StaticExecutor.java fixed

[klaus4040]

queues.get(nextQueueIndex++ % 4).add(task);

should probably be
queues.get(nextQueueIndex++ % queues.size()).add(task);

completly untestet and no pushrequest (sry), but right now I get an IndexOutOfBoundsException for e.g. 3 threads0

[petrbel]

thanks for comment, please create a commented PR so we can look at it with the context
it is likely that the project contains some flaws