NullPointerException in EndpointServerWebExchangeMatcher.matches

[madgnome]

We're getting NPE in EndpointServerWebExchangeMatcher.matches when starting our service (Spring Boot 2.0.4)

java.lang.NullPointerException: null
	at org.springframework.boot.actuate.autoconfigure.security.reactive.EndpointRequest$EndpointServerWebExchangeMatcher.matches(EndpointRequest.java:238)
	at org.springframework.boot.security.reactive.ApplicationContextServerWebExchangeMatcher.matches(ApplicationContextServerWebExchangeMatcher.java:57)
	at org.springframework.security.web.server.MatcherSecurityWebFilterChain.matches(MatcherSecurityWebFilterChain.java:48)
	at org.springframework.security.web.server.WebFilterChainProxy.lambda$filter$0(WebFilterChainProxy.java:50)
	at reactor.core.publisher.FluxFilterWhen$FluxFilterWhenSubscriber.drain(FluxFilterWhen.java:242)
	at reactor.core.publisher.FluxFilterWhen$FluxFilterWhenSubscriber.onNext(FluxFilterWhen.java:131)
	at org.springframework.cloud.sleuth.instrument.reactor.ScopePassingSpanSubscriber.onNext(ScopePassingSpanSubscriber.java:81)
	at reactor.core.publisher.FluxIterable$IterableSubscription.slowPath(FluxIterable.java:244)
	at reactor.core.publisher.FluxIterable$IterableSubscription.request(FluxIterable.java:202)
	at org.springframework.cloud.sleuth.instrument.reactor.ScopePassingSpanSubscriber.request(ScopePassingSpanSubscriber.java:69)
	at reactor.core.publisher.FluxFilterWhen$FluxFilterWhenSubscriber.onSubscribe(FluxFilterWhen.java:190)
	at org.springframework.cloud.sleuth.instrument.reactor.ScopePassingSpanSubscriber.onSubscribe(ScopePassingSpanSubscriber.java:63)
	at reactor.core.publisher.FluxIterable.subscribe(FluxIterable.java:140)
	at reactor.core.publisher.FluxIterable.subscribe(FluxIterable.java:64)
	at reactor.core.publisher.FluxLiftFuseable.subscribe(FluxLiftFuseable.java:70)
	at reactor.core.publisher.FluxFilterWhen.subscribe(FluxFilterWhen.java:68)
	at reactor.core.publisher.FluxLift.subscribe(FluxLift.java:46)
	at reactor.core.publisher.MonoNext.subscribe(MonoNext.java:40)
	at reactor.core.publisher.MonoLift.subscribe(MonoLift.java:46)
	at reactor.core.publisher.MonoSwitchIfEmpty.subscribe(MonoSwitchIfEmpty.java:44)
	at reactor.core.publisher.MonoLift.subscribe(MonoLift.java:46)
	at reactor.core.publisher.MonoFlatMap.subscribe(MonoFlatMap.java:60)
	at reactor.core.publisher.MonoLiftFuseable.subscribe(MonoLiftFuseable.java:56)
	at reactor.core.publisher.MonoMapFuseable.subscribe(MonoMapFuseable.java:59)
	at reactor.core.publisher.MonoLiftFuseable.subscribe(MonoLiftFuseable.java:56)
	at reactor.core.publisher.MonoMapFuseable.subscribe(MonoMapFuseable.java:59)
	at reactor.core.publisher.MonoLiftFuseable.subscribe(MonoLiftFuseable.java:56)
	at reactor.core.publisher.MonoFlatMap.subscribe(MonoFlatMap.java:60)
	at reactor.core.publisher.MonoLiftFuseable.subscribe(MonoLiftFuseable.java:56)
	at reactor.core.publisher.MonoDefer.subscribe(MonoDefer.java:53)
	at reactor.core.publisher.MonoLift.subscribe(MonoLift.java:46)
	at reactor.core.publisher.MonoPeek.subscribe(MonoPeek.java:71)
	at reactor.core.publisher.MonoLift.subscribe(MonoLift.java:46)
	at reactor.core.publisher.MonoPeek.subscribe(MonoPeek.java:71)
	at reactor.core.publisher.MonoLift.subscribe(MonoLift.java:46)
	at reactor.core.publisher.MonoDefer.subscribe(MonoDefer.java:53)
	at reactor.core.publisher.MonoLift.subscribe(MonoLift.java:46)
	at reactor.core.publisher.Mono.subscribe(Mono.java:3080)
	at reactor.core.publisher.MonoIgnoreThen$ThenIgnoreMain.drain(MonoIgnoreThen.java:172)
	at reactor.core.publisher.MonoIgnoreThen.subscribe(MonoIgnoreThen.java:56)
	at reactor.core.publisher.MonoLiftFuseable.subscribe(MonoLiftFuseable.java:56)
	at reactor.core.publisher.MonoOnErrorResume.subscribe(MonoOnErrorResume.java:44)
	at reactor.core.publisher.MonoLift.subscribe(MonoLift.java:46)
	at reactor.core.publisher.MonoFlatMap.subscribe(MonoFlatMap.java:60)
	at reactor.core.publisher.MonoLiftFuseable.subscribe(MonoLiftFuseable.java:56)
	at reactor.core.publisher.MonoSubscriberContext.subscribe(MonoSubscriberContext.java:47)
	at reactor.core.publisher.MonoDefer.subscribe(MonoDefer.java:53)
	at reactor.core.publisher.MonoLift.subscribe(MonoLift.java:46)
	at reactor.core.publisher.MonoDefer.subscribe(MonoDefer.java:53)
	at reactor.core.publisher.MonoLift.subscribe(MonoLift.java:46)
	at reactor.core.publisher.MonoPeekTerminal.subscribe(MonoPeekTerminal.java:61)
	at reactor.core.publisher.MonoLiftFuseable.subscribe(MonoLiftFuseable.java:56)
	at reactor.core.publisher.MonoPeekFuseable.subscribe(MonoPeekFuseable.java:74)
	at reactor.core.publisher.MonoLiftFuseable.subscribe(MonoLiftFuseable.java:56)
	at reactor.core.publisher.MonoDefer.subscribe(MonoDefer.java:53)
	at reactor.core.publisher.MonoLift.subscribe(MonoLift.java:46)
	at reactor.core.publisher.MonoDefer.subscribe(MonoDefer.java:53)
	at reactor.core.publisher.MonoLift.subscribe(MonoLift.java:46)
	at reactor.core.publisher.MonoDefer.subscribe(MonoDefer.java:53)
	at reactor.core.publisher.MonoLift.subscribe(MonoLift.java:46)
	at reactor.core.publisher.MonoOnErrorResume.subscribe(MonoOnErrorResume.java:44)
	at reactor.core.publisher.MonoLift.subscribe(MonoLift.java:46)
	at reactor.core.publisher.MonoOnErrorResume.subscribe(MonoOnErrorResume.java:44)
	at reactor.core.publisher.MonoLift.subscribe(MonoLift.java:46)
	at reactor.core.publisher.MonoOnErrorResume.subscribe(MonoOnErrorResume.java:44)
	at reactor.core.publisher.MonoLift.subscribe(MonoLift.java:46)
	at reactor.core.publisher.Mono.subscribe(Mono.java:3080)
	at reactor.core.publisher.MonoIgnoreThen$ThenIgnoreMain.drain(MonoIgnoreThen.java:172)
	at reactor.core.publisher.MonoIgnoreThen.subscribe(MonoIgnoreThen.java:56)
	at reactor.core.publisher.MonoLiftFuseable.subscribe(MonoLiftFuseable.java:56)
	at reactor.core.publisher.MonoPeekFuseable.subscribe(MonoPeekFuseable.java:74)
	at reactor.core.publisher.MonoLiftFuseable.subscribe(MonoLiftFuseable.java:56)
	at reactor.core.publisher.MonoPeekTerminal.subscribe(MonoPeekTerminal.java:61)
	at reactor.core.publisher.MonoLiftFuseable.subscribe(MonoLiftFuseable.java:56)
	at reactor.ipc.netty.channel.ChannelOperations.applyHandler(ChannelOperations.java:380)
	at reactor.ipc.netty.http.server.HttpServerOperations.onHandlerStart(HttpServerOperations.java:398)
	at io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java:163)
	at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:404)
	at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:464)
	at io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:884)
	at java.lang.Thread.run(Thread.java:748)

[snicoll]

@madgnome thanks for the report but it would help to provide more details. Does it happen all the time? Is it broken on upgrade? A simple application we can run ourselves (link to a repo or zip) would be ideal.

[madgnome]

Only happened once so far just after startup.

Unfortunately I don't have a reproducible app, I assume it's a concurrency issue on initialization.

[snicoll]

That's interesting, looks like your heartbeat checks invoke the endpoint when it's not ready to process a request. That vaguely reminds me of something we fixed in the past.

Flagging for team attention.

[mbhave]

Possibly the same fix as #12380