> Thanks JM for posting the solution. I too had the same problem. It is 
> working fine in the dev environment but not in live. both are in Linux. Not 
> sure why. Your solution helped to get it working.


If you see 

INFO: ERROR: The serialization policy file '/ 
D96C005D9FEF0E3183DC3057D9F48727.gwt.rpc' was not found; did you 
forget to include it in this deployment? 
INFO: WARNING: Failed to get the SerializationPolicy 
'D96C005D9FEF0E3183DC3057D9F48727' for module 'http://localhost:8090/ 
AdminMenu/ <http://localhost:8090/AdminMenu/>'; a legacy, 1.3.3 compatible, 
serialization policy will be 
used.  You may experience SerializationExceptions as a result. 


in your log files you must fix it to make serialization using 
java.io.Serializable work again. As the above log entry says GWT falls back 
on a legacy serialization mechanism if it can not find the 
<permutation>.gwt.rpc files. This legacy serialization mechanism requires 
you to implement IsSerializable.

So you better fix the root cause instead of relying on legacy code. If you 
need to customize the way GWT tries to load these files you can do so by 
overriding RemoteServiceServlet.doGetSerializationPolicy().

-- J. 

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