JAX-RS: Custom exception not getting propagated

[ssen <ss...@pacbell.net>]

I have a resource method as follows that streams file content.

@Produces({"application/octet-stream", "application/json"})
public class Foo {
..
 @GET
  public File getReport(...) 

When there is a specific exception thrown from the application layer, I need to 
send back a java object and a 404 response code encoded in JSON format.

I tried adding an exception mapper and I see the toResponse method of the mapper 
getting invoked when
the exception is thrown from the resource.

But the client is receiving a HTTP 500 response code and the exception content 
is not traveling back to the client. 


How can I debug this?

I traced to JAXRSInvoker.invoke and see that the Response that is generated from 
the exception mapper is added to the MessageContentsList. But somehow, the 
content is getting dropped during the response.

When I throw a generic exception, it gets propagated back encoded in text/html 
and response code 500. But I would like to return a specific response code and 
the JSON object.

Is there any issue when the response type of a method is File?

We are using version 2.2.10.

Thanks for any help,
Shantanu Sen

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