jolokia-extra's purpose is to provide a potpourri of extensions to the Jolokia JMX-HTTP Bridge which are either to special or to big to include in the regular distribution.
Initially provided as a pull request to Jolokia by Marcin Płonka, a set of simplifier is available for better access to JSR-77 defined statistic values. Although JSR-77 has been abandoned for JEE 6 and later it is somewhat continues to live in various JEE containers, especially Websphere continues to support the JSR-77 naming and statistics scheme.
Using the profile jsr77 will build the agents with JSR-77 support. This means they simplifiers get included then
into the JVM and WAR agent. For OSGi you can directly deploy the jolokia-extra-addon-jsr77.jar to the OSGi container.
To build the agents call maven as usual:
mvn -Pjsr77 clean install
The agents can be found below agents/
Health checks can be used to provide internal, possibly complex checks on MBeans and return a consolidated view of the results via extra MBeans registered.
To create the specific agent, use the profile health
mvn -Phealth clean install
Agents can be found in agents/
Currently a Proof-of-Concept is available which registers an MBean jolokia:type=plugin,name=health with two operations:
cpuLoadCheck (which takes a CPU load threshhold) and mbeanCountCheck which simply checks whether there are any MBeans
registered. Refer to the source in addon/health for details.
You can expect a much more sophisticated version with a flexible configuration here soon.