J2EE Application Server counters

Common J2EE application servers include WebLogic, websphere, and tomcat. The following is a counter given by Weblogic as an example.

Category	Counter name	Counter description
JVM	Heap size	JVM heap size. The value of this counter is a real-time value.
	Heap free	JVM available heap size. The value of this counter is a real-time value.
JDBC connection pool	Waiting for connection Current count	Number of pending connections. If the counter value continues to be large, you may need to increase the JDBC connection pool of the application server.
	Connections total count	Total JDBC connections
	Max capacity	Total capacity of the JDBC connection pool. You can compare the counter with the previous two counter values to obtain the conclusion that the connection pool settings are reasonable.
	Active connections current count	The number of currently active JDBC connections. The counter value can be used to check whether the utilization of JDBC connections is reasonable.
Execute queue	Execute thread current idle count	Number of Idle threads
	Pending request oldest time	The longest time of a queue request. Through this counter, you can see whether the queue is obviously congested.
	Serviced request total count	Total number of processed requests. The counter value can be used to compare with the number of clicks obtained by the performance testing tool.
	Pending request current count	Number of pending requests

J2EE Application Server counters