Serialization of ManagedPropertyImpl map results in NPE due to circular reference --------------------------------------------------------------------------------- Key: JBMICROCONT-145 URL: http://jira.jboss.com/jira/browse/JBMICROCONT-145 Project: JBoss MicroContainer Issue Type: Bug Affects Versions: JBossMC_2_0_0 Beta Reporter: Scott M Stark Assigned To: Scott M Stark Fix For: JBossMC_2_0_0_CR1 If one serializes a Map of ManagedProperties associated with a ManagedObject, the following NPE results when trying to unserialize the Map: java.lang.NullPointerException at org.jboss.managed.plugins.ManagedPropertyImpl.hashCode(ManagedPropertyImpl.java:259) at java.util.HashMap.put(HashMap.java:418) at java.util.HashSet.readObject(HashSet.java:279) 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:585) at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:946) at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1809) at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1719) at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1305) at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1908) at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1832) at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1719) at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1305) at java.io.ObjectInputStream.access$300(ObjectInputStream.java:185) at java.io.ObjectInputStream$GetFieldImpl.readFields(ObjectInputStream.java:2069) at java.io.ObjectInputStream.readFields(ObjectInputStream.java:518) at org.jboss.managed.plugins.ManagedPropertyImpl.readObject(ManagedPropertyImpl.java:304) 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:585) at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:946) at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1809) 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 AOPContainerProxy$1.readObject(AOPContainerProxy$1.java) 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:585) at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:946) at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1809) 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 java.util.HashMap.readObject(HashMap.java:1067) 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:585) at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:946) at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1809) 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 org.jboss.test.AbstractTestCase.deserialize(AbstractTestCase.java:235) at org.jboss.test.managed.mock.MockTest.testManagedPropertyMapSerialization(MockTest.java:135) The problem is that following relationship results: Map -> ManagedProperty@1 -> MangedObject -> Set<ManagedProperty> -> ManagedProperty(a)1.hashCode() A ManagedProperty that is in its readObject is deserializing its MangedObject, which deserializes its Set<ManagedProperty> properties. The ManagedProperty instance in its readObject method is seen to be already deserialized, and when its added to the Set its hashCode is called, but since the name field has not been retrieved, the NPE results. -- This message is automatically generated by JIRA. - If you think it was sent incorrectly contact one of the administrators: http://jira.jboss.com/jira/secure/Administrators.jspa - For more information on JIRA, see: http://www.atlassian.com/software/jira