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java.lang.NullPointerException: 	at java.util.concurrent.ConcurrentHashMap.get(ConcurrentHashMap.java:768)	at org.hibernate.impl.SessionFactoryObjectFactory.getNamedInstance(SessionFactoryObjectFactory.java:159)	at org.hibernate.impl.SessionFactoryImpl.readResolve(SessionFactoryImpl.java:753)	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.invokeReadResolve(ObjectStreamClass.java:1061)	at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1762)	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.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.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.readUnshared(ObjectInputStream.java:441)	at my.class.deserializeKey(EhcacheUtils.java:35)