How to Count Active Sessions in Tomcat 7.

Products

• CA Application Performance Management Agent (APM / Wily / Introscope)
• INTROSCOPE

Issue/Introduction

 How to count Active Sessions from Tomcat 7.

Environment

All supported releases with a Java Agent running Tomcat 7.

Resolution

Add the following instrumentation under the Tomcat pbd. 

-TraceOneMethodOfClass: org.apache.catalina.session.StandardSession expire
(Z) V SimpleDecrementor "Tomcat: Number of sessions"
TraceOneMethodOfClass: org.apache.catalina.session.StandardSession
SimpleIncrementor "Tomcat: Number of sessions"

Restart the application server.