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java.lang.NullPointerException: 	at weblogic.ejb20.internal.HandleImpl.readExternal(HandleImpl.java:101)	at java.io.ObjectInputStream.inputObject(ObjectInputStream.java:1212)	at java.io.ObjectInputStream.readObject(ObjectInputStream.java:386)	at java.io.ObjectInputStream.inputClassFields(ObjectInputStream.java:2263)	at java.io.ObjectInputStream.defaultReadObject(ObjectInputStream.java:519)	at java.io.ObjectInputStream.inputObject(ObjectInputStream.java:1412)	at java.io.ObjectInputStream.readObject(ObjectInputStream.java:386)	at java.io.ObjectInputStream.readObject(ObjectInputStream.java:236)	at java.util.ArrayList.readObject(ArrayList.java:531)	at java.lang.reflect.Method.invoke(Native Method)	at java.io.ObjectInputStream.invokeObjectReader(ObjectInputStream.java:2214)	at java.io.ObjectInputStream.inputObject(ObjectInputStream.java:1411)	at java.io.ObjectInputStream.readObject(ObjectInputStream.java:386)	at java.io.ObjectInputStream.readObject(ObjectInputStream.java:236)