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Well, I just went with multiple Lists.
For this purpose I wrote this class, maybe somebody else can find use for it:

import java.util.ArrayList;
import java.util.ConcurrentModificationException;...

Still looking for help. I would really appreciate just some opinions from experienced programmers.

Sure, if you really need it.

Exception in thread "main" java.util.ConcurrentModificationException
at java.util.ArrayList$Itr.checkForComodification(Unknown Source)
at...

Hi.

I have a problem with a concurrent modification exception in a listener-based application. It comes from removing a listener while the listener is active.
Here is a simple example program:
...