Display message from Servlet to JSF page

Question

I'm trying to display success message in xhtml page from servlet but no luck, here's my code In servlet i have

FacesContextFactory contextFactory = (FacesContextFactory)FactoryFinder.getFactory(FactoryFinder.FACES_CONTEXT_FACTORY);
            LifecycleFactory lifecycleFactory = (LifecycleFactory)FactoryFinder.getFactory(FactoryFinder.LIFECYCLE_FACTORY); 
            Lifecycle lifecycle = lifecycleFactory.getLifecycle(LifecycleFactory.DEFAULT_LIFECYCLE); 
            FacesContext facesContext = contextFactory.getFacesContext(request.getSession().getServletContext(), request, response, lifecycle); 
            facesContext.addMessage( "user:displaymessagesave", new FacesMessage("user saved successfully" ));

In xhtml page inside form i have written tag for display message form id=user

<h:message class="success" for="displaymessagesave" id="displaymessagesave" />

Saving to database is happening but its not displaying any message, please suggest where i'm going wrong.

Oscar Pérez · Accepted Answer · 2018-01-12 15:04:30Z

It is not possible to access FacesContext from a servlet other than FacesServlet.

Recently I faced that same problem, and what I did was, on my servlet, put the messages in the Session:

 List<String> msgs=(List<String>)request.getSession().getAttribute(KEY);
 if (msgs==null)
 {
   msgs=new ArrayList<String>();
 }
 msgs.add("My new message");
 request.getSession().setAttribute(KEY, msgs);

Then, on the xhtml view, I added a call to put these messages on FacesContext, and a growl element:

<h:outputText value="#{managed.prepareMessages()}"/>
<p:growl id="growl" showDetail="false" life="4000" />

Finally, the prepareMessages method takes them from session and add the messages to FacesContext:

public String prepareMessages()
{
    List<String> msgs = (List<String>)FacesContext.getCurrentInstance()
                            .getExternalContext().getSessionMap().get(KEY);
    if (msgs!=null)
    {
        for(String msg:msgs)
        {
            FacesContext.getCurrentInstance().addMessage(null,
                                                     new FacesMessage(msg));
        }
        FacesContext.getCurrentInstance().getExternalContext()
                                      .getSessionMap().remove(KEY);
    }
    return "";
}

It may not be an elegant solution, but is the only one I found...

Tushee · Accepted Answer · 2014-04-02 11:34:06Z

0

Don't give the same id for message as the "for" component. If you just want a messageholder without attaching it to a valueholder than you should use the tag.

<h:messages class="success" id="displaymessagesave" />

answered Apr 2, 2014 at 11:34

Tushee

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3 Comments

user2644886 Over a year ago

i tried using only id but still the same its not displaying any message.

Tushee Over a year ago

Have your tried it with h:messages instead of h:message?

Tushee Over a year ago

You also have to update the h:messages component to see the message on the UI.

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