Jboss 7 custom authenticator

I am trying to write my own authenticator which will read particular custom cookies and authenticate user based on token which is stored in that cookie. As an example I took this class: org.jboss.security.negotiation.NegotiationAuthenticator

So I start to writing my own authenticator:

public class SampleAuthenticator extends AuthenticatorBase{

    @Override
    protected boolean authenticate(Request arg0, Response arg1, LoginConfig arg2) throws IOException {
        System.out.println("===CHECK===");
        return false;
    }

As you can see my class contains only needed method that must be implemented with default values.

I have installed this authenticator as module in Jboss "modules" directory.

Then I have added new security-domain in standalone.xml:

<security-domain name="sso" cache-type="default">
                <authentication>
                    <login-module code="UsersRoles" flag="required" />
                </authentication>
</security-domain>

I have made my module as global in standalone.xml as well (in jboss domain subsystem):

<global-modules>
            <module name="com.myexample.authenticator"/>
</global-modules>

Now it seems that my authenticator is ready for use (just for output word "===CHECK===")

Into my example web application I have added jboss-web.xml descriptor:

<jboss-web>
    <security-domain>sso</security-domain>
    <valve>
        <class-name>com.myexample.authenticator.SampleAuthenticator</class-name>
    </valve>
</jboss-web>

My web.xml descriptor is following:

<security-constraint>
    <web-resource-collection>
        <web-resource-name>MyResourceName</web-resource-name>
        <url-pattern>/*</url-pattern>
    </web-resource-collection>
    <auth-constraint>
        <role-name>user</role-name>
    </auth-constraint>
</security-constraint>
<login-config>
    <auth-method>FORM</auth-method>
    <realm-name>My kinda secure web application</realm-name>
</login-config>
<security-role>
    <role-name>user</role-name>
</security-role>

Finally when I am trying to deploy my web application it is throwing this exception:

12:41:28,554 ERROR [org.jboss.msc.service.fail] (MSC service thread 1-2) MSC000001: Failed to start service jboss.web.valve.myvalve: org.jboss.msc.service.StartException in service jboss.web.valve.myvalve: java.lang.ClassCastException: com.myexample.authenticator.SampleAuthenticator cannot be cast to org.apache.catalina.Valve
        at org.jboss.as.web.WebValveService.start(WebValveService.java:92)
        at org.jboss.msc.service.ServiceControllerImpl$StartTask.startService(ServiceControllerImpl.java:1811) [jboss-msc-1.0.4.GA-redhat-1.jar:1.0.4.GA-redhat-1]
        at org.jboss.msc.service.ServiceControllerImpl$StartTask.run(ServiceControllerImpl.java:1746) [jboss-msc-1.0.4.GA-redhat-1.jar:1.0.4.GA-redhat-1]
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) [rt.jar:1.7.0_55]
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) [rt.jar:1.7.0_55]
        at java.lang.Thread.run(Thread.java:744) [rt.jar:1.7.0_55]
Caused by: java.lang.ClassCastException: com.myexample.authenticator.SampleAuthenticator cannot be cast to org.apache.catalina.Valve
        at org.jboss.as.web.WebValveService.start(WebValveService.java:72)
        ... 5 more

I am stuck at this point. I tried to reimplement some authenticators but this ClassCastException is always there.

Can anybody help me with writing own authenticator? I am using Jboss EAP 6.2 with Jboss 7.1.1

The problem was that I was using wrong lib. Problem was solved by using this maven dependency:

<dependency>
            <groupId>org.jboss.as</groupId>
            <artifactId>jboss-as-web</artifactId>
            <version>7.2.0.Final</version>
            <scope>provided</scope>
        </dependency>