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Add the async module

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Every @Async behaviour that surprises people, asserted by a test and captured
to docs/output/: the self-invocation trap, what CGLIB cannot override, the
IllegalArgumentException a plain return type throws, the unbounded queue that
makes max-size decoration, spring.task.execution.propagate-context (new in
Boot 4.1.0), the two Executor beans that leave @Async on an unpooled
SimpleAsyncTaskExecutor, and JEP 491 measured on JDK 21 against JDK 25.
This commit is contained in:
Ankur Mhatre
2026-09-01 23:27:47 +05:30
commit 243cccd4ca
53 changed files with 1891 additions and 0 deletions
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async/docs/output/pinning-probe.txt Normal file
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---------------------------------------------------------------
java.version : 21.0.12.1
jdk.virtualThreadScheduler.parallelism: 2
tasks=32 sleep=300ms
no monitor held : 313 ms
blocked inside synchronized: 4806 ms
Pinned would be about 4800 ms for the synchronized run (32 tasks / 2 carriers x 300 ms).
Not pinned is about 300 ms for both.
---------------------------------------------------------------
java.version : 25.0.4.1
jdk.virtualThreadScheduler.parallelism: 2
tasks=32 sleep=300ms
no monitor held : 312 ms
blocked inside synchronized: 301 ms
Pinned would be about 4800 ms for the synchronized run (32 tasks / 2 carriers x 300 ms).
Not pinned is about 300 ms for both.