Hi all,
I am currently using Dropwizard 1.0.3. In my application, I have a resource
method that reads a path parameter and map it to a Mustache view (e.g.
/static/{viewName} maps to a Mustache template called
/views/{viewName}.mustache). For error handling, I want to return a 404
error w/ a custom page when the view template does not exist.
To achieve that, I want to handle it naturally and let the Mustache view
renderer code propagate a WebApplicationException up, where I would then
capture and return a custom 404 error page via an ExceptionMapper. However,
the custom ExceptionMapper doesn't capture the exception, leading me to
believe that either there is a bug with the exception handling code, or I
don't fully understand how the exception handling works.
>From what I can tell by reading the Mustache and Dropwizard code, I believe
that the exception is propagated up as follows:
1. DefaultMustacheFactory (part of Mustache) throws a
MustacheNotFoundException
2. MustacheViewRenderer (part of dropwizard-views-mustache) catches the
above exception and re-throw it as a RuntimeException
3. ViewMessageBodyWriter (part of dropwizard-views) catches the above
exception and re-throw it as a WebApplicationException
4. My custom ExceptionHandler<WebApplicationException> intercepts the above
exception and does something with it
Through debugging using breakpoints in Eclipse, I can tell that #1 - #3 are
done, and #4 is not done. I can only think of the fact that the exception
thrown at the writing phase is already too late or in the wrong area for
the ExceptionHandler to capture, or that there is another ExceptionHandler
at work taking over. In the last case, I looked at the default
ExceptionHandlers in Dropwizard and can only see the LoggingExceptionMapper
being the only culprit. However I think it's unlikely because the same
custom ExceptionHandler can handle NotFoundExceptions (which is also a
sub-class of WebApplicationException) correctly.
Any assistance on this matter would be greatly appreciated.
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