如何使用 Jconsole 监控 Java 程序？
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How to monitor a Java program using Jconsole?
提问by Thinker
I have written a program to print number from 1 to 200 using 2 threads.
我编写了一个程序，使用 2 个线程打印从 1 到 200 的数字。
Now I want to monitor this program using JConsole.
现在我想使用 JConsole 监视这个程序。
Basically I want to learn how to use JConsole for monitoring an application.
基本上我想学习如何使用 JConsole 来监控应用程序。
I searched google but couldn't find something useful.
我搜索了谷歌，但找不到有用的东西。
How I can achieve this?
我怎么能做到这一点？
When I started jconsole.exein bin folder. It asks for hostname and port number.
Here in my case, there is none, I guess.
Can somebody guide.
当我jconsole.exe在 bin 文件夹中开始时。它要求提供主机名和端口号。就我而言，我想没有。有人可以指导。
采纳答案by Salah
You need to enable JMXby adding the following JVMarguments :
您需要JMX通过添加以下JVM参数来启用：
-Dcom.sun.management.jmxremote
-Dcom.sun.management.jmxremote.authenticate=false
-Dcom.sun.management.jmxremote.port=8484
-Dcom.sun.management.jmxremote.ssl=false
These parameters will allow any JMXmonitoring tool to access and monitoring your application.
这些参数将允许任何JMX监控工具访问和监控您的应用程序。
Also i suggest you to use visualVMits more powerful tool.
some features for visualVM:
另外我建议你使用visualVM它更强大的工具。一些功能visualVM：
- Provide a CPU profiling.
- Provide all info about Threads.
- Provide the JVM Heap and the memory states.
- Provide Info about the GC activities.
- 提供 CPU 分析。
- 提供有关线程的所有信息。
- 提供 JVM 堆和内存状态。
- 提供有关 GC 活动的信息。
回答by Sandeep Chatterjee
Let's say you have a class Testunder package p1where you have the code to print numbers from 1 to 200 using 2 threads(which you want to monitor).
假设您Test在包p1下有一个类，您可以在其中使用 2 个线程（要监视的线程）打印从 1 到 200 的数字的代码。
So to use jconsolefor monitoring your application, you would need to compile and execute your code first and while your code is executing...
因此，要使用jconsole监视您的应用程序，您需要先编译和执行代码，然后在执行代码时...
Start->Run->jconsole.exeand hit/pressEnter
Select the application which you want to monitor and then click
Connect.
Start->Run->jconsole.exe并点击/按下Enter选择要监控的应用程序，然后单击
Connect。
Alternatively,you can use VisualVMfor this purpose as well.
或者，您也可以为此目的使用VisualVM。
回答by Sonu
JConsole find all the running application at the time of JConsole start-up. Then only the currently running applications port and host will be displayed in the list. So first you need to start the application then start the JConsole.
JConsole 在 JConsole 启动时查找所有正在运行的应用程序。那么列表中将只显示当前运行的应用程序端口和主机。所以首先您需要启动应用程序，然后启动 JConsole。
