Visual VM 生成和分析线程 dump 文件

曾经终败给现在 2022-09-09 00:23 225阅读 0赞

# 一 代码 #

package chaper02;
    
    /**
    * @className: ThreadDeadLock
    * @description: 线程死锁
    * @date: 2021/8/22
    */
    public class ThreadDeadLock {
        public static void main(String[] args) {
            StringBuilder s1 = new StringBuilder();
            StringBuilder s2 = new StringBuilder();
            new Thread() {
                public void run() {
                    synchronized (s1) {
                        s1.append("a");
                        s2.append("1");
    
    
                        try {
                            Thread.sleep(100);
                        } catch (InterruptedException e) {
                            e.printStackTrace();
                        }
    
    
                        synchronized (s2) {
                            s1.append("b");
                            s2.append("2");
    
    
                            System.out.println(s1);
                            System.out.println(s2);
                        }
                    }
                }
            }.start();
    
            new Thread() {
                public void run() {
                    synchronized (s2) {
                        s1.append("c");
                        s2.append("3");
    
    
                        try {
                            Thread.sleep(100);
                        } catch (InterruptedException e) {
                            e.printStackTrace();
                        }
    
    
                        synchronized (s1) {
                            s1.append("d");
                            s2.append("4");
                            System.out.println(s1);
                            System.out.println(s2);
                        }
                    }
                }
            }.start();
        }
    }

# 二 生成线程 dump 文件 #

![watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBAY2hlbmdxaXVtaW5n_size_20_color_FFFFFF_t_70_g_se_x_16][]

生成后的样子，可在此进行分析。

![watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBAY2hlbmdxaXVtaW5n_size_20_color_FFFFFF_t_70_g_se_x_16 1][]

# 三 保存线程 dump 文件 #

![watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBAY2hlbmdxaXVtaW5n_size_13_color_FFFFFF_t_70_g_se_x_16][]

# 四 读取线程 dump 文件 #

![watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBAY2hlbmdxaXVtaW5n_size_20_color_FFFFFF_t_70_g_se_x_16 2][]

[watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBAY2hlbmdxaXVtaW5n_size_20_color_FFFFFF_t_70_g_se_x_16]: /images/20220829/fa69a8e7e84c44088018cdeea1bbbdff.png
[watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBAY2hlbmdxaXVtaW5n_size_20_color_FFFFFF_t_70_g_se_x_16 1]: /images/20220829/bd63125a8afc480a87c234a8cbb6c179.png
[watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBAY2hlbmdxaXVtaW5n_size_13_color_FFFFFF_t_70_g_se_x_16]: /images/20220829/fb0bf7ed385b4f1983e7665939d3dcf0.png
[watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBAY2hlbmdxaXVtaW5n_size_20_color_FFFFFF_t_70_g_se_x_16 2]: /images/20220829/684dd8c1bbd74dbc91b4a1836dabaef1.png