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This exception has no message.
java.lang.NullPointerException: 	at java.util.concurrent.locks.ReentrantLock.lock(ReentrantLock.java:262)	at java.util.concurrent.ConcurrentHashMap$Segment.put(ConcurrentHashMap.java:417)	at java.util.concurrent.ConcurrentHashMap.put(ConcurrentHashMap.java:883)	at java.util.concurrent.ConcurrentHashMap.readObject(ConcurrentHashMap.java:1278)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)	at java.lang.reflect.Method.invoke(Method.java:597)	at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:974)	at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1849)	at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1753)	at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1329)	at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1947)	at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1871)	at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1753)	at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1329)	at java.io.ObjectInputStream.readObject(ObjectInputStream.java:351)	at test.simulators.core.receiver.CoreResponseMessageReceiver.readSubmitObject(CoreResponseMessageReceiver.java:76)	at test.simulators.core.receiver.CoreResponseMessageReceiver.handle(CoreResponseMessageReceiver.java:46)	at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)	at org.mortbay.jetty.Server.handle(Server.java:324)	at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:505)	at org.mortbay.jetty.HttpConnection$RequestHandler.content(HttpConnection.java:842)	at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:648)	at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:211)	at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:380)	at org.mortbay.jetty.bio.SocketConnector$Connection.run(SocketConnector.java:228)	at org.mortbay.thread.BoundedThreadPool$PoolThread.run(BoundedThreadPool.java:450)