I am developing one jmx mbean, it's function is persisting my class with hibernate, when i start mbean, and run a short time, there are no problem, but anthor day, when I call it again, it encounts exception as follow:
java.rmi.UnmarshalException: Error unmarshaling return; nested exception is:
java.lang.ClassNotFoundException: org.hibernate.TransactionException (no security manager: RMI class loader disabled)
at sun.rmi.transport.StreamRemoteCall.executeCall(StreamRemoteCall.java:217)
at sun.rmi.server.UnicastRef.invoke(UnicastRef.java:126)
at com.sun.jmx.remote.internal.PRef.invoke(Unknown Source)
at javax.management.remote.rmi.RMIConnectionImpl_Stub.invoke(Unknown Source)
at javax.management.remote.rmi.RMIConnector$RemoteMBeanServerConnection.invoke(RMIConnector.java:969)
at cn.com.dhit.management.client.ConfigTreeAPI.query(ConfigTreeAPI.java:31)
at Test.testConfig(Test.java:22)
at Test.main(Test.java:106)
Caused by: java.lang.ClassNotFoundException: org.hibernate.TransactionException (no security manager: RMI class loader disabled)
at sun.rmi.server.LoaderHandler.loadClass(LoaderHandler.java:371)
at sun.rmi.server.LoaderHandler.loadClass(LoaderHandler.java:165)
at java.rmi.server.RMIClassLoader$2.loadClass(RMIClassLoader.java:620)
at java.rmi.server.RMIClassLoader.loadClass(RMIClassLoader.java:247)
at sun.rmi.server.MarshalInputStream.resolveClass(MarshalInputStream.java:197)
at java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1538)
at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1460)
at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1693)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1299)
at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1912)
at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1836)
at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1713)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1299)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:339)
at sun.rmi.transport.StreamRemoteCall.executeCall(StreamRemoteCall.java:215)
... 7 more

anybody can give me any hints, thank you![/b]