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From "Albert Lee (JIRA)" <j...@apache.org>
Subject [jira] Created: (OPENJPA-559) java.rmi.MarshalException due to mismatched serialization UIDs of: Source (RepId RMI:org.apache.openjpa.kernel.DetachedStateManager
Date Fri, 04 Apr 2008 19:27:25 GMT
java.rmi.MarshalException due to mismatched serialization UIDs of: Source (RepId RMI:org.apache.openjpa.kernel.DetachedStateManager
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                 Key: OPENJPA-559
                 URL: https://issues.apache.org/jira/browse/OPENJPA-559
             Project: OpenJPA
          Issue Type: Bug
          Components: kernel
    Affects Versions: 1.0.3, 1.1.0
            Reporter: Albert Lee
            Assignee: Albert Lee
             Fix For: 1.0.3, 1.1.0


When a JSE client requests JPA function via components in an application server, in some combination
of client/server operating environment, the client request failed with the following exception
even if the client and server are using the same level of OpenJPA code:

java.rmi.MarshalException.  Error Message is:CORBA MARSHAL 0x4942f896 No; nested exception
is: 
	org.omg.CORBA.MARSHAL: Unable to read value from underlying bridge : Mismatched 
serialization UIDs : Source (RepId RMI:org.apache.openjpa.kernel.DetachedStateManager
:C7D15E4B35987A3F:766FF0A32408BC7A) = 766FF0A32408BC7A whereas Target (RepId 
RMI:org.apache.openjpa.kernel.DetachedStateManager:47697E6CFD3BF01F:548BD6248B0927C4)
 = 548BD6248B0927C4  

One of the test environment combination that we have observed this exception is a Win32 client
and a SunOS application server configuration. The client uses IBM JDK and SunOS uses Sun JDK.

>From the JavaDoc Serializable class:

"If a serializable class does not explicitly declare a serialVersionUID, then the serialization
runtime will calculate a default serialVersionUID value for that class based on various aspects
of the class, as described in the Java(TM) Object Serialization Specification. However, it
is strongly recommended that all serializable classes explicitly declare serialVersionUID
values, since the default serialVersionUID computation is highly sensitive to class details
that may vary depending on compiler implementations, and can thus result in unexpected InvalidClassExceptions
during deserialization. Therefore, to guarantee a consistent serialVersionUID value across
different java compiler implementations, a serializable class must declare an explicit serialVersionUID
value. It is also strongly advised that explicit serialVersionUID declarations use the private
modifier where possible, since such declarations apply only to the immediately declaring class--serialVersionUID
fields are not useful as inherited members."

Adding the following in DetachedStateManager resolved the problem.

    private static final long serialVersionUID = 6092198373388527556L;

Albert Lee.

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