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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)