title: How concatenate two string in Spring Expression Language (SpEL)
body: <p>In my spring application, the methods from my controller and service classes have this annotation to security purposes:</p>
  
  <pre><code>@PreAuthorize("hasPermission(#user, 'cadastra')")
  </code></pre>
  
  <p>the second argument, the permission, should have this format:</p>
  
  <pre><code>&lt;&lt;action_name&gt;&gt;_&lt;&lt;class_name&gt;&gt;
  </code></pre>
  
  <p>What expression I should use to accomplish that, taking in consideration the class name is held by <code>this.getClass().getName()</code>?</p>