IIRC the javadoc for HashMap does warn you about this I hit this issue in production about 2/3 years back and it didn't affect the functionality of the runnin

IIRC the javadoc for HashMap does warn you about this I hit this issue in production about 2/3 years back and it didn't affect the functionality of the running process that much, but there was a thread spinning endlessly for a few days until the next restart window. Moral of the story: remember to use the right tool for the job and read the usage manual!