The following error appears randomly (and me not reproduable for me) after:

• shutdown of JBoss
• copy of the ejbca.ear to the jboss-eap-6.2/standalone/deployments/ directory
• start JBoss

WARN [org.jboss.modules] (MSC service thread 1-24) Failed to define class org.apache.myfaces.custom.document.AbstractDocumentTag in Module "deployment.ejbca.ear.adminweb.war:main" from Service Module Loader: java.lang.LinkageError: Failed to link org/apache/myfaces/custom/document/AbstractDocumentTag (Module "deployment.ejbca.ear.adminweb.war:main" from Service Module Loader)
at org.jboss.modules.ModuleClassLoader.defineClass(ModuleClassLoader.java:428) [jboss-modules.jar:1.3.0.Final-redhat-2]
...
at java.lang.Thread.run(Thread.java:744) [rt.jar:1.7.0_51]
Caused by: java.lang.NoClassDefFoundError: javax/faces/webapp/UIComponentTag
at java.lang.ClassLoader.defineClass1(Native Method) [rt.jar:1.7.0_51]
...
at org.jboss.modules.ModuleClassLoader.defineClass(ModuleClassLoader.java:423) [jboss-modules.jar:1.3.0.Final-redhat-2]
... 31 more
Caused by: java.lang.ClassNotFoundException: javax.faces.webapp.UIComponentTag from [Module "deployment.ejbca.ear.adminweb.war:main" from Service Module Loader]
at org.jboss.modules.ModuleClassLoader.findClass(ModuleClassLoader.java:197) [jboss-modules.jar:1.3.0.Final-redhat-2]
...
at org.jboss.modules.ConcurrentClassLoader.loadClass(ConcurrentClassLoader.java:118) [jboss-modules.jar:1.3.0.Final-redhat-2]
... 35 more

We might need to add a jboss-deployment-structure.xml file to ensure that MyFaces is loaded as a dependency instead of when it is found out to be needed.

See also https://docs.jboss.org/author/display/AS7/Implicit+module+dependencies+for+deployments and http://www.jboss.org/schema/jbossas/jboss-deployment-structure-1_0.xsd

Work-around exists: Touching the file (triggering a hot redeploy) solves the problem.