title: Accessing user attributes using UserAccessor
body: <p>The class com.sap.cloud.sdk.cloudplatform.security.user.UserAccessor allows to me to retrieve the current user and it's attributes.</p>
  
  <p>For example:</p>
  
  <pre><code>    Optional&lt;UserAttribute&gt; optionalfirstName = user.getAttribute("firstname"); 
      UserAttribute ua = optionalfirstName.get(); 
  </code></pre>
  
  <p>Once I have retrieved the UserAttribute, it has two properites "Name" and "Value". However there is no method available to get the Value. How can I access the value? </p>