[Resteasy-developers] Capture Response Payload in JAX-RS filter

[Hiten P <hp...@ou...>]

Hello,

I want to capture and log the response payload in JAX-RS filter. Here is the code snippet of the filter method that I'm using to intercept the response. (FYI - I'm using RestEasy for implementation)

@Override
public void filter(final ContainerRequestContext requestContext, final ContainerResponseContext         responseContext) throws IOException {
    ...
      final OutputStream out = responseContext.getEntityStream();
       try (ByteArrayOutputStream baos = new ByteArrayOutputStream()) {
               out.write(baos.toByteArray());
        ....
   }
}

However, the ByteArrayOutputStream turns out be empty. Looking at the RestEasy code, it's using DeferredOutputStream, but not sure how it would matter here in pulling the response payload. I have tried writing to byte[] directly, but that doesn't help either. Am I missing anything here ? Thanks.