NullPointerException in RealmBase.hasResourcePermission

Issue

• We see the following NullPointerException when configuring FORM authentication:

ERROR [org.apache.catalina.connector.CoyoteAdapter] (http-/127.0.0.1:8080-1) An exception or error occurred in the container during the request processing: java.lang.NullPointerException
    at org.apache.catalina.realm.RealmBase.hasResourcePermission(RealmBase.java:757) [jbossweb.jar:]
    at org.jboss.as.web.security.JBossWebRealm.hasResourcePermission(JBossWebRealm.java:491) [jboss-as-web-7.1.2.Final-redhat-1.jar:7.1.2.Final-redhat-1]
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:471) [jbossweb.jar:]
    at org.jboss.as.web.security.SecurityContextAssociationValve.invoke(SecurityContextAssociationValve.java:153) [jboss-as-web-7.1.2.Final-redhat-1.jar:7.1.2.Final-redhat-1]
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:155) [jbossweb.jar:]
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) [jbossweb.jar:]
    at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:567) [jbossweb.jar:]
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) [jbossweb.jar:]
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:368) [jbossweb.jar:]
    at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:877) [jbossweb.jar:]
    at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:680) [jbossweb.jar:]
    at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:932) [jbossweb.jar:]
    at java.lang.Thread.run(Thread.java:722) [rt.jar:1.7.0_21]