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Threads are removed from the thread array either when they are stopped or when their {{run}} method has concluded. As a result, if a thread is not started, it continues to reside in the array despite the loss of the original reference. \[[JavaThreads 99|AA. Java References#JavaThreads 99]\] |
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Using the {{ThreadGroup}} APIs to facilitate thread shutdown also has pitfalls. "One way is for the thread initiating the termination to join the other threads and so know when those threads have terminated. However, an application may have to maintain its own list of the threads it creates because simply inspecting the {{ThreadGroup}} may return library threads that do not terminate and for which join will not return." \[[JPL 06|AA. Java References#JPL 06]\]. |
Noncompliant Code Example
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\[[API 06|AA. Java References#API 06]\] Methods {{activeCount}} and {{enumerate}}, Classes ThreadGroup and Thread
\[[JavaThreads 04|AA. Java References#JavaThreads 04]\] 13.1 ThreadGroups
\[[Bloch 01|AA. Java References#Bloch 01]\] Item 53: Avoid thread groups
\[[Goetz 06|AA. Java References#Goetz 06]\] 7.3.1. Uncaught Exception Handlers
\[[JPL 06|AA. Java References#JPL 06]\] 23.3.3. Shutdown Strategies
\[[SDN 06|AA. Java References#SDN 06]\] Bug ID: 4089701 and 4229558 |
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