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java.lang.NullPointerException: 	at javax.management.MBeanFeatureInfo.readObject(MBeanFeatureInfo.java:80)	at sun.reflect.GeneratedMethodAccessor86.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)	at java.lang.reflect.Method.invoke(Method.java:324)	at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:838)	at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1746)	at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1646)	at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1274)	at java.io.ObjectInputStream.readArray(ObjectInputStream.java:1603)	at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1271)	at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1845)	at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1769)	at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1646)	at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1274)	at java.io.ObjectInputStream.readObject(ObjectInputStream.java:324)	at sun.rmi.server.UnicastRef.unmarshalValue(UnicastRef.java:297)	at sun.rmi.server.UnicastRef.invoke(UnicastRef.java:146)	at com.sun.jdmk.comm.RmiConnectorServerObjectImplV2_Stub.getMBeanInfo(Unknown Source)	at com.sun.jdmk.comm.comm.RmiConnectorClient.getMBeanInfo(Unknown Source)