Hi, 

I don't think that this is such an unusual case in a company environment. We 
are right now running into the problem that we want to upgrade to JBoss 4.0.4, 
but that we have to support client applications which are using JDK 1.3 and 
which definitely cannot upgrade the JDK right now. 

So I would be very interested in any ideas how to solve this problem!

The constraints I see are that the client apps cannot use the new 
jbossall-client.jar, since they get an "unknown major.minor version" error. And 
if they use the old client JAR, they do not know the new SingleRetryInterceptor 
class.

The Wiki (http://wiki.jboss.org/wiki/Wiki.jsp?page=RetryInterceptor) shows how 
to change the RetryInterceptor, maybe one could use this to install the old 
RetryInterceptor? But if this works, what about serialization? Maybe I'm just 
running into the next problem thereafter? 

Though there is another Wiki page 
(http://wiki.jboss.org/wiki/Wiki.jsp?page=JBossVersionCompatibilityMatrix) 
showing some options about serialization compatibility. Would this solve the 
problem finally, or is the next problem just lurking behind?

I could, of course, always install an old JBoss (3.2.x) and connect to the new 
JBoss using HTTP or similar. But then Good Bye to performance and fail-over. :-(

Thanks a lot for any help!
Martin

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