The first step is to ask your probation officer. In most cases, you will have to get the court to modify your probation to allow you to go to Germany. The court will not like the fact that you haven't started your community service in two years and that you haven't done the NA meetings that were ordered. Still, a court might grant permission to go to Germany, because at least you haven't gotten in trouble again and your purpose for traveling is reasonable. Good luck to you.
If you are not in compliance with the terms of your probation I must disagree with my colleague. The only place you'll go after the hearing is either home or jail but Germany is not in the cards. I'm surprised you haven't been violated before now.