添加@Named时，@ SessionScoped不起作用 [英] @SessionScoped does not work when adding @Named

问题描述

考虑以下支持bean:

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;
    }

}

我创建了一个JSF页面，该页面显示计数器的值，并具有两个用于递增和递减的按钮.它按预期工作.但是，当我将注释javax.inject.Named添加到Bean时，它似乎不再具有会话作用域.这些按钮仍然起作用(在服务器端处理单击)，但是计数器的值始终保持为零.我使用注解是因为在我的实际应用程序中，我需要将其他bean注入该注解中，并且似乎需要注解(如果我错了，请更正我).这种行为的原因是什么?我该怎么办才能解决呢?

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?

推荐答案

您不能将JSF与CDI注释混合使用.使用一个或另一个.在这种情况下，您需要导入 javax.enterprise.context.SessionScoped 代替javax.faces.bean.SessionScoped.

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.

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