I'm using Stackexchange java client lib 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);