Race condition when starting the DeploymentMetricService -------------------------------------------------------- Key: WFLY-11760 URL: https://issues.jboss.org/browse/WFLY-11760 Project: WildFly Issue Type: Bug Components: MP Metrics Reporter: James Perkins Assignee: Richard Opalka Priority: Major It looks like there is a race condition that produces an NPE in the {{DeploymentMetricService}}. The {{MetricsRegistrationService}} asynchronously starts {{MetricCollector}} and for some reason the {{Supplier}} returns {{null}} even though there is a service dependency. {code} 11:42:18,814 ERROR [org.jboss.msc.service.fail] (MSC service thread 1-3) MSC000001: Failed to start service jboss.deployment.unit."simple-servlet.war".metrics: org.jboss.msc.service.StartException in service jboss.deployment.unit."simple-servlet.war".metrics: Failed to start service at org.jboss.msc.service.ServiceControllerImpl$StartTask.execute(ServiceControllerImpl.java:1730) at org.jboss.msc.service.ServiceControllerImpl$ControllerTask.run(ServiceControllerImpl.java:1558) at org.jboss.threads.ContextClassLoaderSavingRunnable.run(ContextClassLoaderSavingRunnable.java:35) at org.jboss.threads.EnhancedQueueExecutor.safeRun(EnhancedQueueExecutor.java:1982) at org.jboss.threads.EnhancedQueueExecutor$ThreadBody.doRunTask(EnhancedQueueExecutor.java:1486) at org.jboss.threads.EnhancedQueueExecutor$ThreadBody.run(EnhancedQueueExecutor.java:1377) at java.lang.Thread.run(Thread.java:748) Caused by: java.lang.NullPointerException at org.wildfly.extension.microprofile.metrics.MetricsRegistrationService.registerMetrics(MetricsRegistrationService.java:162) at org.wildfly.extension.microprofile.metrics.deployment.DeploymentMetricService.start(DeploymentMetricService.java:55) at org.jboss.msc.service.ServiceControllerImpl$StartTask.startService(ServiceControllerImpl.java:1738) at org.jboss.msc.service.ServiceControllerImpl$StartTask.execute(ServiceControllerImpl.java:1700) ... 6 more {code}