I can't make a simple form authentication! Can somebody say me what i am
doing wrong?
I am logging on successfully, but the result Subject is not propagated to
the web container
and on the next page when i am calling

   request.getUserPrincipal();

i am getting null value;

When i doing BASIC instead of FORM authentication everything works fine.

jboss-web.xml
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<jboss-web>
  <security-domain>java:/jaas/role-test</security-domain>
</jboss-web>

login-config.xml
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<application-policy name="role-test">
 <authentication>
  <login-module code="org.jboss.security.auth.spi.UsersRolesLoginModule"
flag="required">
   <module-option name="debug">true</module-option>
  </login-module>
 </authentication>

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web.xml
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  <security-constraint>
       <web-resource-collection>
           <web-resource-name>some resource</web-resource-name>
           <description>Declarative security tests</description>
           <url-pattern>/admin/*</url-pattern>
           <http-method>HEAD</http-method>
           <http-method>GET</http-method>
           <http-method>POST</http-method>
           <http-method>PUT</http-method>
           <http-method>DELETE</http-method>
        </web-resource-collection>
        <auth-constraint>
            <role-name>admin</role-name>
       </auth-constraint>
       <user-data-constraint>
           <description>no description</description>
           <transport-guarantee>NONE</transport-guarantee>
       </user-data-constraint>
   </security-constraint>
<!--
   <login-config>
   <auth-method>BASIC</auth-method>
   <realm-name>role-test2</realm-name>
   </login-config>
-->
   <login-config>
       <auth-method>FORM</auth-method>
       <realm-name>role-test</realm-name>
       <form-login-config>
           <form-login-page>/login.jsp</form-login-page>
           <form-error-page>/error.html</form-error-page>
       </form-login-config>
   </login-config>

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LoginAction.java
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       String username =(String) PropertyUtils.getProperty(form,
"j_username");
       String password = (String)PropertyUtils.getProperty(form,
"j_password");

       SimplePrincipal user =new SimplePrincipal(username);
       SecurityAssociationHandler handler =new
SecurityAssociationHandler();
       handler.setSecurityInfo(user, password.toCharArray());
       LoginContext loginContext = new LoginContext("role-test", handler);
       loginContext.login();

//        Subject subject = loginContext.getSubject();
//        SecurityAssociation.setPrincipal(user);
//        SecurityAssociation.setCredential(password.toCharArray());
//        SecurityAssociation.setSubject(subject);

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