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java.util.ConcurrentModificationException: 	at java.util.HashMap$HashIterator.nextEntry(HashMap.java:762)	at java.util.HashMap$KeyIterator.next(HashMap.java:798)	at serp.util.LookaheadIterator.setNext(LookaheadIterator.java:135)	at serp.util.LookaheadIterator.next(LookaheadIterator.java:60)	at com.solarmetric.kodo.impl.jdbc.JDBCPersistenceManagerFactory.flushDeferredRegistrations(JDBCPersistenceManagerFactory.java:512)	at com.solarmetric.kodo.impl.jdbc.JDBCPersistenceManagerFactory.configurePersistenceManager(JDBCPersistenceManagerFactory.java:669)	at com.solarmetric.kodo.runtime.PersistenceManagerFactoryImpl.newPersistenceManager(PersistenceManagerFactoryImpl.java:674)	at com.solarmetric.kodo.runtime.PersistenceManagerFactoryImpl.getPersistenceManager(PersistenceManagerFactoryImpl.java:208)	at com.solarmetric.kodo.runtime.PersistenceManagerFactoryImpl.getPersistenceManager(PersistenceManagerFactoryImpl.java:140)