java Web 应用程序似乎启动了一个名为 [22] 的线程，但未能将其停止。这很可能造成内存泄漏
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A web application appears to have started a thread named [22] but has failed to stop it. This is very likely to create a memory leak
提问by rl99
I have a web application with Servlets in the back end deployed over tomcat. The application is simple java application.
我有一个 Web 应用程序，在后端通过 tomcat 部署了 Servlet。该应用程序是简单的java应用程序。
I see this error frequently in the server logs: SEVERE: A web application appears to have started a thread named [22] but has failed to stop it. This is very likely to create a memory leak.
我经常在服务器日志中看到此错误：严重：Web 应用程序似乎已启动名为 [22] 的线程，但未能将其停止。这很可能造成内存泄漏。
Are there any potential reasons which might be causing it?
是否有任何可能导致它的潜在原因？
采纳答案by duffymo
I'd use visualvm 1.3.2and see what threads are being created. Be sure to add all the plug-ins.
我会使用visualvm 1.3.2并查看正在创建哪些线程。请务必添加所有插件。
If it's not being done by your code you won't have much control over it.
如果它不是由您的代码完成的，您将无法对其进行太多控制。
You also don't know if the message is a red herring or not. Load test your code over a period of time and measure what happens.
您也不知道该消息是否是红鲱鱼。在一段时间内对您的代码进行负载测试并测量会发生什么。
回答by Vipin
I faced similar situation recently Resolved in below steps
我最近遇到了类似的情况，按以下步骤解决
- I took Thread dump. ( using Kill -QUIT pid )
- Found the Runnable/Thread class form dump
- Then i put a debug point in run method and started application in debug mode.
- Got the code which starts My Thread and I observed it was not stopped while stoping application.
- Introduced code to stop the thread in contextDestroyed method of AppContextListener (This is My application class which extends ServletContextListener ) as this method will be called when i stop tomcat.
- 我拿了线程转储。（使用 Kill -QUIT pid ）
- 找到 Runnable/Thread 类表单转储
- 然后我在 run 方法中放置了一个调试点并以调试模式启动应用程序。
- 得到了启动我的线程的代码，我观察到它在停止应用程序时没有停止。
- 引入了在 AppContextListener 的 contextDestroyed 方法中停止线程的代码（这是我的应用程序类，它扩展了 ServletContextListener ），因为当我停止 tomcat 时将调用此方法。
If you set Thread as Dameon Thread it is not going to help , you can visit explanation.
如果您将 Thread 设置为 Dameon Thread 则无济于事，您可以访问解释。
回答by Guy
Tomcat waits for all the application's threads (user threads not daemon threads) to stop before it goes down, I guess that in your case this specific thread is a user thread and therefore tomcat generated this error. I suggest you to change this thread to daemon (assuming this one is yours)
Tomcat 等待所有应用程序的线程（用户线程而不是守护线程）在它关闭之前停止，我猜在你的情况下这个特定线程是一个用户线程，因此 tomcat 生成了这个错误。我建议您将此线程更改为守护进程（假设这是您的）
