The test Access_JTreg/Automated/test/javax/swing/JPopupMenuTest.java fails with the following exception:

[2015-04-13T02:05:26.37] java.lang.NullPointerException
[2015-04-13T02:05:26.37] at JPopupMenuTest.start(JPopupMenuTest.java:125)
[2015-04-13T02:05:26.37] at com.sun.javatest.regtest.AppletWrapper$AppletThread.run(AppletWrapper.java:145)
[2015-04-13T02:05:26.37] at java.lang.Thread.run(Unknown Source)
[2015-04-13T02:05:26.37] STATUS:Failed.Applet thread threw exception: java.lang.NullPointerException

Reproducible: Very rarely
Is it a Regression: Not sure. I wasn't able to reproduce the issue on 8u33 b05, however, the first time it appeared was 8 b20.
Steps to reproduce: (On Linux) Run the following command and wait till the test fails:

while true; do DISPLAY=:0 java com.sun.javatest.regtest.AppletWrapper JPopupMenuTest.java/JPopupMenuTest.aarg; done

I found that the test don't handle any exceptions in the method start() and this makes it impossible to obtain the error report. Here's a snippet from the test code:

public void start() {
    try { Thread.sleep(3000); } catch (Exception e) {}
    activatePopupMenuRobotically();

    AccessibleContext ac = comp.getAccessibleContext();

    /*******************************************************
     * AccessibleContext methods.
     *******************************************************/

    if(ac == null) {
      addFailure("getAccessibleContext returned null!");
    }
...
    // AccessibleValue
    AccessibleValue aval = ac.getAccessibleValue();
    if(aval != null) {
        addFailure("getAccessibleValue should not return a non-null value");
    }
    report();
}

As it shown above, there's no chance to get the message 'getAccessibleContext returned null!'. The report method will never be invoked due to NPE occurring right before it's called. I put the report method into finally block and got the following message:

java.lang.RuntimeException: JPopupMenuTest test failed:
getAccessibleParent should not return null because this JPopupMenu has the parents

        at BaseTestUtil.report(BaseTestUtil.java:89)
        at JBaseTest.report(JBaseTest.java:24)
        at JPopupMenuTest.start(JPopupMenuTest.java:197)
        at com.sun.javatest.regtest.AppletWrapper$AppletThread.run(AppletWrapper.java:145)
        at java.lang.Thread.run(Unknown Source)