⁠9.6. Success messages

Messages are commonly displayed to the user to indicate the success or failure of an action. A JSF FacesMessage is convenient for this function. However, a successful action often requires a browser redirect. Since JSF does not propagate Faces messages across redirects, it is difficult to display success messages in plain JSF.
The built-in conversation-scoped Seam component named facesMessages solves this problem. (This requires the Seam redirect filter.) 
​@Name("editDocumentAction") 
​@Stateless 
​public class EditDocumentBean implements EditDocument 
​{
​    @In EntityManager em; 
​    @In Document document; 
​    @In FacesMessages facesMessages; 
​
​    public String update() 
​    { 
​        em.merge(document); 
​        facesMessages.add("Document updated");  
​    } 
​}
When a message is added to facesMessages, it is used in the next render response phase for the current conversation. Since Seam preserves temporary conversation contexts across redirects, this works even without a long-running conversation.
You can include JSF EL expressions in a Faces message summary: 
​facesMessages.add("Document #{document.title} was updated");
Messages are displayed as: 
​<h:messages globalOnly="true"/>