JEE: Using JSF, Primefaces and p:growl the messages return duplicated (twice).

 

>PROBLEM

Using JSF, Primefaces and p:growl the messages return duplicated (twice).

This kind of issue may have alternative reasons.

On this post it is shown two of them:

- The simple case

and

- The modal case

>SOLUTION #1 - SIMPLE CASE

Find the p:grow element.

Switch the p:growl attribute from:

<p:growl id="growl" showDetail="true"/>

to:

<p:growl id="growl" showDetail="false"/>

Supposing the java code is something like this:

public String remove() {

FacesMessage success = null;

try {

bsn.delete(toEntity());

success = new FacesMessage(FacesMessage.SEVERITY_INFO, "SUCCESS: ID " + this.id + " removed", null);

FacesContext.getCurrentInstance().addMessage(null, success);

clean();

return ModelConfigSvc.SUCCESS;

} catch (BsnException e) {

success = new FacesMessage(FacesMessage.SEVERITY_ERROR, "deletion failed",null);

FacesContext.getCurrentInstance().addMessage(null, success);

return ModelConfigSvc.FAIL;

}

}

or

public String remove() {

FacesMessage success = null;

try {

bsn.delete(toEntity());

FacesContext.getCurrentInstance().addMessage(null, new FacesMessage(FacesMessage.SEVERITY_INFO, "SUCCESS: ID " + this.id + " removed", null));

clean();

return ModelConfigSvc.SUCCESS;

} catch (BsnException e) {

success = new FacesMessage(FacesMessage.SEVERITY_ERROR, "deletion failed",null);

FacesContext.getCurrentInstance().addMessage(null, success);

return ModelConfigSvc.FAIL;

}

}

@SEE: Primefaces docs, Growl

>SOLUTION #2 - MODAL CASE

Scenario:

There is a page that lists entities and it may trigger modal pages to update, delete, etc.
In such cases, the modal message may aggregate to the origin page's message, in this case the listing page.

A fast way to fix this leads us to switch the return value to keep the modal opened and not returning to the listing page, so the message doesn't accumulate twice, one from the modal (p:messages) and the other from the listing page (p:growl).

So, it is changed from:
return ModelConfigSvc.SUCCESS;

To:
return ModelConfigSvc.FAIL;

Below, it is shown the detailed information using the "deletion" to illustrate the example.

Issue to be fixed - doubled messages when the modal is closed after the deletion

THE CODE

faces-config.xhtml

roleList.xhtml

roleDeletion.xhtml exibted as modal

FIXING THE ISSUE

RoleDeletion.java

Return value switched to fix the issue

RoleDeletion.java 

Issue fixed

>ENV

Windows 10

JSF 2.2

WildFly 21