Jersey Exception mappers not working when jackson deserialization fails

Question

I am using Jersey 2.10 with Jackson serialization/deserialization feature in my REST API.

My idea is to make my REST API to always return a standard JSON error resp

Answer 1

I had the same problem, and the previous answer led me to the solution, but was not forking for me current Jersey (2.22). At first, I needed to use the org.glassfish.jersey.spi.ExtendedExceptionMapper like described in https://jersey.java.net/documentation/latest/representations.html.

Furthermore, Jersey is checking for an exception mapper, which is as close as possible to the thrown exception (from org.glassfish.jersey.internal.ExceptionMapperFactory):

for (final ExceptionMapperType mapperType : exceptionMapperTypes) {
        final int d = distance(type, mapperType.exceptionType);
        if (d >= 0 && d <= minDistance) {
            final ExceptionMapper candidate = mapperType.mapper.getService();

            if (isPreferredCandidate(exceptionInstance, candidate, d == minDistance)) {
                mapper = candidate;
                minDistance = d;
                if (d == 0) {
                    // slight optimization: if the distance is 0, it is already the best case, so we can exit
                    return mapper;
                }
            }
        }
    }

Therefore I needed to map exactly the exception and not a more general exception.

In the end, my provider looks as follows:

@Provider
public final class JsonParseExceptionExceptionHandler implements ExtendedExceptionMapper {
    @Override
    public Response toResponse(final JsonParseException exception) {
        exception.printStackTrace();
        return Response.status(Response.Status.BAD_REQUEST).entity("JSON nicht in korrektem Format.").build();
    }

    @Override
    public boolean isMappable(final JsonParseException arg0) {
        return true;
    }
}