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The following table shows a possible execution order:
Time | Task | Pool Thread | Submitted by Method | Day |
|---|---|---|---|---|
1 | t1 | 1 |
| Friday |
2 | t2 | 2 |
| Monday |
3 | t3 | 1 |
| Friday |
In this execution order, it is expected that the two tasks (t2 and t3) started from doSomething2() would observe the current day as Monday. However, because pool thread 1 is reused, t3 observes the day to be Friday.
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Objects using ThreadLocal data and executed by different tasks in a thread pool without reinitialization might be in an unexpected state when reused.
Rule | Severity | Likelihood |
|---|
Detectable | Repairable | Priority | Level |
|---|---|---|---|
TPS04-J | Medium | Probable | Yes |
No |
P8 |
L2 |
Bibliography
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