java program execution is suspended and I cannot step into

Question

I am working in a project in Eclipse which uses an ExecutorService class. Well I am not familiar with multithreading or concurrency but the problem I am facing is that when I am debugging I cannot proceed to the next method by using step into (F5). To be more specific I put a breakpoint in:

pool.awaitTermination(TERMINATION_TIMEOUT, TimeUnit.DAYS);

and I cannot proceed any further. The execution is suspended and if a unsupened (by pressing the suspend button) it stops to Unsafe.park(boolean, long) which is of java and I cannot see the code. There I cannot seem to be able to proceed any further using unsuspend or step into. The really annoying is that I can proceed using resume (F8) which leads me to the next breakpoint just like nothing happened. If it's of any use the arguments seems to be TERMINATION_TIMEOUT = 100 , TimeUnit.DAYS=6 .

I have seen other posts and I am guessing that an exception was thrown ( ThreadPoolExecutor maybe) but the proposed solutions did not work for me or I did not manage to apply them.

Anyway any idea how can I overcome this issue?

Answer 1

Instead of setting breakpoint on the pool, why not set that on the Runnable instances you have put into the ExecutorService ?

If you cannot do this due to various places for submitting such Runnable s, you can simply Write a Runnable wrapper wrapping the real task and catch any exceptions thrown; then subclassing the Executor you use to actually run such an exception catching Runnable wrapper. Thus you can get all the exceptions you want.