2 Minutes To Code (β Version)

Eclipse Memory Analyzer - 2 minute tutorial

Dominator Tree Tab : All classes with their fields/references

The Dominator Tree lists the biggest objects in the jvm dump. You can expand each item to see other objects referenced by it.

This way you can nail down the biggest memory hog and also the class/object that holds a reference to it there by preventing it from being garbage collected. That class is your culprit.