title: JBoss HelloWorld appilcation doesn't start
body: <p>
  Hi,</p>
  
  <p>I'm trying to start JBoss example application 'jboss-as-helloworld'. 
  And got such exception:</p>
  
  <pre><code>16:23:51,118 INFO  [org.jboss.as.server.deployment] (MSC service thread 1-1) Starting deployment of "jboss-as-helloworld.war"
  16:23:51,176 INFO  [org.jboss.weld] (MSC service thread 1-5) Processing CDI deployment: jboss-as-helloworld.war
  16:23:51,178 ERROR [org.jboss.msc.service.fail] (MSC service thread 1-5) MSC00001: Failed to start service jboss.deployment.unit."jboss-as-helloworld.war".INSTALL: org.jboss.msc.service.StartException in service jboss.deployment.unit."jboss-as-helloworld.war".INSTALL: Failed to process phase INSTALL of deployment "jboss-as-helloworld.war"
      at org.jboss.as.server.deployment.DeploymentUnitPhaseService.start(DeploymentUnitPhaseService.java:121)
      at org.jboss.msc.service.ServiceControllerImpl$StartTask.run(ServiceControllerImpl.java:1765)
      at org.jboss.msc.service.ServiceControllerImpl$ClearTCCLTask.run(ServiceControllerImpl.java:2291)
      at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110) [:1.7.0_02]
      at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603) [:1.7.0_02]
      at java.lang.Thread.run(Thread.java:722) [:1.7.0_02]
  Caused by: org.jboss.msc.service.DuplicateServiceException: Service jboss.naming.context.java.app.jboss-as-helloworld is already registered
      at org.jboss.msc.service.ServiceRegistrationImpl.setInstance(ServiceRegistrationImpl.java:154)
      at org.jboss.msc.service.ServiceControllerImpl.startInstallation(ServiceControllerImpl.java:226)
      at org.jboss.msc.service.ServiceContainerImpl.install(ServiceContainerImpl.java:560)
      at org.jboss.msc.service.ServiceTargetImpl.install(ServiceTargetImpl.java:201)
      at org.jboss.msc.service.ServiceControllerImpl$ChildServiceTarget.install(ServiceControllerImpl.java:2194)
      at org.jboss.msc.service.ServiceTargetImpl.install(ServiceTargetImpl.java:201)
      at org.jboss.msc.service.ServiceControllerImpl$ChildServiceTarget.install(ServiceControllerImpl.java:2194)
      at org.jboss.msc.service.ServiceBuilderImpl.install(ServiceBuilderImpl.java:307)
      at org.jboss.as.ee.naming.ApplicationContextProcessor.deploy(ApplicationContextProcessor.java:62)
      at org.jboss.as.server.deployment.DeploymentUnitPhaseService.start(DeploymentUnitPhaseService.java:115)
      ... 5 more
  
  16:23:51,180 INFO  [org.jboss.as.server.controller] (DeploymentScanner-threads - 2) Deployment of "jboss-as-helloworld.war" was rolled back with failure message {"Failed services" =&gt; {"jboss.deployment.unit.\"jboss-as-helloworld.war\".INSTALL" =&gt; "org.jboss.msc.service.StartException in service jboss.deployment.unit.\"jboss-as-helloworld.war\".INSTALL: Failed to process phase INSTALL of deployment \"jboss-as-helloworld.war\""}}
  16:23:51,191 INFO  [org.jboss.as.server.deployment] (MSC service thread 1-2) Stopped deployment jboss-as-helloworld.war in 10ms
  16:23:51,192 ERROR [org.jboss.as.deployment] (DeploymentScanner-threads - 1) {"Composite operation failed and was rolled back. Steps that failed:" =&gt; {"Operation step-2" =&gt; {"Failed services" =&gt; {"jboss.deployment.unit.\"jboss-as-helloworld.war\".INSTALL" =&gt; "org.jboss.msc.service.StartException in service jboss.deployment.unit.\"jboss-as-helloworld.war\".INSTALL: Failed to process phase INSTALL of deployment \"jboss-as-helloworld.war\""}}}}
  </code></pre>
  
  <p>JBoss 7.0 Runtime Server has started and I can access JBoss start page <code>http://localhost:8080</code> and JBoss console.</p>
  
  <p>I didn't change any code or xml, everything is default.
  Tell me if it is need to provide additional info to investigate this issue.</p>
  
  <p></p>