I've traced the second exception to the readObject method of javax.management.openmbean.OpenType. The method has the following line: ObjectInputStream.GetField fields = in.readFields(); The class below gives the same exception when trying to deserialize: import java.io.IOException; | import java.io.ObjectInputStream; | import java.io.Serializable; | | public class MyObject implements Serializable { | | private String name; | | public MyObject() { | this.name = "Test"; | } | | private void readObject(ObjectInputStream in) throws IOException, | ClassNotFoundException { | ObjectInputStream.GetField fields = in.readFields(); | String name = (String) fields.get("name", null); | } | } View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4256652#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...