[jboss-jira] [JBoss JIRA] (WFLY-11760) Race condition when starting the DeploymentMetricService

[James Perkins (Jira)]

James Perkins created WFLY-11760:
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             Summary: 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: Jeff Mesnil


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}



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