Syncing model sources across multiple WARs

One of the problems we're hitting in our development is keeping model classes synced across a multi-WAR project. For example, the model class for, say, a User object was changed in WAR B, but that developer (an intern) did not publish those changes to WARs A and C. The end result was that a few of our web service calls started failing on the unchanged WARs, while others worked fine.
I started looking into EJB3, intrigued by the @Remote and @Local setup, but those are related to the session beans themselves. I was hoping that object models could be referenced by interface across multiple WAR distributions as well, though I haven't dug up anything specific on this yet.
Is there any advice on this forum for keeping model classes in sync across a multiple-WAR project (aside from tighter repository control and swift kicks to the butt)?

Wraithe wrote:
Quoting myself: +"The end result was that a few of our web service calls started failing on the unchanged WARs"+
My original question pertaining to ensuring that the source code for the end user model classes remained consistent. You can't if the interface contains Java classes that are changed. You immediately have to deploy updated JAR files with the new code to all the clients that need it.
The JAR idea is applicable, though not ideal, and I was hoping there was some other suggestion as to how to handle client-side objects.There is: XML messaging in the service interface instead of Java classes.
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