[jira] [Created] (WW-4433) ConventionUnknownHandler change breaks exception handling in interceptors.

["Joseph Wolschon (JIRA)" <ji...@apache.org>]

Joseph Wolschon created WW-4433:
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             Summary: ConventionUnknownHandler change breaks exception handling in interceptors.
                 Key: WW-4433
                 URL: https://issues.apache.org/jira/browse/WW-4433
             Project: Struts 2
          Issue Type: Bug
          Components: Core Interceptors, Documentation, Plugin - Convention
    Affects Versions: 2.3.20
            Reporter: Joseph Wolschon
            Priority: Minor


Struts 2.3.20 appears to have caused a regression that prevents exceptions thrown from convention-plugin actions from reaching ExceptionMappingInterceptor. This breaks exception handling when using the convention-plugin.

To Reproduce: 

* Generate a project struts2-archetype-convention archetype using 2.3.20
* Throw exception in the action. With 2.3.20, a blank page is shown.
* Change to 2.3.16.3 and you will get the standard struts2 error page.

The breaking change appears to have been made in WW-4331: https://issues.apache.org/jira/browse/WW-4331. This causes error interceptor code to break (showing a blank page when exceptions are thrown) as DefaultActionInvocation does not catch an exception from the default UnknownHandler implementation execution, which would previously re-throw the original exception back up for the interceptors to catch. 

Workaround:

We've created our own UnknownHandler implementation that just throws a new NoSuchMethodException, allowing DefaultActionInvocation to re-throw the original exception so that our error interceptor can again catch it.




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