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streamsupport-cfuture is a backport of the Java 8 CompletableFuture API with the current Java 9 (JEP 266) enhancements for Java 6 to 8 and Android developers

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/*
 * Written by Doug Lea with assistance from members of JCP JSR-166
 * Expert Group and released to the public domain, as explained at
 * http://creativecommons.org/publicdomain/zero/1.0/
 */
package java8.util.concurrent;

/**
 * Exception thrown when an error or other exception is encountered
 * in the course of completing a result or task.
 *
 * @since 1.8
 * @author Doug Lea
 */
public class CompletionException extends RuntimeException {
// CVS rev. 1.3
    private static final long serialVersionUID = 7830266012832686185L;

    /**
     * Constructs a {@code CompletionException} with no detail message.
     * The cause is not initialized, and may subsequently be
     * initialized by a call to {@link #initCause(Throwable) initCause}.
     */
    protected CompletionException() { }

    /**
     * Constructs a {@code CompletionException} with the specified detail
     * message. The cause is not initialized, and may subsequently be
     * initialized by a call to {@link #initCause(Throwable) initCause}.
     *
     * @param message the detail message
     */
    protected CompletionException(String message) {
        super(message);
    }

    /**
     * Constructs a {@code CompletionException} with the specified detail
     * message and cause.
     *
     * @param  message the detail message
     * @param  cause the cause (which is saved for later retrieval by the
     *         {@link #getCause()} method)
     */
    public CompletionException(String message, Throwable cause) {
        super(message, cause);
    }

    /**
     * Constructs a {@code CompletionException} with the specified cause.
     * The detail message is set to {@code (cause == null ? null :
     * cause.toString())} (which typically contains the class and
     * detail message of {@code cause}).
     *
     * @param  cause the cause (which is saved for later retrieval by the
     *         {@link #getCause()} method)
     */
    public CompletionException(Throwable cause) {
        super(cause);
    }
}