My basic idea was to find the execution time difference between imperative, Stream and ...
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        <h3><a href="/questions/23423774/json4s-jackson-does-not-serialize-properties-of-the-superclass" class="question-hyperlink">JSON4S + Jackson does not serialize properties of the superclass</a></h3>
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            I'm using json4s with the jackson serializer in a scala project. My transfer objects are defined in a regular Java library. I'm also using Lombok to generate constructors/getter/setter/etc. They look ...
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        <h3><a href="/questions/23423029/what-is-mechanism-in-scala" class="question-hyperlink">What is == mechanism in Scala?</a></h3>
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            Just would like to get some detail on how scala == works when comparing two strings.

            How does object comaparision works in scala?

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        <h3><a href="/questions/23423014/is-it-possible-to-do-variables-with-local-scoping-in-c" class="question-hyperlink">Is it possible to do variables with local scoping in c#?</a></h3>
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            In Scala I can do something like this:

            val result = {
            val a = 4
            val b = 16
            a + b
            }


            Which is basically just a (in this case immutable) variable that has its own local scoping like a method.

            ...
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        <h3><a href="/questions/23420837/cant-understand-why-trait-helloa-def-testba-cant-be-compiled" class="question-hyperlink">Can&#39;t understand why `trait Hello[+A] { def test[B&lt;:A] }` can&#39;t be compiled</a></h3>
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            I can understand why the following code can't be compiled:

            trait Hello[+A] {
            def test[B&lt;:A](x: B)
            }


            Because:

            val child: Hello[String] = new Hello[String] {
            def test[B &lt;: String](x: ...
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        <h3><a href="/questions/23420687/deduplication-in-build-sbt" class="question-hyperlink">Deduplication in build.sbt</a></h3>
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            There are conflicting jline jar files in the includes path that need to be deduplicated.  I have attempted to do so as follows:

            I am building a combined spark and kafka fat jar and the jline jar file ...
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        <h3><a href="/questions/23420505/scala-return-value-not-what-is-expected" class="question-hyperlink">Scala return value not what is expected</a></h3>
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            I am learning Scala as a personal interest and I'm perplexed by the return value of the following, of which I expect to eventually print 52:

            def lexicalTest(a: Int) = {
            (b: Int) =&gt; {
            (c: ...
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        <h3><a href="/questions/23419653/passing-values-from-request-to-all-the-layers-below-controller" class="question-hyperlink">Passing values from request to all the layers below controller</a></h3>
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            If a Play controller retrieves a values from the Request (e.g. logged in user and his role) and those values need to be passed to all the layers down to controllers (e.g. service layer, DAO layer etc) ...
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================================================
FILE: src/test/resources/twitter4j.properties
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loggerFactory=twitter4j.internal.logging.SLF4JLoggerFactory
debug=true