Handling custom error response in JAX-RS 2.0 client library

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I believe you want to do something like this:

Response response = builder.get( Response.class );
if ( response.getStatusCode() != Response.Status.OK.getStatusCode() ) {
    System.out.println( response.getStatusType() );
    return null;
}

return response.readEntity( MyEntity.class );

Another thing you can try (since I don’t know where this API puts stuff — i.e. in the header or entity or what) is:

Response response = builder.get( Response.class );
if ( response.getStatusCode() != Response.Status.OK.getStatusCode() ) {
    // if they put the custom error stuff in the entity
    System.out.println( response.readEntity( String.class ) );
    return null;
}

return response.readEntity( MyEntity.class );

If you would like to generally map REST response codes to Java exception you can add a client filter to do that:

class ClientResponseLoggingFilter implements ClientResponseFilter {

    @Override
    public void filter(final ClientRequestContext reqCtx,
                       final ClientResponseContext resCtx) throws IOException {

        if ( resCtx.getStatus() == Response.Status.BAD_REQUEST.getStatusCode() ) {
            throw new MyClientException( resCtx.getStatusInfo() );
        }

        ...

In the above filter you can create specific exceptions for each code or create one generic exception type that wraps the Response code and entity.

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