Start the attached boot application. Hit http://localhost:8080/actuator/health/readiness and you should see the the NPE below. config-map-demo.zip
java.lang.NullPointerException: null
at org.springframework.boot.actuate.health.SimpleStatusAggregator.contains(SimpleStatusAggregator.java:76) ~[spring-boot-actuator-2.3.0.BUILD-20200428.104559-600.jar:2.3.0.BUILD-SNAPSHOT]
at java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:174) ~[na:1.8.0_91]
at java.util.HashMap$KeySpliterator.forEachRemaining(HashMap.java:1540) ~[na:1.8.0_91]
at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:481) ~[na:1.8.0_91]
at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:471) ~[na:1.8.0_91]
at java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:708) ~[na:1.8.0_91]
at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) ~[na:1.8.0_91]
at java.util.stream.ReferencePipeline.reduce(ReferencePipeline.java:479) ~[na:1.8.0_91]
at java.util.stream.ReferencePipeline.min(ReferencePipeline.java:520) ~[na:1.8.0_91]
at org.springframework.boot.actuate.health.SimpleStatusAggregator.getAggregateStatus(SimpleStatusAggregator.java:72) ~[spring-boot-actuator-2.3.0.BUILD-20200428.104559-600.jar:2.3.0.BUILD-SNAPSHOT]
at org.springframework.boot.actuate.health.HealthEndpointSupport.getCompositeHealth(HealthEndpointSupport.java:132) ~[spring-boot-actuator-2.3.0.BUILD-20200428.104559-600.jar:2.3.0.BUILD-SNAPSHOT]
at org.springframework.boot.actuate.health.HealthEndpointWebExtension.aggregateContributions(HealthEndpointWebExtension.java:91) ~[spring-boot-actuator-2.3.0.BUILD-20200428.104559-600.jar:2.3.0.BUILD-SNAPSHOT]
at org.springframework.boot.actuate.health.HealthEndpointWebExtension.aggregateContributions(HealthEndpointWebExtension.java:44) ~[spring-boot-actuator-2.3.0.BUILD-20200428.104559-600.jar:2.3.0.BUILD-SNAPSHOT]
at org.springframework.boot.actuate.health.HealthEndpointSupport.getAggregateHealth(HealthEndpointSupport.java:120) ~[spring-boot-actuator-2.3.0.BUILD-20200428.104559-600.jar:2.3.0.BUILD-SNAPSHOT]
at org.springframework.boot.actuate.health.HealthEndpointSupport.getContribution(HealthEndpointSupport.java:96) ~[spring-boot-actuator-2.3.0.BUILD-20200428.104559-600.jar:2.3.0.BUILD-SNAPSHOT]
at org.springframework.boot.actuate.health.HealthEndpointSupport.getHealth(HealthEndpointSupport.java:74) ~[spring-boot-actuator-2.3.0.BUILD-20200428.104559-600.jar:2.3.0.BUILD-SNAPSHOT]
at org.springframework.boot.actuate.health.HealthEndpointSupport.getHealth(HealthEndpointSupport.java:59) ~[spring-boot-actuator-2.3.0.BUILD-20200428.104559-600.jar:2.3.0.BUILD-SNAPSHOT]
at org.springframework.boot.actuate.health.HealthEndpointWebExtension.health(HealthEndpointWebExtension.java:71) ~[spring-boot-actuator-2.3.0.BUILD-20200428.104559-600.jar:2.3.0.BUILD-SNAPSHOT]
at org.springframework.boot.actuate.health.HealthEndpointWebExtension.health(HealthEndpointWebExtension.java:66) ~[spring-boot-actuator-2.3.0.BUILD-20200428.104559-600.jar:2.3.0.BUILD-SNAPSHOT]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_91]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_91]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_91]
at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_91]
at org.springframework.util.ReflectionUtils.invokeMethod(ReflectionUtils.java:282) ~[spring-core-5.2.6.BUILD-20200428.052853-104.jar:5.2.6.BUILD-SNAPSHOT]
at org.springframework.boot.actuate.endpoint.invoke.reflect.ReflectiveOperationInvoker.invoke(ReflectiveOperationInvoker.java:77) ~[spring-boot-actuator-2.3.0.BUILD-20200428.104559-600.jar:2.3.0.BUILD-SNAPSHOT]
at org.springframework.boot.actuate.endpoint.annotation.AbstractDiscoveredOperation.invoke(AbstractDiscoveredOperation.java:60) ~[spring-boot-actuator-2.3.0.BUILD-20200428.104559-600.jar:2.3.0.BUILD-SNAPSHOT]
at org.springframework.boot.actuate.endpoint.web.servlet.AbstractWebMvcEndpointHandlerMapping$ServletWebOperationAdapter.handle(AbstractWebMvcEndpointHandlerMapping.java:305) ~[spring-boot-actuator-2.3.0.BUILD-20200428.104559-600.jar:2.3.0.BUILD-SNAPSHOT]
at org.springframework.boot.actuate.endpoint.web.servlet.AbstractWebMvcEndpointHandlerMapping$OperationHandler.handle(AbstractWebMvcEndpointHandlerMapping.java:388) ~[spring-boot-actuator-2.3.0.BUILD-20200428.104559-600.jar:2.3.0.BUILD-SNAPSHOT]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_91]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_91]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_91]
at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_91]
at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:190) ~[spring-web-5.2.6.BUILD-20200428.052853-101.jar:5.2.6.BUILD-SNAPSHOT]
at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:138) ~[spring-web-5.2.6.BUILD-20200428.052853-101.jar:5.2.6.BUILD-SNAPSHOT]
at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:105) ~[spring-webmvc-5.2.6.BUILD-20200428.052853-101.jar:5.2.6.BUILD-SNAPSHOT]
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:879) ~[spring-webmvc-5.2.6.BUILD-20200428.052853-101.jar:5.2.6.BUILD-SNAPSHOT]
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:793) ~[spring-webmvc-5.2.6.BUILD-20200428.052853-101.jar:5.2.6.BUILD-SNAPSHOT]
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87) ~[spring-webmvc-5.2.6.BUILD-20200428.052853-101.jar:5.2.6.BUILD-SNAPSHOT]
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1040) ~[spring-webmvc-5.2.6.BUILD-20200428.052853-101.jar:5.2.6.BUILD-SNAPSHOT]
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:943) ~[spring-webmvc-5.2.6.BUILD-20200428.052853-101.jar:5.2.6.BUILD-SNAPSHOT]
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006) ~[spring-webmvc-5.2.6.BUILD-20200428.052853-101.jar:5.2.6.BUILD-SNAPSHOT]
at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:898) ~[spring-webmvc-5.2.6.BUILD-20200428.052853-101.jar:5.2.6.BUILD-SNAPSHOT]
at javax.servlet.http.HttpServlet.service(HttpServlet.java:634) ~[tomcat-embed-core-9.0.33.jar:9.0.33]
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883) ~[spring-webmvc-5.2.6.BUILD-20200428.052853-101.jar:5.2.6.BUILD-SNAPSHOT]
at javax.servlet.http.HttpServlet.service(HttpServlet.java:741) ~[tomcat-embed-core-9.0.33.jar:9.0.33]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231) ~[tomcat-embed-core-9.0.33.jar:9.0.33]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.33.jar:9.0.33]
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53) ~[tomcat-embed-websocket-9.0.33.jar:9.0.33]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.33.jar:9.0.33]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.33.jar:9.0.33]
at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100) ~[spring-web-5.2.6.BUILD-20200428.052853-101.jar:5.2.6.BUILD-SNAPSHOT]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.2.6.BUILD-20200428.052853-101.jar:5.2.6.BUILD-SNAPSHOT]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.33.jar:9.0.33]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.33.jar:9.0.33]
at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93) ~[spring-web-5.2.6.BUILD-20200428.052853-101.jar:5.2.6.BUILD-SNAPSHOT]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.2.6.BUILD-20200428.052853-101.jar:5.2.6.BUILD-SNAPSHOT]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.33.jar:9.0.33]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.33.jar:9.0.33]
at org.springframework.boot.actuate.metrics.web.servlet.WebMvcMetricsFilter.doFilterInternal(WebMvcMetricsFilter.java:93) ~[spring-boot-actuator-2.3.0.BUILD-20200428.104559-600.jar:2.3.0.BUILD-SNAPSHOT]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.2.6.BUILD-20200428.052853-101.jar:5.2.6.BUILD-SNAPSHOT]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.33.jar:9.0.33]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.33.jar:9.0.33]
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201) ~[spring-web-5.2.6.BUILD-20200428.052853-101.jar:5.2.6.BUILD-SNAPSHOT]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.2.6.BUILD-20200428.052853-101.jar:5.2.6.BUILD-SNAPSHOT]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.33.jar:9.0.33]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.33.jar:9.0.33]
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202) ~[tomcat-embed-core-9.0.33.jar:9.0.33]
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96) [tomcat-embed-core-9.0.33.jar:9.0.33]
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:541) [tomcat-embed-core-9.0.33.jar:9.0.33]
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139) [tomcat-embed-core-9.0.33.jar:9.0.33]
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92) [tomcat-embed-core-9.0.33.jar:9.0.33]
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74) [tomcat-embed-core-9.0.33.jar:9.0.33]
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343) [tomcat-embed-core-9.0.33.jar:9.0.33]
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:373) [tomcat-embed-core-9.0.33.jar:9.0.33]
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65) [tomcat-embed-core-9.0.33.jar:9.0.33]
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:868) [tomcat-embed-core-9.0.33.jar:9.0.33]
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1594) [tomcat-embed-core-9.0.33.jar:9.0.33]
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) [tomcat-embed-core-9.0.33.jar:9.0.33]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) [na:1.8.0_91]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [na:1.8.0_91]
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) [tomcat-embed-core-9.0.33.jar:9.0.33]
at java.lang.Thread.run(Thread.java:745) [na:1.8.0_91]
Comment From: ryanjbaxter
Problem only seems to occur in snapshots right now, it does not occur when using M4
Comment From: spencergibb
That's so odd. AvailabilityProbesHealthEndpointGroup.getStatusAggregator() returns StatusAggregator.DEFAULT, but when StatusAggregator.DEFAULT = = new SimpleStatusAggregator() is called SimpleStatusAggregator.DEFAULT_ORDER hasn't been statically initialized yet, so it is null. It is called AFTER the constructor.
Comment From: ryanjbaxter
I noticed that there were two instance of SimpleStatusAggregator being created. That seemed odd to me. One was created early on and like you said SimpleStatusAggregator.DEFAULT_ORDER was not initialized and that was what was used when hitting the endpoints.
I didnt dig further than that though
Comment From: bclozel
Thanks for the report @ryanjbaxter - it turned out to be a strange issue and our tests and integration tests didn't find it because the class loading order matters to trigger that bug.
Comment From: ryanjbaxter
@bclozel thanks I will give snapshots a try again!