Created attachment 939983 [details]
test app

It is caused by missing null value check for CallerPrincipalCallback in authenticate method of WebJASPIAuthenticator.

Steps to reproduce:
1) add following security domain:
<security-domain name="jaspi">
    <authentication-jaspi>
        <auth-module code="org.jboss.as.test.integration.security.jaspi.SuccessAuthModule" flag="required"/>
    </authentication-jaspi>
</security-domain>

2) start standalone server and deploy test.war

3) hit http://localhost:8080/test/SimpleSecuredServlet - you will see NPE in server log:

ERROR [org.apache.catalina.connector] (http-/127.0.0.1:8080-1) JBWEB001018: An exception or error occurred in the container during the request processing: java.lang.NullPointerException
	at org.jboss.as.web.security.jaspi.WebJASPIAuthenticator.authenticate(WebJASPIAuthenticator.java:128) [jboss-as-web-7.5.0.Final-redhat-2.jar:7.5.0.Final-redhat-2]
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:478) [jbossweb-7.5.0.Beta1.jar:7.5.0.Beta1]
	at org.jboss.as.web.security.SecurityContextAssociationValve.invoke(SecurityContextAssociationValve.java:169) [jboss-as-web-7.5.0.Final-redhat-2.jar:7.5.0.Final-redhat-2]
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:145) [jbossweb-7.5.0.Beta1.jar:7.5.0.Beta1]
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:97) [jbossweb-7.5.0.Beta1.jar:7.5.0.Beta1]
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:102) [jbossweb-7.5.0.Beta1.jar:7.5.0.Beta1]
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:344) [jbossweb-7.5.0.Beta1.jar:7.5.0.Beta1]
	at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:855) [jbossweb-7.5.0.Beta1.jar:7.5.0.Beta1]
	at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:653) [jbossweb-7.5.0.Beta1.jar:7.5.0.Beta1]
	at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:926) [jbossweb-7.5.0.Beta1.jar:7.5.0.Beta1]
	at java.lang.Thread.run(Thread.java:745) [rt.jar:1.7.0_55]