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Where do you have the deadlock? What did the thread dump say? I'd say the only situation where this can hang is, if the runnable is not actually run. Or do you get the output when it hangs?

Yes exactly! I don't get any output and therefore I suspect that the runnable doesn't even start running. I am however not sure where exactly I get the deadlock. I did create a thread dump but the only thing I could interpret, was that the .get() method was waiting for a lock