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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 com.tctest.SerializationTest.deserialize(