001    // Copyright 2009 Waterken Inc. under the terms of the MIT X license
002    // found at http://www.opensource.org/licenses/mit-license.html
003    package org.ref_send.promise;
004    
005    import org.joe_e.Powerless;
006    
007    /**
008     * Signals a {@link Promise#call call} to an unresolved promise.
009     */
010    public final class
011    Unresolved extends NullPointerException implements Powerless {
012        static private final long serialVersionUID = 1L;
013    }