Build a WAR (using enclosed pom.xml ) containing just simple class  SampleServiceApplication.java   and deploy it using Management Console. Everything is fine, a log entry appears - Tracer [class io.jaegertracing.internal.JaegerTracer] registered as global tracer. Disable WAR and enable it after a while (5 seconds is enough). A NullPointerException appears in stacktrace: {"WFLYCTL0080: Failed services" => {"jboss.deployment.unit.\"sampleservice-1.0.0-0-SNAPSHOT.war\".undertow-deployment" => "org.jboss.weld.exceptions.WeldException: WELD-000049 : Unable to invoke private void sampleservice.SampleServiceApplication.doOnPostConstruct() on sampleservice.SampleServiceApplication@1b826106 Caused by: org.jboss.weld.exceptions.WeldException: WELD-000049 : Unable to invoke private void sampleservice.SampleServiceApplication.doOnPostConstruct() on sampleservice.SampleServiceApplication@1b826106 Caused by: java.lang.reflect.InvocationTargetException Caused by: java.lang.NullPointerException: Cannot register GlobalTracer <null>."}}   Tested on WF 21.0.0.Final, may also others are affected.