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https://issues.apache.org/jira/browse/WW-4433?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14247139#comment-14247139
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Joseph Wolschon commented on WW-4433:
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An improper deprecation was also added to the interface that makes it unclear
if this is an intentional deprecation to UnknownHandler implementation or a
change to default Struts behavior:
https://fisheye6.atlassian.com/browse/struts/xwork-core/src/main/java/com/opensymphony/xwork2/UnknownHandler.java?r1=0c543aef318341ca9bd482e15f1637497b8a4dfd&r2=ff100ce2d9c939e9cf4867bc46966a7dfecb6770.
> 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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