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copied!<p>The components <code><h:message></code> and <code><h:messages></code> are dedicated to display messages to users (generally error message).</p> <p>For example, when you have a validation on a field that failed (for example the user didn't fill a required field, or inputed a string in a number-only field), then a <code>FacesMessage</code> is added to the <code>FacesContext</code> object. The <code><h:message></code> and <code><h:messages></code> are then used to display the message in the page.</p> <p>The component <code><h:messages></code> will display all the messages contained in the <code>FacesContext</code>, while the <code><h:message></code> is dedicated to a specific clientId (a specific field). The latter is usefull when you want to place the message close to a field for example.</p> <p>Note that you can add any kind of message that will displayed to the user:</p> <pre><code>FacesContext.getInstance().addMessage(null, new FacesMessage("The message to display")); </code></pre> <p>In this example, the first parameter is the ID field of the field that is concerned by this message (usefull when the message is a validation message for a specific field). <code>null</code> means that the message is a general information (i.e. not linked to any particular field).</p> <p>You can see an example of this component <a href="http://livedemo.exadel.com/richfaces-demo/richfaces/messages.jsf" rel="noreferrer">here</a>. Note that this example uses the <code>rich:messages</code> that is an extension (provided by RichFaces) of the "basic" <code><h:message/></code>, but the principle is the same.</p>

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