You won’t get arrested for critizing Israel. That’s not illegal here.

You do run the risk of losing your visa, or getting deported, if you’re not a German citizen. And you might get sued for relatively minor things, if the case is connected to palestine solidarity. Also, judges and prosecutors will judge you more harshly, due to the Bundestagsresolution.

Here’s an article on the matter

Der Antisemitismusbeauftragte der Bundesregierung fordert härtere Strafen für vermeintlich antisemitische Vorfälle sowie den Einsatz von Sicherheitsbehörden wie dem Verfassungsschutz an Universitäten. Ferner sollten Aussagen wie „From the River to the Sea“ unter Strafe gestellt werden: „Mit Prävention allein kommen wir dem grassierenden Antisemitismus nicht bei.“

If you shout that Israel should be destroyed or that all Jews should …, then you might get arrested, but that’s not criticism… You can replace the country or religion with any other… Hate speech is not tolerated in Germany and that’s good.

My whole point is that criticism of Israel is equated to anisemitism. That’s the whole deal behind the ISRHA definition.