At 2004， Oracle released application server - Oracle® Application Server Containers for J2EE 10g, with the kernel OC4J，That versions were OC4J 9.0.3, OC4J 9.0.4 with JDK 1.3 or JDK 1.4。
Some customers deployed the solutions for their critical business application. Now the application should be monitored.
Dell Foglight does not provide solutions out of box. Now InnovateDigital developed the cartridge based on the Foglight.
The metrics collected：
JVM: Active Thread Groups, Active Threads,Free Memory,Total Memory,UpTime;Servlet :is Active, Average Execution Time, Completed Count, Max Execution Time, Min Execution Time, Total Time, Current Average Execution Time;
JDBC Connection: Create Time, Close Count, Create Count, Open Count;
Because in that decade, JDK and OC4J did not provide the standard interface just like jmx. So parse the specific data stream was the only way to fetch runtime information from OC4J.
more details http://www.innovatedigital.com/node/957
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