java.lang.NullPointerException: Cannot invoke "org.eclipse.jetty.http.HttpFields$Mutable.contains(String)" because "this._fields" is null

[thomas-k-git]

trafficstars

Jetty version(s) 12.0.19

Jetty Environment ee8

Java version/vendor (use: java -version) openjdk 21.0.7 2025-04-15 LTS OpenJDK Runtime Environment Temurin-21.0.7+6 (build 21.0.7+6-LTS) OpenJDK 64-Bit Server VM Temurin-21.0.7+6 (build 21.0.7+6-LTS, mixed mode, sharing)

OS type/version No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 22.04.5 LTS Release: 22.04 Codename: jammy

Description 2025-04-30 13:36:16 GRAVE org.glassfish.jersey.server.ServerRuntime$Responder writeResponse - Error while closing the output stream in order to commit response. java.lang.NullPointerException: Cannot invoke "org.eclipse.jetty.http.HttpFields$Mutable.contains(String)" because "this._fields" is null at org.eclipse.jetty.ee8.nested.Response.containsHeader(Response.java:326) at org.glassfish.jersey.servlet.internal.ResponseWriter.writeResponseStatusAndHeaders(ResponseWriter.java:135) at org.glassfish.jersey.server.ServerRuntime$Responder$1.getOutputStream(ServerRuntime.java:625) at org.glassfish.jersey.message.internal.CommittingOutputStream.commitStream(CommittingOutputStream.java:171) at org.glassfish.jersey.message.internal.CommittingOutputStream.flushBuffer(CommittingOutputStream.java:276) at org.glassfish.jersey.message.internal.CommittingOutputStream.commit(CommittingOutputStream.java:232) at org.glassfish.jersey.message.internal.CommittingOutputStream.close(CommittingOutputStream.java:247) at org.glassfish.jersey.message.internal.OutboundMessageContext.close(OutboundMessageContext.java:842) at org.glassfish.jersey.server.ContainerResponse.close(ContainerResponse.java:389) at org.glassfish.jersey.server.ServerRuntime$Responder.writeResponse(ServerRuntime.java:707) at org.glassfish.jersey.server.ServerRuntime$Responder.processResponse(ServerRuntime.java:373) at org.glassfish.jersey.server.ServerRuntime$Responder.process(ServerRuntime.java:419) at org.glassfish.jersey.server.ServerRuntime$AsyncResponder$4.run(ServerRuntime.java:872) at org.glassfish.jersey.internal.Errors$1.call(Errors.java:248) at org.glassfish.jersey.internal.Errors$1.call(Errors.java:244) at org.glassfish.jersey.internal.Errors.process(Errors.java:292) at org.glassfish.jersey.internal.Errors.process(Errors.java:274) at org.glassfish.jersey.internal.Errors.process(Errors.java:244) at org.glassfish.jersey.process.internal.RequestScope.runInScope(RequestScope.java:265) at org.glassfish.jersey.server.ServerRuntime$AsyncResponder.resume(ServerRuntime.java:889) at org.glassfish.jersey.server.ServerRuntime$AsyncResponder.resume(ServerRuntime.java:867) at org.glassfish.jersey.server.ServerRuntime$AsyncResponder$2$1.run(ServerRuntime.java:821) at org.glassfish.jersey.internal.Errors$1.call(Errors.java:248) at org.glassfish.jersey.internal.Errors$1.call(Errors.java:244) at org.glassfish.jersey.internal.Errors.process(Errors.java:292) at org.glassfish.jersey.internal.Errors.process(Errors.java:274) at org.glassfish.jersey.internal.Errors.process(Errors.java:244) at org.glassfish.jersey.process.internal.RequestScope.runInScope(RequestScope.java:265) at org.glassfish.jersey.server.ServerRuntime$AsyncResponder$2.run(ServerRuntime.java:811) at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:572) at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:317) at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1144) at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:642) at java.base/java.lang.Thread.run(Thread.java:1583)

in specific setup with async thread pool, jersey, and EOFMapper

How to reproduce? see attached project. running it a few times prodcues the NPE for me, sometimes also just issue 2.

Also seen issue 2 java.lang.IllegalStateException: AsyncContext completed and/or Request lifecycle recycled at org.eclipse.jetty.ee8.nested.AsyncContextState.state(AsyncContextState.java:42)

Also seen issue 3 java.io.IOException: content-length 11 != 0 written at org.eclipse.jetty.server.internal.HttpChannelState$ChannelCallback.succeeded(HttpChannelState.java:1548)

** Also seen* In this similar setup in our more complex application we also saw threads of the secondary thread pool (in the repro called "CUSTOM") hanging forever, that we think is related, but will try to get a separate reproducer for that. But we think it might be related / caused originally by this NPE

see attached files.

npe-report.zip