NPE is thrown while writing the response [SPR-14941]

[spring-projects-issues]

Violeta Georgieva opened SPR-14941 and commented

o.s.http.server.reactive.AbstractResponseBodyProcessor.State.REQUESTED state:

• onNext is invoked with a non empty DataBuffer
• The state is changed to RECEIVED, but the DataBuffer is still not processed
  (o.s.http.server.reactive.AbstractResponseBodyProcessor.receiveBuffer(DataBuffer) is not invoked)
• At that moment the web container sends event onWritePossible,
  but as the DataBuffer is still not processed, NPE is thrown when trying to write the response.

java.lang.NullPointerException: null
at org.springframework.http.server.reactive.ServletServerHttpResponse$ResponseBodyProcessor.write(ServletServerHttpResponse.java:215)
at org.springframework.http.server.reactive.AbstractResponseBodyProcessor$State$3.onWritePossible(AbstractResponseBodyProcessor.java:253)
at org.springframework.http.server.reactive.AbstractResponseBodyProcessor.onWritePossible(AbstractResponseBodyProcessor.java:113)
at org.springframework.http.server.reactive.ServletServerHttpResponse$ResponseBodyWriteListener.onWritePossible(ServletServerHttpResponse.java:247)
at org.eclipse.jetty.server.HttpOutput.run(HttpOutput.java:996)
at org.eclipse.jetty.server.handler.ContextHandler.handle(ContextHandler.java:1286)
at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:428)
at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:251)
at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:273)
at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:95)
at org.eclipse.jetty.io.SelectChannelEndPoint$2.run(SelectChannelEndPoint.java:93)
at org.eclipse.jetty.util.thread.strategy.ExecuteProduceConsume.executeProduceConsume(ExecuteProduceConsume.java:303)
at org.eclipse.jetty.util.thread.strategy.ExecuteProduceConsume.produceConsume(ExecuteProduceConsume.java:148)
at org.eclipse.jetty.util.thread.strategy.ExecuteProduceConsume.run(ExecuteProduceConsume.java:136)
at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:671)
at org.eclipse.jetty.util.thread.QueuedThreadPool$2.run(QueuedThreadPool.java:589)
at java.lang.Thread.run(Thread.java:745)

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Affects: 5.0 M3

[spring-projects-issues]

Violeta Georgieva commented

Pull Request is provided
#1243

[spring-projects-issues]

Arjen Poutsma commented

Merged. Thanks for the PR!