title: How to know if I am in a postback?
body: <p>I've read in JSF docs that <a href="http://docs.oracle.com/javaee/7/api/javax/faces/render/ResponseStateManager.html" rel="noreferrer"><code>ResponseStateManager</code></a> has a <a href="http://docs.oracle.com/javaee/7/api/javax/faces/render/ResponseStateManager.html#isPostback%28javax.faces.context.FacesContext%29" rel="noreferrer"><code>isPostBack()</code></a> method. How (and where) can I have an instance of <code>ResponseStateManager</code>?</p>