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JSR 356: Java API for WebSocket
There is a newer version: 1.1
/*
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package javax.websocket;

/**
 * The result of asynchronously sending a web socket message. A SendResult is either
 * ok indicating there was no problem, or is not OK in which case there was a problem
 * and it carries an exception to indicate what the problem was.
 *
 * @author dannycoward
 */
final public class SendResult {

    private final Throwable exception;
    private final boolean isOK;

    /**
     * Construct a SendResult carrying an exception.
     *
     * @param exception the exception causing a send failure.
     */
    public SendResult(Throwable exception) {
        this.exception = exception;
        this.isOK = false;
    }

    /**
     * Construct a SendResult signifying a successful send carrying no exception.
     */
    public SendResult() {
        this.exception = null;
        this.isOK = true;
    }

    /**
     * The problem sending the message.
     *
     * @return the problem or {@code null} if the send was successful.
     */
    public Throwable getException() {
        return exception;
    }

    /**
     * Determines if this result is ok or not.
     *
     * @return whether the send was successful or not.
     */
    public boolean isOK() {
        return this.isOK;
    }
}