I'm using [Stackexchange java client lib](https://stackapps.com/questions/258/stackexchange-java-client-library) I wanted to get a little more statistics but the following snippet returns only 30 answers. 

- Do I need to to register for an API key, or just use `AnswersForUserRequestConfiguration`?
- **How can I filter answers by a tag**?

> INFO: No API key provided, request
> limit will be restricted.

    List<Answer> answers = StackAppClient.getAnswersForUser(241590);
        long votes=0;
        for ( Answer a : answers ) {
        	votes += a.getUpVoteCount();
        	 System.err.println("answer:" + a);
        }
        System.err.println("votes:" + votes);

EDIT:

I think I shouldn't try to use getQuestionsForTag("java") which would return 50k+ answers and check whether I provided an answer to this question.