The following simple jtreg test is failed:
------------------------------
/* @test
   @bug 6593649
   @summary Word wrap does not work in JTextArea: long lines are not wrapped
   @author Lillian Angel
   @run main Test6593649
*/
import javax.swing.*;

public class Test6593649 {
    public static void main(String[] args) throws Exception {
        SwingUtilities.invokeAndWait(new Runnable() {
            public void run() {
                final JFrame frame = new JFrame();

                frame.setSize(200, 100);

                frame.setVisible(true);
            }
        });
    }
}
------------------------------

At the same time if you remove the "frame.setSize(200, 100);" line it passes. Actually it looks like a regression.
I noteced also that replacing JFrame by Frame makes the test workable.
Below is a stacktrace:

java.lang.IllegalStateException: Buffers have not been created
at sun.awt.windows.WComponentPeer.getBackBuffer(WComponentPeer.java:965)
at java.awt.Component$FlipBufferStrategy.getBackBuffer(Component.java:3971)
at java.awt.Component$FlipBufferStrategy.updateInternalBuffers(Component.java:3956)
at java.awt.Component$FlipBufferStrategy.createBuffers(Component.java:3947)
at java.awt.Component$FlipBufferStrategy.<init>(Component.java:3886)
at java.awt.Component$FlipSubRegionBufferStrategy.<init>(Component.java:4409)
at java.awt.Component.createBufferStrategy(Component.java:3768)
at java.awt.Window.createBufferStrategy(Window.java:3272)
at javax.swing.BufferStrategyPaintManager$BufferInfo.createBufferStrategy(BufferStrategyPaintManager.java:863)
at javax.swing.BufferStrategyPaintManager$BufferInfo.createBufferStrategy(BufferStrategyPaintManager.java:814)
at javax.swing.BufferStrategyPaintManager$BufferInfo.getBufferStrategy(BufferStrategyPaintManager.java:747)
at javax.swing.BufferStrategyPaintManager.prepare(BufferStrategyPaintManager.java:523)
at javax.swing.BufferStrategyPaintManager.paint(BufferStrategyPaintManager.java:281)
at javax.swing.RepaintManager.paint(RepaintManager.java:1206)
at javax.swing.JComponent.paint(JComponent.java:1042)
at java.awt.GraphicsCallback$PaintCallback.run(GraphicsCallback.java:39)
at sun.awt.SunGraphicsCallback.runOneComponent(SunGraphicsCallback.java:78)
at sun.awt.SunGraphicsCallback.runComponents(SunGraphicsCallback.java:115)
at java.awt.Container.paint(Container.java:1942)
at java.awt.Window.paint(Window.java:3783)
at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:781)
at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:728)
at javax.swing.RepaintManager.prePaintDirtyRegions(RepaintManager.java:677)
at javax.swing.RepaintManager.access$700(RepaintManager.java:59)
at javax.swing.RepaintManager$ProcessingRunnable.run(RepaintManager.java:1621)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:251)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:649)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:255)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:170)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:160)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:155)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:147)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:136)