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Javamelody is an opensource (LGPL) application to monitor Java or Java EE application servers in QA and production environments.

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(Extract from the Javamelody home page)

• It allows to improve applications in QA and production

• Give facts about the average response times and number of executions

• Make decisions when trends are bad, before problems become too serious

• Optimize based on the more limiting response times

• Find the root causes of response times

• Verify the real improvement after optimization

It includes summary charts showing the evolution over time of the following indicators:

• Number of executions, mean execution times and percentage of errors of http requests, sql requests, jsp pages or methods of business façades (if EJB3, Spring or Guice)

• Java memory

• Java CPU

• Number of user sessions

• Number of jdbc connections

These charts can be viewed on the current day, week, month, year or custom period.
You can even execute garbage collection to free resources, or view / invalidate http sessions.

Setting up Javamelody on your server

*Step 1: *
Download the javamelody-1.36.0.zip zip file.
Now, unzip, and add copy the files javamelody.jar and jrobin-x.jar into the in the lib directory of Tomcat.

*Step 2: *
Add the following lines in the web.xml file of the conf directory of Tomcat (and not in the WEB-INF/web.xml files of the webapps).

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web.xml.snippet

        <filter>
                <filter-name>monitoring</filter-name>
                <filter-class>net.bull.javamelody.MonitoringFilter</filter-class>
        </filter>
        <filter-mapping>
                <filter-name>monitoring</filter-name>
                <url-pattern>/*</url-pattern>
        </filter-mapping>
        <listener>
                <listener-class>net.bull.javamelody.SessionListener</listener-class>
        </listener>

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The full instrcutions are available here.

What does the Javamelody monitoring page look like?

Attached below is a screenshot of my Javamelody monitoring page. Note that this screenshot is of a development environment with no data and just a single user.

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