Edit C:\Program Files\Java\jdk1.8.0_121\com\sun\javafx\tk\RenderJob.java

/*
 * Copyright (c) 2011, 2013, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
 *
 *
 *
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 *
 *
 *
 *
 *
 *
 *
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 *
 *
 *
 *
 *
 *
 *
 */

package com.sun.javafx.tk;

import java.util.concurrent.CancellationException;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.FutureTask;

/*
 * RenderJob for the Quantum toolkit.
 */
public class RenderJob extends FutureTask {

private CompletionListener listener;
    private Object             futureReturn;

public RenderJob(Runnable pen) {
        super(pen, null);
    }

public RenderJob(Runnable pen, CompletionListener cl) {
        super(pen, null);
        setCompletionListener(cl);
    }

public CompletionListener getCompletionListener() {
        return listener;
    }

public void setCompletionListener(CompletionListener cl) {
        listener = cl;
    }

@Override public void run() {
        if (super.runAndReset() == false) {
            // if (PrismSettings.verbose) {
                try {
                    Object value = super.get();
                    System.err.println("RenderJob.run: failed no exception: " + value);
                } catch (CancellationException ce) {
                    System.err.println("RenderJob.run: task cancelled");
                } catch (ExecutionException ee) {
                    System.err.println("RenderJob.run: internal exception");
                    ee.getCause().printStackTrace();
                } catch (Throwable th) {
                    th.printStackTrace();
                }
            /* } else {
                throw new IllegalArgumentException("RenderJob run failed");
            } */
        } else {
            if (listener != null) {
                try {
                    listener.done(this);
                } catch (Throwable th) {
                    th.printStackTrace();
                }
            }
        }
    }

@Override public Object get() {
        return (futureReturn);
    }

public void setFutureReturn(Object o) {
        futureReturn = o;
    }
}

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