java.util.ConcurrentModificationException: This exception has no message.

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java.util.ConcurrentModificationException:
at java.util.HashMap$HashIterator.nextEntry(HashMap.java:750)
at java.util.HashMap$EntryIterator.next(HashMap.java:792)
at java.util.HashMap.putAllForCreate(HashMap.java:408)
at java.util.HashMap.clone(HashMap.java:624)
at java.util.HashSet.clone(HashSet.java:217)
at weblogic.socket.PosixSocketMuxer.closeSockets(PosixSocketMuxer.java:486)
at weblogic.socket.PosixSocketMuxer.processSockets(PosixSocketMuxer.java:589)
at weblogic.socket.SocketReaderRequest.execute(SocketReaderRequest.java:24)
at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:139)
at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:120)

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