Always follow the "caused by" trail of the first excpetion. If you do you will see this:
Caused by: java.lang.ClassNotFoundException: com.sun.identity.authentication.UI.
taglib.DSAMEValueTag from [Module "deployment.das.war:main" from Service Module
Loader]
The missing class is in neither JDK 7 nor JBoss AS 7, so you need to include the JAR file that contains that class in your WAR file.