Generic exception - Failed to start service jboss.web.deployment in JBoss EAP 6

Issue

• Application is failing to deploy in JBoss EAP 6, the only exception in the log is shown below, however it seems the real exception is being hidden:

17:05:55,964 ERROR [org.apache.catalina.core.StandardContext] (MSC service thread 1-1) Error listenerStart
17:05:55,964 ERROR [org.apache.catalina.core.StandardContext] (MSC service thread 1-1) Context [/test-app] startup failed due to previous errors
17:05:55,978 ERROR [org.jboss.msc.service.fail] (MSC service thread 1-1) MSC000001: Failed to start service jboss.web.deployment.default-host./test-app: org.jboss.msc.service.StartException in service jboss.web.deployment.default-host./test-app: JBAS018040: Failed to start context
    at org.jboss.as.web.deployment.WebDeploymentService.start(WebDeploymentService.java:95)
    at org.jboss.msc.service.ServiceControllerImpl$StartTask.startService(ServiceControllerImpl.java:1811) [jboss-msc-1.0.2.GA-redhat-1.jar:1.0.2.GA-redhat-1]
    at org.jboss.msc.service.ServiceControllerImpl$StartTask.run(ServiceControllerImpl.java:1746) [jboss-msc-1.0.2.GA-redhat-1.jar:1.0.2.GA-redhat-1]
    at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886) [rt.jar:1.6.0_30]
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908) [rt.jar:1.6.0_30]
    at java.lang.Thread.run(Thread.java:662) [rt.jar:1.6.0_30]

• After migrating our application to JBoss EAP 6.0 we are getting the following error, which is not clear as to the problem:

JBAS018040: Failed to start context
  at org.jboss.as.web.deployment.WebDeploymentService.start(WebDeploymentService.java:95)

• Critical logging information is not displayed. When trying to launch our web applications, we occasionally have issues with the application content or configuration, and all we get is a cryptic message telling us the application failed to deploy ("Context [/app] startup failed due to previous errors"). No additional information is provided.

• Even after enable TRACE logging on the root logger of the JBoss Logging we are not getting any useful information.

• How to get more useful logging in order to find the cause of this deployment failure.

• Failed to deploy EJB without any explicit cause (Seam App) , seeing this ERROR in the log:

ERROR [org.apache.catalina.core.StandardContext] (MSC service thread 1-2) Error listenerStart

• My Spring application is not working correctly upon deployment, but I don't know why. I suspect error messages are missing from the log.