1、jmap檢視建立的例項 解決一次Spring註解生成空bean的過程。

原因：ContextLoaderListener和DispatcherServlet 父子關係導致的空bean。

首先檢視埠 FanXin為執行類

檢視目標類例項個數 Student為類名

dump出程序映象

jhat檢視引用關係

登陸localhost：7000 檢視類的引用關係

References to this object:引用該實體類的物件

ce shi dai ma

public class Student {
    private int id;
    private String name;
    public Student(int id,String name){
        this.id=id;
        this.name=name;
    }
    public void setId(int id){
        this.id=id;
    }
    public void setName(String name){
        this.name=name;
    }
    public int getId(){
        return id;
    }
    public String getName(){
        return name;
    }
}
 

public class FanXin {
    private static Student student=new Student(1,"zcl");
    public Student getStudent(){
        return student;
    }
    public static void main(String[]args){
        FanXin fanXin=new FanXin();
        Student student=fanXin.getStudent();
        while(true){
            int id=student.getId();
        }
//        System.out.println(student.getId());
    }
}