f9df8c738a
Undertow does not provide a way to check if data is available to read but instead we have to try to read and see if any data is returned. This makes it impossible to implement checkOnDataAvailable without trying to read and that can lead to infinite recursion like this: ... UndertowServerHttpRequest$RequestBodyPublisher.checkOnDataAvailable(UndertowServerHttpRequest.java:156) AbstractListenerReadPublisher.changeToDemandState(AbstractListenerReadPublisher.java:177) AbstractListenerReadPublisher.access$900(AbstractListenerReadPublisher.java:47) AbstractListenerReadPublisher$State$4.onDataAvailable(AbstractListenerReadPublisher.java:319) AbstractListenerReadPublisher.onDataAvailable(AbstractListenerReadPublisher.java:85) UndertowServerHttpRequest$RequestBodyPublisher.checkOnDataAvailable(UndertowServerHttpRequest.java:156) This commit prevent the call to checkOnDataAvailable() when switching states from READING->DEMAND which implies we exited the readAndPublish loop because there was no more data to read. Issue: SPR-16545
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