Debugging High CPU usage on J2EE app - JTOP

To debug high CPU usage on Java app, run JTOP with:

java -jar %JDK_HOME%\demo\management\JTop\JTop.jar <hostaddr>:<port>

The JVM must be started with the following options set:

JAVA_OPTS="$JAVA_OPTS -Dcom.sun.management.jmxremote.port=11099"
JAVA_OPTS="$JAVA_OPTS -Dcom.sun.management.jmxremote.authenticate=false"
JAVA_OPTS="$JAVA_OPTS -Dcom.sun.management.jmxremote.ssl=false"

Find the outlier threads

Do one of the following to get the Java PID:

ps -ef | grep java
OR
jps
OR
jconsole

Execute one of the following to get a thread stack dump:
kill -3 <pid>
OR
jstack <pid> > %lt;someFile>
OR
jconsole - connect to VM, click on Threads tab, select thread
OR
jvisualvm - connect to VM, click thread dump button

Analyze the thread stack to see where the code is executing causing high CPU