JSF 2.0从另一个Bean访问Application Scope Bean [英] JSF 2.0 Accessing Application Scope bean from another Bean

问题描述

我正在使用jsf 2.0，并且有两个bean导航(Application Scope)和模块(Request Scope).我想在Module Bean中使用Navigation Bean的方法.我就是这样 在模块Bean中

I am using jsf 2.0 and I have two bean Navigation (Application Scope ) and Module (Request Scope). I want to use methods of Navigation bean in Module Bean. I am doing in this way In Module Bean

 @ManagedProperty(value = "#{navigationBean}")
    private NavigationBean navigationBean;

但是当我尝试获取navigationBean.SomeMethod时，它不能正常工作，因为导航bean为null.该怎么做?

But when I am trying to get navigationBean.SomeMethod it is not working as navigation bean is null . How to do this?

推荐答案

两个bean都必须是完整的@ManagedBean.接受者应该对注入的bean有一个公共的setter方法.注入的Bean仅在@PostConstruct及更高版本中可用(即，在所有正常事件方法中均可用，因此在接受器的构造函数中不).

The both beans needs to be a fullworthy @ManagedBean. The acceptor should have a public setter method for the injected bean. The injected bean is only available in @PostConstruct and beyond (i.e. in all normal event methods, but thus not in the constructor of the acceptor).

所以，这应该起作用:

@ManagedBean
@ApplicationScoped
public class Navigation {
    // ...
}

---

@ManagedBean
@RequestScoped
public class Module {

    @ManagedProperty(value="#{navigation}")
    private Navigation navigation;

    @PostConstruct
    public void init() {
        navigation.doSomething();
    }

    public void setNavigation(Navigation navigation) {
        this.navigation = navigation;
    }

}

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