java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at com.ibm.etools.references.internal.management.InternalReferenceManager.hasStar(InternalReferenceManager.java:1394)
at com.ibm.etools.references.internal.management.InternalReferenceManager$ShutdownCode.call(InternalReferenceManager.java:175)
at com.ibm.etools.references.internal.management.InternalReferenceManager$ShutdownCode.call(InternalReferenceManager.java:1)
at java.util.concurrent.FutureTask.run(FutureTask.java:267)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1143)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:618)
at java.lang.Thread.run(Thread.java:785)
at com.ibm.etools.references.internal.ReferenceThreadFactrory$ReferencesThread.run(ReferenceThreadFactrory.java:37)

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