用dropwizard捕获json处理异常？

Question

I have a dropwizard application with a global exception handler registered that implements ExceptionMapper<Throwable> . If I throw any runtime exception from within a resource the mapper gets hit.

However, in a test I am posting JSON to to a resource with a missing type discriminator for a jackson polymorphic type. Jersey is returning a 400, and I can see that a JsonProcessingException is being thrown when stepping through the code, but the global mapper isn't getting hit.

I tried to see if there were any other exception mappers registered and to try and unregister them, by checking the environment.jersey().getResourceConfig().getSingletons() set and there were no other exception mappers registered.

I've also tried creating a specific handler for just that exception but no dice. And even then that's kind of weird if I already have a global handler to catch all Throwable.

Has anyone encountered this?

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EDIT:

looks like the dropwizard exception mapper does get registered and I somehow need to find out when in the lifecycle that happens and unregister it

Answer 1

Yes, you do need to override the exception mapper for JsonProcessingException ( JsonProcessingExceptionMapper ).

looks like the dropwizard exception mapper does get registered and I somehow need to find out when in the lifecycle that happens and unregister it

You can find out how to override an ExceptionMapper on this answer .