This is the simple diagnostic tool which collects some stats, defined in configuration file, stores them into DB and show them on a web page. Also it may send a mail message if something is wrong.
Each stat may have normal and error states. This tool detects all changes and may notify you in UI or by e-mail what is wrong. Then in UI (or directly in DB) you may see the whole history of all stats and that may help you to diagnose a problem.
For example you may want to define stats like:
- amount of java processes running - from 1 to 5 is normal, other values are error
- amount of disk space remaining - 100GB is normal, less is bad
- delay in opening the homepage - 100ms is good, longer is bad
- etc.
ant
Then find the build in build folder
- install MySQL
- execute
stats.sqlin it - run monitor.jar - it will run diagnostic tool itself
- deploy monitor.war to Tomcat - it will run UI
UI and diagnostic tool are independent - then may work separately or on different workstations, they just need to share the DB
See monitor.xml for reference. Note that you may change it in runtime - diagnostic tool will reload configuration on change.
For web UI the simple self-made framework is used on top of JSP. I think usage of Struts could be overkill here.