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java.util.ConcurrentModificationException: 	at java.util.HashMap$HashIterator.nextNode(HashMap.java:1429)	at java.util.HashMap$EntryIterator.next(HashMap.java:1463)	at java.util.HashMap$EntryIterator.next(HashMap.java:1461)	at java.util.HashMap.putMapEntries(HashMap.java:511)	at java.util.HashMap.(HashMap.java:489)	at com.alcatel.pma.core.configmgmt.CollectionsTest$Task1.run(CollectionsTest.java:27)	at java.lang.Thread.run(Thread.java:745)