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This exception has no message.
java.lang.NullPointerException: 	at java.util.concurrent.locks.ReentrantLock.lock(ReentrantLock.java:256)	at java.util.concurrent.ConcurrentHashMap$Segment.put(ConcurrentHashMap.java:408)	at java.util.concurrent.ConcurrentHashMap.put(ConcurrentHashMap.java:848)	at java.util.concurrent.ConcurrentHashMap.readObject(ConcurrentHashMap.java:1412)	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:592)	at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:946)	at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1812)	at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1719)	at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1305)	at java.io.ObjectInputStream.readObject(ObjectInputStream.java:348)	at com.tctest.SerializationTest.deserialize(SerializationTest.java:347)