I have a Linux server where I'm running WildFly 10. I work on a Windows machine and I want to profile the remote application server. I've checked that port 9990 is enabled for access via http by accessing http://:9990/console and via JMX access from the JConsole client that comes in WildFly. For the latter, I downloaded WildFly to my machine, went to %WILDFLY_PATH%\bin\jconsole.bat, accesed through service:jmx:http-remoting-jmx://:9990 and used my credentials, it works properly. Now I want to access va JMC, but I cannot achieve it. I tried the following:
I tried access with VisualVM and worked using the last approach but replaced jmc.exe by jvisualvm.exe and I connected to the external VM with no issues. I wonder if there's any way to achieve this using JMC.
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Oracle Java Mission Control was originally included with JRockit and then bundled with the HotSpot JVM since Java 7 Update 40 release.
This tool is specially helpful when dealing with consistent performance issues, easily replicated.
A JFR file provides a view of the execution of a Java process using Oracle Java Mission Control (/bin/jmc or jmc.exe in Windows) available with the JDK from different perspectives allowing to review the CPU, heap size, GC work, IO metrics, thread dumps, events, etc. The problem can be isolated using operative set and adjusting the time line between other interesting features.
In this Document
PurposeTroubleshooting Steps Recording Modes 1) Startup the WLS instance with JFR options 2) Set built-in diagnostic module to High 3) Restart the WLS instance 4) Collect the JFR file Profiling/Continuos Recording - GUI mode JFR via Console Mode Thread Dump Interval Collecting a JFR File - Profiling Recording Collecting a JFR File - Continuous Recording 5) Other usages of the JCMD command 6) Analysis of JFR files My Oracle Support provides customers with access to over a million knowledge articles and a vibrant support community of peers and Oracle experts.
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Then you can start and stop it using command-line tools without affecting CQ. The output is a file with the .jfr extension which can be read and analysed by the "Java Mission Control" (%JAVA_HOME%\bin\jmc.exe) visual tool.
JMX (Java Management Extensions) allows to change the bean field values or invoke bean methods on the fly at runtime. It is in opposite to DI where you configure application when it starts, using profiles or classpath. With JMX you can tune, monitor or configure your application anytime when it is running.
At the heart of JMX are MBeans. MBean is a JavaBean that exposes certain methods that define the management interface. To make of those exposed methods you can use tool of your choice. My choice is Java Mission Control. Others are VisualVM or JConsole.
The return value of that method will be managed by JMX. You can run the app from my GitHub sources and access that resource at :8080/api/my-jmx-value. The default hardcoded value of 25 will be returned and displayed in your browser.
Java Mission Control (JMC) is a tool you can find in your jdk/bin folder under the jmc.exe name. With JMC you can monitor java process health and manage MBeans. See image below to get familiar with the tool and see how to find your MBean there:
1. run the JMC and under the list of local java processes find your app and connect to its MBean Server
2. go to MBean Browser tab and find jmxDemo domain
3. under MyController you can set the MyJmxValue attribute to any nymber you want
4. go to :8080/api/my-jmx-value and test that the returned value is exactly how you set it
Thread dumps are vital artifacts to diagnose CPU spikes, deadlocks, memory problems, unresponsive applications, poor response times, and other system problems. There are great online thread dump analysis tools that can analyze and spot problems. But for those tools, you need to provide proper thread dumps as input. Thus, in this article, I have documented nine different options to capture thread dumps.
Launch the jvisualvm. On the left panel, you will notice all the Java applications that are running on your machine. You need to select your application from the list (see the red color highlight in the below diagram). This tool also has the capability to capture thread dumps from the java processes that are running in remote hosts as well.
Java Mission Control (JMC) is a tool that collects and analyzes data from Java applications running locally or deployed in production environments. This tool has been packaged into JDK since Oracle JDK 7 Update 40. This tool also provides an option to take thread dumps from the JVM. JMC tool is present in JDK_HOME\bin\jmc.exe
Since JDK 1.5 ThreadMXBean has been introduced. This is the management interface for the thread system in the Java Virtual Machine. Using this interface, you can generate thread dumps. You only have to write a few lines of code to generate thread dumps programmatically. Below is a skeleton implementation on ThreadMXBean implementation, which generates a Thread dump from the application.
Few Application Performance Monitoring tools provide options to generate thread dumps. If you are monitoring your application through App Dynamics (APM tool), below are the instructions to capture thread dump:
1. Create an action, selecting Diagnostics->Take a thread dump in the Create Action window.
2. Enter a name for the action, the number of samples to take, and the interval between the thread dumps in milliseconds.
3. If you want to require approval before the thread dump action can be started, check the Require approval before this Action checkbox and enter the email address of the individual or group that is authorized to approve the action. See Actions Requiring Approval for more information.
4. Click OK.
Tengo un servidor Linux donde estoy ejecutando WildFly 10. Trabajo en un equipo Windows y quiero evaluar el rendimiento del servidor de aplicaciones remoto. He verificado que el puerto 9990 est habilitado para acceder mediante http con la URL http://:9990/console y mediante JMX desde el cliente JConsole que viene en WildFly. Para este ltimo, descargu WildFly a mi equipo, ejecut %WILDFLY_PATH%\bin\jconsole.bat, me conect utilizando service:jmx:http-remoting-jmx://:9990 y mis credenciales, funciona perfecto. Ahora quiero acceder mediante JMC, pero no puedo lograrlo. Lo que intent:
Intent acceder con VisualVM y funcion utilizando el ltimo mtodo pero reemplazando jmc.exe por jvisualvm.exe y pude conectarme a la VM remota sin problemas. Me pregunto si hay alguna manera de lograrlo con JMC.
Luego de por fin encontrar la documentacin de JMC (porque el enlace a la documentacin desde el sitio oficial de JMC est roto), en la parte final pude dar con la seccin de Preguntas Frecuentes que explica cmo conectarse a JBoss (al parecer no soy el nico que en algn momento ha sufrido con esto). El texto explica:
Before starting JMC, you need to add the -Xbootclasspath/a option to the -vmargs section of the jmc.ini file. The value for this option (after a colon) should be set to the extended classpath that is generated by JBoss's jconsole.bat file (for this, add @echo on to the file and run it).
Antes de iniciar JMC, necesitas agregar la opcin -Xbootclasspath/a a la seccin -vmargs del archivo jmc.ini. El valor de esta opcin (luego de dos puntos) deber configurarse para incluir el uso de las libreras que genera el archivo jconsole.bat de JBoss (para esto, agrega @echo on en el archivo y ejectalo).
Ejecutar jconsole.bat. Se abrir una consola y luego la ventana de JConsole. Lo importante aqu es el contenido impreso en la consola. En la parte final de los mensajes, vers un mensaje con un contenido similar a este:
Lo principal es obtener el valor de la variable -J-Djava.class.path para la condicin que se cumpla de acuerdo al mensaje de log. En este caso, como la condicin es: "" == "", tomar el resultado de la primera parte: 152ee80cbc
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