> Thanks for the reply and information, it sounds like there is a workaround 
> then for the GWT part but we still have the same/similar issue with 
> Tomcat's authentication.  We need to solve that too else its only a partial 
> solution.
>

I am not familiar with tomcat and your overall setup but it sounds like 
your session cookie might not be correct during authentication and you 
reach some login timeout. Maybe Tomcat sets a JSESSIONID cookie for 
localhost when accessed through the proxy. Thats why I said you might need 
to rewrite cookies in your proxy.
 

Btw, regarding the GWT serialization issue...I read online some say a way 
> around this is to use IsSerializable instead of Serializable to mark 
> objects going across the wire but its not clear if that 'trick' still works 
> or not.  Also some say to drop GWT RPC and use JSON instead that doesn't 
> have the same issue.  I don't really care what the format of the data is 
> going across the wire, I just need the results to work.  Is there an easy 
> way to switch the RPC format to JSON or some other format that doesn't have 
> this issue?
>

When you use IsSerializable then GWT will fallback to an old serialization 
policy which does not require a RPC policy file. I am not very familiar 
with that old serialization policy but it is considered legacy.

You can not change the way GWT-RPC works but you could stop using GWT-RPC 
and switch to REST / JSON using https://resty-gwt.github.io . As its API on 
client side is pretty similar to GWT-RPC it should be easy to migrate. On 
server side you would use some JAX-RS 2.0 implementation like Jersey or 
RESTEasy (or others).

-- J.

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