title: Error using username token in WSO2 Microintegrator 4
body: <p>I am migrating services from EI 6 to MI. These soap services are secured using username token. I have updated the policy with the new library:</p>
  <pre><code>&lt;rampart:tokenStoreClass&gt;org.wso2.micro.integrator.security.extensions.SecurityTokenStore&lt;/rampart:tokenStoreClass&gt;
  </code></pre>
  <p>But I still get the following error when launching a request:</p>
  <pre><code>WARN {Loader} - org.wso2.carbon.security.util.SecurityTokenStore java.lang.ClassNotFoundException: org.wso2.carbon.security.util.SecurityTokenStore
  </code></pre>
  <p>Do I need to do some more updates in the proxy or policy, beside the described above?</p>
  <p>Regards</p>