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java.lang.NullPointerException: 	at com.bd.bknet.datamodel.DefaultItem.hashCode(DefaultItem.java:361)	at java.util.HashMap.hash(HashMap.java:261)	at java.util.HashMap.put(HashMap.java:379)	at java.util.HashSet.add(HashSet.java:192)	at kodo.util.ProxyHashSet.add(ProxyHashSet.java:87)	at kodo.runtime.AbstractPCData.toField(AbstractPCData.java:70)	at kodo.remote.RemotePCDataImpl.load(RemotePCDataImpl.java:94)	at kodo.remote.FlushCommand.update(FlushCommand.java:202)	at kodo.remote.FlushCommand.execute(FlushCommand.java:132)	at kodo.remote.PersistenceManagerCommand.execute(PersistenceManagerCommand.java:28)	at kodo.remote.JDOCommand.execute(JDOCommand.java:46)	at com.solarmetric.remote.CommandIO.execute(CommandIO.java:160)	at com.solarmetric.remote.ClientHandlerRunnable.run(ClientHandlerRunnable.java:70)	at java.lang.Thread.run(Thread.java:534)