Question

I made a NotificationHandler class, this class contains a static List.
To allow access to this list I made a SessionScopped bean with a getter returning this list.

My problem is the following :

I’m on page A, I put a notification in the list, page A is regenerated, the notification is being displayed.

Then I click on a link in page A sending me to page B.

In page B there is a constructor wich destroy the list.
However the JSF page display the notification BEFORE calling the constructor.

I end up on page B with a notification for page A

Notification handler:

package com.cog.util;

import java.util.ArrayList;
import java.util.List;

public class NotificationHandler {

private static List<Notification2> listeDeNotification = new ArrayList<Notification2>();

public static void flushNotification(){
    listeDeNotification.clear();
}

public static void raiseNotification(NotificationColor color, String code){
    listeDeNotification.add(new Notification2(color.toString(), code));
}

public static void raiseNotification(NotificationColor color, String code, String additionalMessage){
    listeDeNotification.add(new Notification2(color.toString(), code, additionalMessage));
}

public static void addAdditionalMessage(String code, String additionalMessage){
    for(Notification2 n : listeDeNotification){
        if (n.getCode().equals(code)){
            n.setAdditionalMessage(additionalMessage);
        }
    }
}

public static Integer getNotificationNumber(){
    return listeDeNotification.size();
}

public static List<Notification2> getListeDeNotification(){
    return listeDeNotification;
}

}

notificationPrinter.xhtml

<composite:interface>
    <composite:attribute name="liste" />
    <composite:attribute name="locale" />
</composite:interface>

<composite:implementation>
    <ui:repeat value="#{cc.attrs.liste}" varStatus="status" var="l">
        <h:panelGrid width="100%" columns="1">
            <div id="alert" class="alert #{l.color}">
                <button class="close" data-dismiss="alert" type="button">×</button>
                <span class="rt">#{cc.attrs.locale[l.code]} #{l.additionalMessage}</span>
            </div>
        </h:panelGrid>
    </ui:repeat>
</composite:implementation>

AccessorBean

package com.cog.web.beans.util;

import java.util.List;
import javax.faces.bean.ManagedBean;
import javax.faces.bean.SessionScoped;
import com.cog.util.Notification2;
import com.cog.util.NotificationHandler;


@ManagedBean(name = "notificationAccessor")
@SessionScoped
public class NotificationAccessorBean {

    public List<Notification2> getNotificationList(){
        return NotificationHandler.getListeDeNotification();
    }

}

and this is what I put in jsf

problem is I want to flush the notification list betwen some pages only.

Answer 1

Since you are using JSF you can use its advantages (h:commandLink for example) , you can also might use the preRenderView try placing it in your page and use its listener to flush the list

take a look at the following explanation/example JSF 2 PreRenderViewEvent example