We put lately more attention to monitoring and tuning our systems – mainly db. I tried to refresh in mind how to check active sessions on jvm for specified app. I’ve experimented with VisualVM, but it didn’t satisfied me. I simply does not work out-of-the-box. After registering jmx remote host, I could not expand apps list…
I need something more standard and working then that. I’ve run “jconsole” (attached to each jdk copy).
Then I’ve connected to: myFavouriteAppsserver.com:8686
and under the path: com.sun.appserv/Manager/myAwesomeAppName/server/Attributes
I’ve found to variables: activeSessions and sessionCount. Take a look