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spring-framework/spring-web
Hyunsik Kang a99f4dd43c Release queued body token buffers on multipart cancel
When a multipart subscriber cancels while MultipartParser has already
emitted body tokens beyond the downstream demand, those tokens are held
in the Flux.create sink queue (and in downstream operator queues such
as windowUntil). On cancellation, Reactor discards the queued tokens,
but BodyToken is not a DataBuffer, so the buffers inside the discarded
tokens are never released and Netty reports "LEAK: ByteBuf.release()
was not called before it's garbage-collected".

Register a doOnDiscard hook for BodyToken in MultipartParser.parse() so
that a discarded body token releases its buffer, both in the sink queue
and in any downstream operator queue that supports discarding.

Closes gh-37115

Signed-off-by: Hyunsik Kang <cj848@hanmail.net>
2026-08-28 16:26:47 +02:00
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