Iterate over all objects which are not garbage collected

Our website has memory issues. A typical situation is the event
handler has reference to a window/widget.

Instead of checking those situations case by case, I wonder if java
can iterate/enumerate all objects that is not garbage collected. ( I
care more in java mode than javascript mode now )

By looking at the number of instances per class, I can quickly tell
the problem.

Can we?
-Tom

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