Description of problem:

If a protected JSP page does a redirect and its the originally requested URL, after the IDP redirects the browser back to the SP and replays the original request an IllegalStateException will be thrown when the JSP attempts the redirect (<c:redirect>):

16:25:52,903 ERROR [org.apache.catalina.core.ContainerBase.[jboss.web].[default-host].[/employee].[jsp]] (http-/127.0.0.1:8080-1) JBWEB000236: Servlet.service() for servlet jsp threw exception: java.lang.IllegalStateException
        at org.apache.catalina.connector.ResponseFacade.sendRedirect(ResponseFacade.java:420) [jbossweb-7.5.11.Final-redhat-1.jar:7.5.11.Final-redhat-1]
        at org.apache.taglibs.standard.tag.common.core.RedirectSupport.doEndTag(RedirectSupport.java:152) [jboss-jstl-api_1.2_spec-1.0.6.Final-redhat-1.jar:1.0.6.Final-redhat-1]
        at org.apache.jsp.index_jsp._jspx_meth_c_005fredirect_005f0(index_jsp.java:89)
        at org.apache.jsp.index_jsp._jspService(index_jsp.java:62)
        at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:69) [jbossweb-7.5.11.Final-redhat-1.jar:7.5.11.Final-redhat-1]
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:847) [jboss-servlet-api_3.0_spec-1.0.2.Final-redhat-2.jar:1.0.2.Final-redhat-2]
        at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:365) [jbossweb-7.5.11.Final-redhat-1.jar:7.5.11.Final-redhat-1]
        at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:309) [jbossweb-7.5.11.Final-redhat-1.jar:7.5.11.Final-redhat-1]
        at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:242) [jbossweb-7.5.11.Final-redhat-1.jar:7.5.11.Final-redhat-1]
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:847) [jboss-servlet-api_3.0_spec-1.0.2.Final-redhat-2.jar:1.0.2.Final-redhat-2]
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:295) [jbossweb-7.5.11.Final-redhat-1.jar:7.5.11.Final-redhat-1]
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:214) [jbossweb-7.5.11.Final-redhat-1.jar:7.5.11.Final-redhat-1]
        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:231) [jbossweb-7.5.11.Final-redhat-1.jar:7.5.11.Final-redhat-1]
        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:149) [jbossweb-7.5.11.Final-redhat-1.jar:7.5.11.Final-redhat-1]
        at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:512) [jbossweb-7.5.11.Final-redhat-1.jar:7.5.11.Final-redhat-1]
        at org.jboss.as.web.security.SecurityContextAssociationValve.invoke(SecurityContextAssociationValve.java:169) [jboss-as-web-7.5.4.Final-redhat-4.jar:7.5.4.Final-redhat-4]
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:150) [jbossweb-7.5.11.Final-redhat-1.jar:7.5.11.Final-redhat-1]
        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:97) [jbossweb-7.5.11.Final-redhat-1.jar:7.5.11.Final-redhat-1]
        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:102) [jbossweb-7.5.11.Final-redhat-1.jar:7.5.11.Final-redhat-1]
        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:344) [jbossweb-7.5.11.Final-redhat-1.jar:7.5.11.Final-redhat-1]
        at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:854) [jbossweb-7.5.11.Final-redhat-1.jar:7.5.11.Final-redhat-1]
        at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:653) [jbossweb-7.5.11.Final-redhat-1.jar:7.5.11.Final-redhat-1]
        at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:926) [jbossweb-7.5.11.Final-redhat-1.jar:7.5.11.Final-redhat-1]
        at java.lang.Thread.run(Thread.java:744) [rt.jar:1.7.0_45]

How reproducible:

Modify the employee.war/index.jsp to perform a redirect:

<%@ page contentType="text/html;charset=UTF-8" language="java" %>                                                                                                                                                                              
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>                                                                                                                                                                               
                                                                                                                                                                                                                                               
<!-- Redirects to handle post Cisco Login -->                                                                                                                                                                                                  
<c:redirect url="/blah.html"/>

Steps to Reproduce:
1.  Create the idp and sp security-domains

                <security-domain name="idp" cache-type="default">
                    <authentication>
                        <login-module code="UsersRoles" flag="required">
                            <module-option name="usersProperties" value="${jboss.server.config.dir}/users.properties"/>
                            <module-option name="rolesProperties" value="${jboss.server.config.dir}/roles.properties"/>
                        </login-module>
                    </authentication>
                </security-domain>
                <security-domain name="sp" cache-type="default">
                    <authentication>
                        <login-module code="org.picketlink.identity.federation.bindings.jboss.auth.SAML2LoginModule" flag="required">
                            <module-option name="password-stacking" value="useFirstPass"/>
                        </login-module>
                        <login-module code="UsersRoles" flag="required">
                            <module-option name="password-stacking" value="useFirstPass"/>
                            <module-option name="usersProperties" value="${jboss.server.config.dir}/users.properties"/>
                            <module-option name="rolesProperties" value="${jboss.server.config.dir}/roles.properties"/>
                        </login-module>
                    </authentication>
                </security-domain>


2.  Deploy the idp.war and employee.war
3.  Hit http://localhost:8080/employee/

Actual results:

IllegalStateException

Expected results:

Browser should get redirected to http://localhost:8080/employee/blah.html
Additional info: