In order to start tracking classes, you have to click on the
record toolbar button
or choose View->Record class tracker data from JProfiler's
main menu.
Before class tracking is started, the class tracker options dialog is shown. The selected classes and packages are shown in a combo box, the object type (all objects or recorded objects) and liveness mode (for recorded objects only) selections are shown at the top of the class tracker view.
After class tracking is started, the record button becomes a stop button
that allows to to end recording for all feeds.
Stopping class tracking and re-starting it again at a later point does not delete previously recorded data unless the object type or liveness mode (for recorded objects) are changed.