public List<Submission> getSubmissions() {
	return new ArrayList<Submission>(this.submissions);}
public Submission addSubmission(User user) {
	final Submission submission = new Submission(this, user);
	this.submissions.add(submission);
	user.addSubmission(submission);
	this.fireSubmissionListeners(new SubmissionListenerFireStrategy() {
		@Override
		public void fire(SubmissionListener l) {
			l.submissionAdded(submission);