jmx | 易学教程

Analyze Tomcat Heap in detail on a production System

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问题 Having analyzed a light-load web application running in tomcat, using JMX Console, it turns out the "PS Old Gen" is growing slowly but constant. It starts with 200MB and grows around 80MB/Hour. CPU is not an issue, it runs at 0-1% on average, but somewhere it leaks memory, so it will become unstable some days after deployment. How do i find out what objects are allocated on the heap? Are there any good tutorials or tools you know? 回答1: You could try jmap, one of the JDK Development Tools. You

JMX password read access issue

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问题 When I try to use JMX to monitor an application like this: java -Dcom.sun.management.jmxremote.port=9999 \ -Dcom.sun.management.jmxremote.authenticate=false \ -Dcom.sun.management.jmxremote.ssl=false \ JMX_tester it tells me: Error: Password file read access must be restricted: /usr/lib/jvm/java-7-oracle/jre/lib/management/jmxremote.password Yet, when I use chmod to restrict the read access, it tells me: Error: can't read password file Am I going insane or something? How can I fix this? This

Use of JMX and How to use for existing applications

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问题 We have distributed web application developed few years back on JDK 5. How JMX will help this application? 1) Will it help me to monitor performance (Memory, CPU and Network & Disk IO)? 2) If so then application is deployed in multiple servers,how can I monitor in one single dashboard? 3) Do I have to make any new code changes to the existing application or can I monitor without code changes? 4) What else can we do apart from performance monitoring? Because name is Management Extensions (MX)

JBoss目录结构说明

jboss-as 目录结构（Directory Structure） Directory Description bin Contains startup, shutdown and other system-specific scripts. Basically all the entry point JARs and start scripts included with the JBoss distribution are located in the bin directory. 包含了服务器启动，关闭和系统相关的脚本。基本上所有jar文件的进入点和启动脚本都在这个目录里面。 client Stores configuration files and JAR files that may be used by a Java client application (running outside JBoss) or an external web container. You can select archives as required or use jbossall-client.jar . 保存Java客户端应用或外部web容器（在JBoss之外运行），所需的配置文件和Jar文件。 docs Contains the XML DTDs used in JBoss for

Automating jmx files in CircleCI

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问题 I have couple of jmx files which I recorded and downloaded using blazemeter plugin. I would like to know How Can I integrate to CircleCI? How can I set it to run daily? Any help will be highly appreciated. 回答1: When you add a CircleCI project you have a variety of languages to choose from: I would recommend going for Maven(Java) as JMeter Maven Plugin is the easiest option for setting up and using out of other JMeter non-GUI execution options. Organise your project structure as follows:

access Mbeans on weblogic

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问题 From the documentation of oracle : Domain Runtime MBean Server : This MBean server also acts as a single point of access for MBeans that reside on Managed Servers. what i want to do is to use this fact to access all my custom mBeans scattered in several managed servers. for example assume that i have two nodes server-1 server-2 . how can i access all of the custom mBeans on both server-1 server-2 by connecting to the administrator node ? i dont want to remotly access each node to return the

jmeter导入jmx文件报错：missing class com.thoughtworks.xstream.converters.ConversionException

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有的时候我们会参考别人的jmx文件，但是在导入的时候会报错如下图：实际上是告诉我们缺少jar包所引起的，下载对应jar包放到jmeter安装目录对应的lib/ext下就可以了，如下图： jmeter插件下载地址： https://jmeter-plugins.org/downloads/all/ jmeter-plugins-manager.jar是jmeter的一个插件管理工具包，下载完成之后，将下载的jmeter-plugins-manager-0.11.jar文件放置到jmeter目录下\lib\ext目录下面，然后重启JMeter即可，注意，需要重启jmeter~ 注意：如果下载安装了Plugins Manager，在JMeter的选项Option中可以打开Plugins Manager。然后可以对需要的插件进行下载，如下图：想了解更多插件，可参考：https://jmeter-plugins.org JMeter使用lugins插件进行服务器性能监控（参见博客）：https://www.cnblogs.com/zhaoxd07/p/5197669.html 来源： https://www.cnblogs.com/danmai/p/8253922.html

Is it possible with JMX to register or show the MBeans form different VMs in one central MBean server?

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问题 I'm looking for a solution to register the MBeans or the whole MBean Servers itself from different Java VMs in a central MBean Server which should also run in a separate VM. The goal is to have only one central MBean Server which contains all MBeans of the whole System. One additional requirement is and thats the difficulty :-), that the "client" MBean Servers must connect/register to the central MBean Server and not the other way. The central MBean Server don't need any knowledge of the

Change @ManagedResource objectName dynamically

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问题 I am creating prototype beans programatically/dynamically. I want those beans after initiation to be in the jmx console. How I can distinguish between them? I am using anotations in order to add my beans to the jmx and I have @ManagedResource(objectName="bean:name=MybBean") I need to inject the objectName dynamically. Any idea how could I do it? Here's my jmx configuration: <context:mbean-export server="mbeanServer" /> <bean id="mbeanServer" class="org.springframework.jmx.support

How to find out where exact young/old gen is located in memory?

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问题 Recently I was able to get an object's address using sun.misc.Unsafe class. And now I am trying to find programmatically an actual generation where my object is located. For this I want to know the starting and ending points of each generation. If Java (Oracle JVM) provides any tools to resolve this issue? I believe not, since even different GCs require different memory structures (e.g. G1), and this makes the task even more interesting :) What I want to know here is just a couple of numbers