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Editorial Team
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Asked: 2026-05-26T07:17:45+00:00

how to move a variable’s value from jsf’s bean page (i.e, bean.java) to another

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how to move a variable’s value from jsf’s bean page (i.e, bean.java) to another java class? when i tried to do that, the value assinged to the variable in the second java class is NULL.,

I have used primefaces UI framework(something like jsf) and assigned every fields value in to a bean class. the value assigned to every variable in bean class is proper. but when i tried to move those values to another .java file. The scope of the variable dies, and the value is NULL. Check out my codings..

LOGIN.XHTML

<!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:ui="http://java.sun.com/jsf/facelets"
xmlns:h="http://java.sun.com/jsf/html"
xmlns:f="http://java.sun.com/jsf/core"
xmlns:p="http://primefaces.prime.com.tr/ui">


<h:head></h:head>
<h:body>

<p:panel header="Login" style="">
<h:form>

<h:panelGrid columns="2" cellpadding="2">
<h:outputText value="Username"></h:outputText>
<p:inputText id="userName" value="#{loginBean.userName}"></p:inputText>
<h:outputText value="Password"></h:outputText>
<p:password id="password" value="#{loginBean.password}"></p:password>
<p:commandButton value="Sign in" ajax="false" actionListener="#{loginBean.forward}"></p:commandButton>



</h:panelGrid>

</h:form> 

</p:panel>
</h:body>


</html>

loginBean.java

package bean;
import receive.*;
public class loginBean {
public String userName;
public String password;
public String getUserName() {
return userName;
}
public void setUserName(String userName) {
this.userName = userName;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public void forward()
{
System.out.println(getUserName());
receiveclass r=new receiveclass();
r.dbc();
}
}

receiveclass.java

package receive;
import bean.loginBean; 
public class receiveclass {
loginBean lb=new loginBean();

public void dbc()
{
  String s= lb.getUserName();
  String p=lb.getPassword();
  System.out.println(s);
  System.out.println(p);
  //System.out.println("hi");

}

}

output is,

if i give as admin, admin in text fields

i am receiving as

admin
null
null

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1 Answer

  1. Editorial Team

    You’re manually creating the beans instead of letting JSF manage the beans. Manually created beans won’t be used by JSF at all. You need to let JSF auto-create and manage those beans. You can access other JSF managed beans by injecting it as @ManagedProperty:

    In your particular case, the following should work:

    @ManagedBean
@RequestScoped
public class LoginBean {

    private String userName;
    private String password;

    @ManagedProperty
    private ReceiveClass receiveClass;

    public void forward() {
        receiveClass.dbc(this);
    }

    // Add/generate getters and setters.
}

    with

    @ManagedBean
@SessionScoped
public class ReceiveClass {

    public void dbc(LoginBean loginBean) {
        System.out.println(loginBean.getUserName());
    }

}

    (Note that I fixed the code to adhere the Java Naming Conventions properly. Class names ought to start with uppercase)

    See also:

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