title: commandButton/commandLink/ajax action/listener method not invoked or input value not set/updated
body: <p>Sometimes, when using <code>&lt;h:commandLink&gt;</code>, <code>&lt;h:commandButton&gt;</code> or <code>&lt;f:ajax&gt;</code>, the <code>action</code>, <code>actionListener</code> or <code>listener</code> method associated with the tag are simply not being invoked. Or, the bean properties are not updated with submitted <code>UIInput</code> values.</p>
  
  <p>What are the possible causes and solutions for this?</p>