class DefaultExceptionMapper implements ExceptionMapper<Throwable> {

    @Override
    public Response toResponse(final Throwable ex) {
        final Throwable rootCause = ExceptionUtils.getRootCause(ex);
        final Throwable cause = (rootCause == null) ? ex : rootCause;

        LOGGER.error("Error occurred: {}. Root cause: {}", ex.getMessage(), cause.getMessage());
        LOGGER.debug(null, ex);
        LOGGER.debug(null, cause);

        return Response.status(Response.Status.INTERNAL_SERVER_ERROR)
                .entity(cause.getMessage())
                .type(MediaType.TEXT_PLAIN)
                .build();
    }

}