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Add core-events module: @EventListener, @TransactionalEventListener phases and async listeners on Boot 4.1

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Thirteen captured transcripts: a listener is a blocking method call, ordering and chaining, SpEL conditions,
generic-event erasure, every transaction phase on commit and rollback, what an AFTER_COMMIT listener can
write, which exceptions reach the publisher, async listeners on platform and virtual threads, and the
annotations behind Spring Modulith's @ApplicationModuleListener.

Co-Authored-By: Claude Sonnet 5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01Uu7q8vPeREyT4218EJPzz1
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Claude
2026-09-24 07:08:47 +00:00
parent c418589251
commit d6b76c57db
72 changed files with 1658 additions and 0 deletions
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core-events/output/07-after-commit-writes.txt
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# An AFTER_COMMIT listener that inserts a row: three ways to declare it
--- no transaction attribute on the listener ---
inside the listener, right after the insert: audit row visible to other connections: false
after place() returned, order rows: 1
after place() returned, audit rows: 1
--- @Transactional(propagation = REQUIRES_NEW) on the listener ---
order rows: 1
audit rows: 1
--- @Transactional (REQUIRED, the default) on the listener ---
context started: false
failure chain: BeanInitializationException -> IllegalStateException
root cause: @TransactionalEventListener method must not be annotated with @Transactional unless when declared as REQUIRES_NEW or NOT_SUPPORTED: void com.ankurm.events.txwrite.required.AuditRequired.audit(com.ankurm.events.txwrite.shared.OrderPlaced)