What about converting the whole switch/case to an if else with the group processing at the end and add it to the other?
This way you wont' need to reiterate over the whole map and you can ensure that it's in order.

(A switch case statement does not guarantee any order, e.g. default can be at the top, and it would only be executed if no cases match).

I know, my correction is not very beautiful. I shortly thought about other solutions as well. One idea was e.g. to convert data.entrySet() to a List and then searching for those entries and shifting them to the end. What do you think about that?

I'm not sure, if I understood you correctly. Currently, a set gets iterated, where GROUPSTREE/GROUPSTREE_LEGACY could occur before or after setting the Latex directory. While iterating, the entries would also get processed in the same sequence, even when refactoring it to a whole if-else block, or am I missing something? Nevertheless, I will refactor it to a combined if-else now, because it looks much better.

Thanks, I think I misunderstood it a bit., Thanks for your explanation. It's more clear now.
What about using something like: data.entrySet().stream(). filter(entry,getKey() == Groups... .. || entry.getKey() == Groups...