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Not much to add, lots of good suggestions already, but do you keep all your waves around forever? I clear the objects between rounds because all the pertinent data is in the kd-trees. I have more than a few trees in both gun and movement, too, for what it's worth. Do you have a big object as the "value" in your trees?

"static links only to movement & gun logs" and your R-tree are what jump out at me. I would try chopping off certain parts of your bot and seeing which brings your memory usage down to earth, though some kind of heap profiler (like MN suggested) would be more elegant. =)

Off-topic: Circular dependencies shouldn't matter, at least in modern JVMs. If the only references are within a circle unreachable from the root of code execution, it will be garbage collected.

No, all waves, bullets, targets etc. are dropped out at end of each round. But yes, "value" objects are pretty big, thanks, i will think about it. I do not understand you about my R-tree.

Well, I just meant that since you are the only one using it, it's relatively untested compared to, for instance, Rednaxela's kd-tree.

Voidious, you are genius!:) I detect indirect static link to AdvancedRobot instance, so nothing dropping out and quick fix are frees 100 mb memory. But beautiful solve of this problem are requires big refactoring, so fixed release will be after few days