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Vaadin Flow 2.9.0.beta1

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@vaadin-bot vaadin-bot released this 18 Apr 08:27
· 31 commits to 2.9 since this release
2.9.0.beta1
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Changes since 2.9.0.alpha2

All changes

Fixes

  • Prevent deadlock on concurrent push disconnection (#16544)
    Commit · Pull request · Issue

    If the AtmospherePushConnection.disconnect method is invoked concurrently by multiple threads, a deadlock may happen if the servlet container somehow locks HTTP session, as closing AtmosphereResource may cause accesses to the HTTP session. For example, is a thread (A) is invalidating the HTTP session, thus closing Vaadin UIs and disconnecting push, and another thread (B) is also requesting a push disconnect, then B will be blocked when closing the atmosphere resource by the lock on the session held by A, but A is actually waiting to acquire the lock on AtmospherePushConnection held by B, causing the deadlock. This change allows a single thread to perform the disconnect operation, to avoid potential deadlocks.

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