Are dead threads replaced in an ExecutionContext and/or Java thread pool?

Question

When a thread dies due to an exception, what happens to this thread? If it is inside a thread pool, does it spawn a new thread? I'm interested in what happens in scala ExecutionContext, but since an ExecutionContext wraps a java thread pool, I think that Java users will also know the answer.

For example, if I create an ExecutionContext wrapping a FixedThreadPool(100), if one thread dies, does he thread pool replace the thread?

https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/Executors.html#newFixedThreadPool-int- — Sotirios Delimanolis, Jun 19 '16 at 16:47
*If any thread terminates due to a failure during execution prior to shutdown, a new one will take its place if needed to execute subsequent tasks.* — Yuval Itzchakov, Jun 19 '16 at 16:55

score 8 · Accepted Answer · edited Sep 01 '17 at 13:49

8

The thread itself cannot spawn a new thread after it dies, however the thread pool can replace it. For example, the thread pool created by Executors.newFixedThreadPool() replaces dead threads when needed. From the documentation for Executors.newFixedThreadPool():

"If any thread terminates due to a failure during execution prior to shutdown, a new one will take its place if needed to execute subsequent tasks."

edited Sep 01 '17 at 13:49

Rohit

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answered Jun 19 '16 at 17:52

Warren Dew

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will this new thread execute the task from first or continue where dead thread has stopped? – Don Jose Feb 26 '18 at 11:41

Are dead threads replaced in an ExecutionContext and/or Java thread pool?

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