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This exception has no message.
java.lang.NullPointerException at java.util.concurrent.locks.ReentrantLock.lock( at java.util.concurrent.ConcurrentHashMap$Segment.put( at java.util.concurrent.ConcurrentHashMap.put( at java.util.concurrent.ConcurrentHashMap.readObject( at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke( at sun.reflect.DelegatingMethodAccessorImpl.invoke( at java.lang.reflect.Method.invoke( at at at at at at at at at at test.simulators.core.receiver.CoreResponseMessageReceiver.readSubmitObject( at test.simulators.core.receiver.CoreResponseMessageReceiver.handle( at org.mortbay.jetty.handler.HandlerWrapper.handle( at org.mortbay.jetty.Server.handle( at org.mortbay.jetty.HttpConnection.handleRequest( at org.mortbay.jetty.HttpConnection$RequestHandler.content( at org.mortbay.jetty.HttpParser.parseNext( at org.mortbay.jetty.HttpParser.parseAvailable( at org.mortbay.jetty.HttpConnection.handle( at$ at org.mortbay.thread.BoundedThreadPool$