具有应用程序作用域的 CDI Bean 无法识别会话 Bean 的名称

Question

在默认构造函数中的AllUsersBean类中出现错误。它不能识别这一行中的subBean users.add(subBean.clone());我用subBi。clone将用户提交的信息克隆到UsersList(称为users)。谢谢你的建议。

这是错误:

[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.1:compile (default-
compile) on project Test: Compilation failure
[ERROR] ......(here was path to this class) AllUsersBean.java:[25,18] cannot find symbol
[ERROR] symbol:   variable subBean

为了解决这个问题，我试图在UserBean类中添加appBean的getter和setter，但它不起作用。

package testpkg;
/*Importing required java libraries */
import javax.inject.Named; 
import javax.enterprise.context.ApplicationScoped;
import java.util.ArrayList;
import java.util.List;
@Named("appBean")
@ApplicationScoped
public class AllUsersBean {
   private List<UserBean> users;
   public AllUsersBean(){
      users = new ArrayList<UserBean>();
      users.add(subBean.clone());
   }
   public List<UserBean> getUsers() {
      return users;
   }
   public void setUsers(List<UserBean> users) {
      this.users = users;
   }
}

package testpkg;
/*Importing required java libraries */
import java.io.Serializable;
import javax.inject.Named; 
import javax.inject.Inject; 
import javax.enterprise.context.SessionScoped;
@Named("subBean")
@SessionScoped
public class UserBean implements Serializable{
   private String fname;
   @Inject
   private AllUsersBean appBean;
   public UserBean() {
     this.fname = null;
   }
   public String getFname() {
       return fname;
   }
   public void setFname(String fname) {
       this.fname = fname;
   }
    public AllUsersBean getAppbean() {
       return appBean;
   }
   public void setAppbean(AllUsersBean appBean) {
       this.appBean =appBean;
   }
}

Answer 1

您是否尝试过创建一个名为subBean的字段到AllUsersBean并使您在方法中初始化注释@PostConstruct?一般来说，使用克隆并不是一个好的做法