title: How to concatenate Strings in EL expression?
body: <p>I need to create a callback for <code>&lt;h:commandButton&gt;</code> while as a parameter I need to pass an argument that is string-concatenated with an external parameter id:</p>
  
  <p>I tried nesting an EL expression something like this:</p>
  
  <pre><code>&lt;h:commandButton ... action="#{someController.doSomething('#{id}SomeTableId')}" /&gt;
  </code></pre>
  
  <p>However this failed with an EL exception. What is a right syntax/approach to do this?</p>