How to diagnose ClassNotFoundException / NoClassDefFoundError and other classloading issues in JBoss EAP 6 / 7 with Tattletale

Solution Verified - Updated -

Issue

  • How to diagnose ClassNotFoundException issues in JBoss Enterprise Application Platform (JBoss EAP)?
  • How to diagnose NoClassDefFoundError issues in JBoss EAP ?
  • How to diagnose classloading issues in JBoss EAP?
  • How to diagnose ClassCastException issues in JBoss EAP?
  • How to diagnose LinkageError issues in JBoss EAP?
  • How to diagnose NoSuchMethodError issues in JBoss EAP?
  • How to diagnose UnsupportedClassVersionError issues in JBoss EAP?
  • How to diagnose java.lang.InstantiationError issues in JBoss EAP?
  • Our application is failing with a ClassNotFoundException :
...
Caused by: java.lang.ClassNotFoundException: com.jboss.examples.MyClass from [Module "deployment.application.war:main" from Service Module Loader]
...
  • Application is unresponsive. While hitting with request , the application is responding with connection timed out . When we are removing our xfire-all-1.2.6.jar the application is working fine but as soon as we again add the mentioned jar it again shows the same response that is connection timed out.
49 00:06:47,820 ERROR [stderr] (http-/10.10.10.74:80-1) Caused by: java.lang.NoSuchMethodException: com.abc.jkl.xyz.ClassMap()

Environment

  • Red Hat JBoss Enterprise Application Platform (EAP)
    • 7
    • 6

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