@SessionScoped does not work when adding @Named

问题

Consider the following backing bean:

import javax.faces.bean.ManagedBean;
import javax.faces.bean.SessionScoped;

@ManagedBean
@SessionScoped
public class Counter {

    int counter;

    public Counter() {
        this.counter = 0;
    }

    public void Increment() {
        this.counter++;
    }

    public void Decrement() {
        this.counter--;
    }

    public int getCounter() {
        return this.counter;
    }

}

I have created a JSF-page that displays the value of the counter and has two buttons to increment and decrement it. It works as expected. However, when I add the annotation javax.inject.Named to the bean, it does not seem to have session scope anymore. The buttons still work (the click is handled on the server-side), but the value of the counter always remains zero. I am using the annotation because in my real application I need to inject other beans into this one, and this annotation seems to be required (please correct me if I am wrong). What is the reason for this behavior? What can I do to work around it?

回答1:

You cannot mix JSF with CDI annotations. Use the one or the other. In this case, you need to import javax.enterprise.context.SessionScoped instead of javax.faces.bean.SessionScoped.

来源：https://stackoverflow.com/questions/6244965/sessionscoped-does-not-work-when-adding-named