Prerrequisites

Java is required on the system running the plugin

1. Enabling Remote JMX Monitoring for Java Applications
A Java application does not require additional software installed, but it must be started with the following command line options to enable support for remote JMX monitoring.

At the very least, if you only want to start monitoring a basic Java application on a local host without security, use these options:

-Dcom.sun.management.jmxremote \
-Dcom.sun.management.jmxremote.authenticate=false \
-Dcom.sun.management.jmxremote.ssl=false \
-Dcom.sun.management.jmxremote.port=9090 \
-Dcom.sun.management.jmxremote.rmi.port=9090 \
-Djava.rmi.server.hostname=localhost"

This configures Java to accept incoming JMX connections on port 9090 from localhost only, without requiring authentication or SSL.

If authentication is required, it must be enabled:

-Dcom.sun.management.jmxremote \
-Dcom.sun.management.jmxremote.authenticate=true \
-Dcom.sun.management.jmxremote.ssl=false \
-Dcom.sun.management.jmxremote.port=9090 \
-Dcom.sun.management.jmxremote.rmi.port=9090 \
-Djava.rmi.server.hostname=localhost \
-Dcom.sun.management.jmxremote.password.file=/usr/local/tomcat/conf/jmxremote.password \
-Dcom.sun.management.jmxremote.access.file=/usr/local/tomcat/conf/jmxremote.access

2. The system running the plugin must have connectivity and be able to reach the JMX server.