MyJConsole

The idea of MyJConsole is to collect the same data as the standard java jconsole program. The difference is that jconsole does not allow collected data to be stored, only displayed. MyJConsole does the opposite, it collects and store jvm data for an external program to use it. An example would some scripts that insert it into a RRD to create some nice graphs.

How it works

It's quite simple, you just run:

java -jar my-jconsole-x.y.z ./sample.conf ./sample_bean.conf

The configuration file is quite simple and you can build one from the template file sample.conf. There are four default mbeans monitored, other can be configured using the template file sample_bean. There are two examples:

• sample_bean_jdk6.conf
• sample_bean_jdk8.conf

The mbeans will be written to a file name ipaddr_port_YYYYMMDD and the columns are:

Fields:
0 - TimeStamp
1 - CPU Usage
2 - Heap Usage
3 - Loaded Class Count
4 - Thread Count
5 - User configured bean
  .
  .
N - User configured bean

Requirements

It uses java JDK 8. As far as I've tested it can monitor jdk's 6 to 8.

An example of jdk options to test with sample_bean_jdk6.conf

• -XX:ParallelGCThreads=5
• -XX:+UseConcMarkSweepGC
• -XX:+UseParNewGC
• -Dcom.sun.management.jmxremote.authenticate=false
• -Dcom.sun.management.jmxremote.ssl=false
• -Dcom.sun.management.jmxremote.port=7001

or just copy and paste:

-XX:ParallelGCThreads=5 -XX:+UseConcMarkSweepGC -XX:+UseParNewGC -Dcom.sun.management.jmxremote.authenticate=false -Dcom.sun.management.jmxremote.ssl=false -Dcom.sun.management.jmxremote.port=7001

An example of jdk options to test with sample_bean_jdk8.conf

• -XX:+UseG1GC
• -Dcom.sun.management.jmxremote.port=7001
• -Dcom.sun.management.jmxremote.authenticate=false
• -Dcom.sun.management.jmxremote.ssl=false

or just copy and paste:

-XX:+UseG1GC -Dcom.sun.management.jmxremote.port=7001 -Dcom.sun.management.jmxremote.authenticate=false -Dcom.sun.management.jmxremote.ssl=false