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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