How to monitor queue size of a thread pool

hi. i am trying to check out during runtime, the queue of waiting tasks of a
thread pool.
I am using org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor
and calling this:

ThreadPoolTaskExecutor.getThreadPoolExecutor().getQueue().size()

But it returns the pool size and not the queue size  (which should be
different where pool size is the threads which are available to run and
queue size is the tasks waiting to be executed in those threads)

Anybody knows how to extarct this information?

Thanks, Michal
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