# LightFish--An OpenSource GlassFish Monitoring Tool And Screencast

LighFish is an opensource Java EE 6 application without any external dependencies which gathers and persists periodically GlassFish's monitoring data. LightFish is deployed on a Java EE 6 application server and usually remotely accesses a "GlassFish Under Stress" instance.
The probes (snapshots) are gathered via REST, persisted into a relational DB for post-mortem analysis and pushed to Java FX 2 UI in real time via HTTP.

Features / Monitoring:

Threads And Memory:
Heap Size, Thread Count, Peak Thread Count
Transactions:
Commits and Rollbacks
"Paranormal Activity" :-)
Queued Connections, Errors and Busy Thread Count
HTTP Sessions
Active and Expired Sessions
JDBC Pools
Free and used connections, potential connection leaks, and the Length of the wait queue



Watch a walk-through LightFish screencast:





Enjoy monitoring!