When declaratively handling exceptions, struts is completely ignoring the exception tag I specify in my action:
I have the following Exception hierarchy (low to high): DuplicateRecordException -> DataAccessException -> ApplicationException -> BaseException -> NestableException
My UserAction invokes a register method, which like other business logic methods throws an ApplicationException so that struts can handle it.
In the case above, a DuplicateRecordException is thrown if a user tries to register with a user name that already exists. I can see through my logged output that the exception is indeed being thrown, but the registration page doesn't indicate it. This is the message I get from <html:errors/>: ???en_US.DataAccessException error in register(): ic.pd.common.DuplicateRecordException: Duplicate user exists for username='100251162'???
Whereas I'm expecting the message from the resources bundle specified by the key (error.register.duplicate) that I configured for the exception in struts-config.xml. In fact, even if I change the path in the exception tag to somewhere else, it still takes me back to my registration page, so it appears to be completely ignoring my exception tag!
I rewrote my exception classes with respect to the article, made a new DuplicateUserException class extending from ApplicationException and modified the struts-config.xml respectively and voila -- it worked!
I'm guess it must have something to do with how my exceptions were written and that struts was unable to traverse through the hierarchy to handle the DuplicateRecordException. I suspect that it could previously only handle ApplicationException types and not its children.