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copied!<p>The request parameters are available by <a href="http://docs.oracle.com/javaee/6/api/javax/faces/context/ExternalContext.html#getRequestParameterMap%28%29" rel="nofollow"><code>ExternalContext#getRequestParameterMap()</code></a>.</p> <pre><code>Map<String, String> params = externalContext.getRequestParameterMap(); // ... </code></pre> <p>Or if your application uses same parameter name with multiple values (which is usually the case for <code><h:selectManyXxx></code> components), use <a href="http://docs.oracle.com/javaee/6/api/javax/faces/context/ExternalContext.html#getRequestParameterValuesMap%28%29" rel="nofollow"><code>ExternalContext#getRequestParameterValuesMap()</code></a> instead</p> <pre><code>Map<String, String[]> params = externalContext.getRequestParameterValuesMap(); // ... </code></pre> <p>Please note that this only returns the parameters of the <strong>current</strong> request, not of the initial request in case of postbacks.</p> <p>As to the <a href="http://docs.oracle.com/javaee/6/api/javax/faces/context/ExternalContext.html#getRequest%28%29" rel="nofollow"><code>ExternalContext#getRequest()</code></a>, it returns in case of JSF applications running on a servlet container an instance of <a href="http://docs.oracle.com/javaee/6/api/javax/servlet/http/HttpServletRequest.html" rel="nofollow"><code>HttpServletRequest</code></a> which you'd need to cast, but you should rarely have the need to get it. The <a href="http://docs.oracle.com/javaee/6/api/javax/faces/context/ExternalContext.html" rel="nofollow"><code>ExternalContext</code></a>, while following the Facade design pattern, has a lot of methods which are delegating to the underlying raw HTTP servlet request, session and context. You'd namely ultimately like to end up with <em>zero</em> <code>javax.servlet</code> imports in your backing beans.</p> <hr> <p><strong>Update</strong> as per your comment, you actually want to get only the view parameters which are been registered by <code><f:viewParam></code>. You can get them by <a href="http://docs.oracle.com/javaee/6/api/javax/faces/view/ViewMetadata.html#getViewParameters%28javax.faces.component.UIViewRoot%29" rel="nofollow"><code>ViewMetadata#getViewParameters()</code></a> wherein you pass the current <code>UIViewRoot</code>.</p> <pre><code>Collection<UIViewParameter> viewParameters = ViewMetadata.getViewParameters(FacesContext.getCurrentInstance().getViewRoot()); // ... </code></pre>

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