Question

我有ManagedBean用于应用程序登录，它是SessionScoped。

@ManagedBean(name="loginBean")
@SessionScoped
public class LoginBean implements Serializable {

   private static final long serialVersionUID = 7765876815540798583L;

   private String username;
   private String password;

   ...

   // getters and setters

有一个FileUploadController，这可以正常工作，包括loginBean注入：

@ManagedBean(name="fileUploadController")
public class FileUploadController implements Serializable {

    private static final long serialVersionUID = 7765485215540798583L;

    @ManagedProperty(value="#{loginBean}")
    private LoginBean loginBean;

    // getters and setters

但我有另一个bean的问题，类似于这个。它被称为FileDownloadController

package com.simulacije.csis.beans;

import java.io.InputStream;
import java.io.Serializable;
import javax.faces.bean.ManagedBean;
import javax.faces.bean.ManagedProperty;
import javax.faces.bean.RequestScoped;
import javax.faces.context.FacesContext;
import javax.servlet.ServletContext;

import org.primefaces.model.DefaultStreamedContent;
import org.primefaces.model.StreamedContent;

@ManagedBean(name="fileDownloadController")
@RequestScoped
public class FileDownloadController implements Serializable {

    private static final long serialVersionUID = 7765876811740798583L;    

    private StreamedContent file;

    @ManagedProperty(value="#{loginBean}")
    private LoginBean loginBean;

    public FileDownloadController() {          
       // File download logic
    }

    public StreamedContent getFile() {
       return file;
    }

    public LoginBean getLoginBean() {
        return loginBean;
    }

    public void setLoginBean(LoginBean loginBean) {
        this.loginBean = loginBean;
    }

}

它会不断触发loginBean的空例外。否则，如果我删除loginBean，下载工作正常，但我需要使其工作。我错过了什么吗？谢谢！

在某些情况下，JSF @ManagedBean未创建

0 个答案: