[jboss-jira] [JBoss JIRA] Commented: (JBSER-98) Write slot with fields only if both readObject and writeObject are missing

Write slot with fields only if both readObject and writeObject are missing -------------------------------------------------------------------------- Key: JBSER-98 URL: http://jira.jboss.com/jira/browse/JBSER-98 Project: JBoss Serialization Issue Type: Feature Request Affects Versions: 1.0.3 GA Reporter: Galder Zamarreno Assigned To: Galder Zamarreno Over the last few weeks, I've been dealing with a funky support case which showed the following stacktrace: ... Caused by: org.jboss.serial.exception.SerializationException: Excepted to be String at org.jboss.serial.objectmetamodel.DataContainer$DataContainerInput.readUTF(DataContainer.java:1120) at org.jboss.serial.classmetamodel.StreamingClass.readStream(StreamingClass.java:71) at org.jboss.serial.objectmetamodel.ObjectDescriptorFactory.readObjectDescriptionFromStreaming(ObjectDescriptorFactory.java:381) at org.jboss.serial.objectmetamodel.ObjectDescriptorFactory.objectFromDescription(ObjectDescriptorFactory.java:82) at org.jboss.serial.objectmetamodel.DataContainer$DataContainerInput.readObject(DataContainer.java:845) at org.jboss.serial.persister.RegularObjectPersister.readSlotWithFields(RegularObjectPersister.java:353) at org.jboss.serial.persister.RegularObjectPersister.defaultRead(RegularObjectPersister.java:273) at org.jboss.serial.persister.RegularObjectPersister.readData(RegularObjectPersister.java:241) at org.jboss.serial.objectmetamodel.ObjectDescriptorFactory.readObjectDescriptionFromStreaming(ObjectDescriptorFactory.java:412) at org.jboss.serial.objectmetamodel.ObjectDescriptorFactory.objectFromDescription(ObjectDescriptorFactory.java:82) at org.jboss.serial.objectmetamodel.DataContainer$DataContainerInput.readObject(DataContainer.java:845) at org.jboss.serial.io.MarshalledObjectForLocalCalls.get(MarshalledObjectForLocalCalls.java:60) at org.jboss.ejb3.remoting.IsLocalInterceptor.invoke(IsLocalInterceptor.java:74) at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101) at org.jboss.ejb3.stateless.StatelessRemoteProxy.invoke(StatelessRemoteProxy.java:102) ... 28 more Caused by: java.lang.ClassCastException: org.jboss.serial.finalcontainers.IntegerContainer at org.jboss.serial.objectmetamodel.DataContainer$DataContainerInput.readUTF(DataContainer.java:1116) ... 42 more The cause of the issue was that the customer had a class where it had re-implemented readObject(java.io.ObjectInputStream stream) but had not re-implemented writeObject(java.io.ObjectOutputStream stream). This is obviously a programming error on their side, but it took a while to detect such stupid mistake. The problem within JBoss Serialization was that because this class didn't have a writeObject() reimplementation, it was a writing the class as a slot with fields, but when it came to reading it, it was reading the class as a slot with method because readObject had been reimplemented. The next time a slot with fields was read, the fields were mixed up. To avoid these type of situations, I'd suggest that: - JBS only writes as fields if *both* writeObject and readObject are missing. Right now, can't see a situation where you'd implement one and not the other, thoughts?