SessionScoped bean created several times

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posted 7 years ago

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Hello all.

I work with Eclipse Mars.2, the system has Java 1.8 update 102 for 64bits but this project uses Java 1.7, JSF Mojarra 2.2, Primefaces 6.0 and Tomcat 7.0.53/7.0.54/8.0.1/8.0.11. I have created the smallest test project in order to show the problem.

The test project consist of 2 pages created with templates, with a menubar on top to browse and a selectOneMenu also on top to select the current language. The current language is stored in a variable in a session bean which is used in both pages and is refreshed every time we change the selectOneMenu. When I run the APP on Tomcat 7.0.53 / Tomcat 8.0.1 or lesser versions it works percfectly, the SessionScoped bean is created just once and the value is kept correctly stored. The problem happens when I run the same APP in Tomcat 7.0.54 / Tomcat 8.0.11 or later versions, in such case the SessionScoped bean is created everytime it is used, and as the current language value is initialized it is always set to the default ( english ).

I have researched a lot and asked in several sites but without any luck. Maybe someone can iluminate me? Thanks a lot in advance!!

As I use templates a page is always composed of head_view.xhtml + index_view.xhtml / page2_view.xhtml + foot_view.xhtml (index_view.xhtml=page2_view.xhtml and the foot part is empty)

Following the test project files:

head_view.xhtml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"
  xmlns:h="http://java.sun.com/jsf/html"
  xmlns:f="http://java.sun.com/jsf/core"
  xmlns:p="http://primefaces.org/ui">
    
  <f:view locale="#{sesion.currentLanguage}">   
    <h:head></h:head>
    <h:body>
        <h:form>
        	<p:selectOneMenu id="selectlanguage" value="#{sesion.selectedLanguage}" converter="languageConverter" var="t" >
                  <f:selectItems value="#{sesion.languages}" var="idi" itemLabel="#{idi.name}" itemValue="#{idi}" />

<p:column>
                      <h:outputText value="#{t.name}" />
                  </p:column>

<p:ajax event="change" listener="#{sesion.changeLanguage}" />
             </p:selectOneMenu>
             
             <p:menubar>

<p:menuitem value="#{msg.btn1}" action="#{headBB.goTo('index')}" />

<p:menuitem value="#{msg.btn2}" action="#{headBB.goTo('page2')}" />

</p:menubar>                                                                                               
        </h:form>
    </h:body>
  </f:view>
</html>

index_view.xhtml

headBB.java

package beans;

import java.io.Serializable;
import javax.faces.bean.ManagedBean;
import javax.faces.bean.RequestScoped;
import javax.faces.context.FacesContext;

@ManagedBean
@RequestScoped
public class HeadBB implements Serializable {

private static final long serialVersionUID = 7510243725613503561L;
	  
    public HeadBB() {
               
    }

public String goTo(String pageName){
    	
    	String url;
    	
		switch (pageName) {
		case "index":
			getsesion().setCurrentPage("index");
			url = "index?faces-redirect=true";
			break;
		case "page2":
			getsesion().setCurrentPage("rent");
			url = "page2?faces-redirect=true";
			break;
		default:
			getsesion().setCurrentPage("index");
			url = "index?faces-redirect=true";
			break;
		}
		
        return url;
    }
       
	public static Sesion getsesion() { 
	    FacesContext context = FacesContext.getCurrentInstance(); 
	    return (Sesion) context.getApplication().evaluateExpressionGet(context, "#{sesion}", Sesion.class);       
	}

}

Language.java

sesion.java

package beans;

import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;
import java.util.Locale;
import javax.annotation.PostConstruct;
import javax.faces.application.NavigationHandler;
import javax.faces.bean.ManagedBean;
import javax.faces.bean.SessionScoped;
import javax.faces.context.FacesContext;

@ManagedBean
@SessionScoped
public class Sesion implements Serializable {

private static final long serialVersionUID = 5845708623625499704L;

private String currentPage = "";
	private Locale currentLanguage;
	private Language selectedLanguage;
	private List<Language> languages;

public Sesion() {
		
	}
	
	@PostConstruct
	public void init() {
		currentPage = "index";
		currentLanguage = new Locale("en", "GB");
		FacesContext.getCurrentInstance().getViewRoot().setLocale(currentLanguage);

languages = new ArrayList<Language>();
		languages.add(new Language("ES", "Espanol"));
		languages.add(new Language("EN", "English"));

selectedLanguage = new Language("EN", "English");
	}
	
	public void changeLanguage() {
		Locale tempLocale = new Locale("en", "GB");
		switch (selectedLanguage.getCode()) {
		case "ES":
			tempLocale = new Locale("es", "ES");
			break;
		default:
			tempLocale = new Locale("en", "GB");
			break;
		}
		FacesContext.getCurrentInstance().getViewRoot().setLocale(tempLocale);
		this.setCurrentLanguage(tempLocale);

// we refresh ALL browsing to the current page
		FacesContext context = FacesContext.getCurrentInstance();
		NavigationHandler navigationHandler = context.getApplication().getNavigationHandler();
		navigationHandler.handleNavigation(context, null, this.currentPage + "?faces-redirect=true");
	}
          //gettes and setters

}

Thanks a lot if you have read all the above! :-)

Rob Spoor

Sheriff