Friday, July 15, 2011

JMX configurable Support from WSO2 Carbon

When a user start-up any WSO2 product and while having a look on the log displays while server starting he/she could see a URL called JMX Service URL as in [1] displays on the log.This is the URL use to connect with JConsole to monitor memory consumption,thread utility,manage MBeans and more.

As above each of the products from WSO2 family,provides in-built support from Carbon platform to manage and monitor of its resources such as applications,services,JVM using JMX [Java Management Extensions] support.

You can see each JMX service url contains host names and port values.In early Carbon released versions [before 3.2.0 release],these values couldn't be change according to user's preference.Those values directly taken from system properties own by running Carbon server.But there are some use-cases where users need to create JMX URLs according to their preference.For example when apache proxy server configured infront of ESB and user need to connect to JConsole by using apache proxy host name and port values.

Hence from Carbon release 3.2.0 onwards,we have introduce a new config file called jmx.xml [in carbon_home/repository/conf/advanced/jmx.xml] and from that file a user can set the property values for JMX URL as below.

To enable configuring property values from this jmx.xml file,first the property value 'StartRMIServer' should be set to 'true'.

Note that the two JMX port values are included in carbon.xml [in carbon_home/repository/conf/carbon.xml] file too.And the same port values included in jmx.xml file are overridden by the values included in carbon.xml file.
Once user configured JMX RMI property values as he/she required he/she can re-start the server and watch the log displays while server starting.We say these property values as RMI values because we use these property values to transmit client requests[carbon server request] to remote JMX MBean Server [JConsole] .Finally copy the custom JMX Service URL displayed in server log and paste into JConsole connections section called 'Remote Process' as below.

Then you'll able to connect with server you want and monitor resources consumption of it.

[1] service:jmx:rmi://localhost:11111/jndi/rmi://localhost:9999/jmxrmi

For further information,refer following links.

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