Oh wow, I thought I was losing my mind. Yes, I'm seeing this. I'm currently disconnected from my external monitors and tried running some Java apps, and now they work! When connected to the external displays they would just hang, showing that little Java window in the Dock, and the only way to kill them was to 'Force Quit'.
[2018 MBP 15", 10.14.2, DL 5.0.1).
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