[java] Exception in thread "main" java.lang.NullPointerException
     [java] 	at java.util.concurrent.PriorityBlockingQueue.readObject(PriorityBlockingQueue.java:943)
     [java] 	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
     [java] 	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
     [java] 	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
     [java] 	at java.lang.reflect.Method.invoke(Method.java:498)
     [java] 	at org.jboss.marshalling.reflect.SerializableClass.callReadObject(SerializableClass.java:307)
     [java] 	at org.jboss.marshalling.cloner.SerializingCloner.initSerializableClone(SerializingCloner.java:303)
     [java] 	at org.jboss.marshalling.cloner.SerializingCloner.clone(SerializingCloner.java:251)
     [java] 	at org.jboss.marshalling.cloner.SerializingCloner.clone(SerializingCloner.java:128)
     [java] 	at org.jboss.marshalling.cloner.SerializingCloner.cloneFields(SerializingCloner.java:393)
     [java] 	at org.jboss.marshalling.cloner.SerializingCloner.initSerializableClone(SerializingCloner.java:309)
     [java] 	at org.jboss.marshalling.cloner.SerializingCloner.clone(SerializingCloner.java:251)
     [java] 	at org.jboss.marshalling.cloner.SerializingCloner.clone(SerializingCloner.java:128)
     [java] 	at CloningExample.testSimple(CloningExample.java:46)
     [java] 	at CloningExample.main(CloningExample.java:27)