Testcase to reproduce
    public void testRP() throws Exception {
        final RequestProcessor RP = new RequestProcessor("BrokenRP", 2);
        final AtomicBoolean outerDone = new AtomicBoolean(false);
        RequestProcessor.Task outerTask;
        outerTask = RP.post(new Runnable() {

                   @Override
                   public void run() {
                       final AtomicBoolean innerDone = new AtomicBoolean(false);
                       RequestProcessor.Task innerTask = 
                               RP.post(new Runnable() {

                                   @Override
                                   public void run() {
                                       System.err.println("Task1 start");
                                       try {
                                           Thread.sleep(5000);
                                       } catch (InterruptedException ex) {
                                           Exceptions.printStackTrace(ex);
                                       }
                                       System.err.println("Task1 finished 1");
                                       innerDone.set(true);
                                       System.err.println("Task1 finished marked");
                                   }
                               });
                       System.err.println("wait Task1");
                       innerTask.waitFinished();
                       System.err.println("after wait Task1 " + innerDone);
                       outerDone.set(innerDone.get());
                   }
               });
        outerTask.waitFinished();
        System.err.println("after wait Post " + outerDone);
        assertTrue(outerDone.get());
    }