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I have an application which has to live as a service, I create an object which then spawns off a buch of threads.
If I set the only reference to that object to null will all the child threads get cleaned up? or will I suffer from a memory leak.
Do I have to explicitly terminate all the child threads?
Yes, you need to make sure your other threads stop. The garbage collector is irrelevant to this. You should also do so in an orderly fashion though – don’t just abort them.
Here’s a pattern in C# for terminating threads co-operatively – it’s easy to translate to Java.