Java Tomcat线程转储
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Tomcat thread dump
提问by Abdullah
Is there away to take a thread dumpfrom Tomcat. I want to monitor the running threads on Tomcat at a certain time.
是否可以从 Tomcat进行线程转储。我想在某个时间监控Tomcat上正在运行的线程。
Note:I was doing that on Web logic but i don't know how it cab be done on Tomcat.
注意：我是在 Web 逻辑上这样做的，但我不知道它是如何在 Tomcat 上完成的。
采纳答案by Julien
If you use Linux, you can send a kill -3 [pid of your tomcat] and it will dump all current threads in the catalina.out.
如果你使用 Linux，你可以发送一个 kill -3 [你的 tomcat 的 pid]，它会转储 catalina.out 中的所有当前线程。
回答by Prabhakaran Ramaswamy
Please try netbeans profiler to profile any web applications.
请尝试使用 netbeans 分析器来分析任何 Web 应用程序。
https://profiler.netbeans.org/
https://profiler.netbeans.org/
回答by olexii
add java melody to your server https://code.google.com/p/javamelody/
将 java melody 添加到您的服务器 https://code.google.com/p/javamelody/
it give you a lot of info including threads in runtime
它为您提供了很多信息，包括运行时的线程
回答by Patrik Bego
There is a simple way to monitor tomcat threads and do a dump. Start tomcat with the folowing java options :
有一种简单的方法可以监控 tomcat 线程并进行转储。使用以下 java 选项启动 tomcat：
-Dcom.sun.management.jmxremote.port=<some free port>
-Dcom.sun.management.jmxremote.ssl=false
-Dcom.sun.management.jmxremote.authenticate=false
After the tomcat is restarted you can simply start jconsole (part of jdk) or visualvm and create a new jmx connection to the port you have chosen above.
In both tools you also have an option to take a dump ;)
重启tomcat后，您可以简单地启动jconsole（jdk的一部分）或visualvm并创建一个新的jmx连接到您在上面选择的端口。
在这两种工具中，您还可以选择进行转储；)
!!!But do that only in closed/secured environment - since there is no authentication set.!!!
!!!但只能在封闭/安全的环境中这样做 - 因为没有设置身份验证。！！！
回答by Guido Medina
The following steps should help you get the current Java threads running and analyze them:
以下步骤应该可以帮助您运行当前的 Java 线程并对其进行分析：
- Download IBM JCA which is a nice thread dump analyzer from IBM Thread & Dump Monitor Analyzer
- Execute the following to get the Tomcat threads dump:
root@localhost:~# sudo -u $TOMCAT_USER $JAVA_HOME/bin/jstack -J-d64 -l $(ps aux | grep '[c]atalina' | awk '{print $2}') > ~/threads.log - Open the threads dump with IBM Thread & Dump Monitor Analyzer
- 从IBM Thread & Dump Monitor Analyzer下载 IBM JCA，这是一个不错的线程转储分析器
- 执行以下命令以获取 Tomcat 线程转储：
root@localhost:~# sudo -u $TOMCAT_USER $JAVA_HOME/bin/jstack -J-d64 -l $(ps aux | grep '[c]atalina' | awk '{print $2}') > ~/threads.log - 使用IBM Thread & Dump Monitor Analyzer打开线程转储
Note:Replace $JAVA_HOMEwith your path to your current JDK, $TOMCAT_USERwith the user running Tomcat; if you pass the wrong user or even using root you will get an error like this:
注意：替换$JAVA_HOME为您当前 JDK 的路径，$TOMCAT_USER用户运行 Tomcat；如果您传递了错误的用户，甚至使用了 root 用户，您将收到如下错误：
3047: well-known file is not secure
