Synchronize message sending in HTTP SockJS sessions with request initialization [SPR-12516]

[spring-projects-issues]

Rossen Stoyanchev opened SPR-12516 and commented

AbstractHttpSockJsSession adds messages to be sent to an internal cache. This should be synchronized with request initialization (either initial or subsequent, long polling request). Not doing so means that under some circumstances a message may not get flushed until another message is written.

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Affects: 4.0.8

Referenced from: commits 9cb1569, b796c1e

Backported to: 4.0.9