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Many threads waiting for an object lock, but the thread does not hold this lock

I have an application that is currently stuck, and I'm trying to figure out why. In the output of kill -3 (thread dump), I see many threads waiting for the object to lock (in particular, waiting for the Vector synchronized method), but I do not see any thread holding this lock.

Any idea how this can be debugged?

thank

PS I know that Vector is old, and ArrayList is more recommended, but this is legacy code I'm trying to debug.

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2 answers

The situation you are describing sounds like a classic case of a dead end.

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