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FlxBox2D is a wrapper for Box2D through libgdx. The Box2D is a full JNI wrapper which means there's no garabage collection issues at all and the JNI call overhead is minimal.

A 2D Physics Engine for Games.

JBox2D is a close Java port of Erin Catto's excellent C++ Box2D physics engine and Google's LiquidFun physics Engine.

Real-time physics simulation.

Chipmunk2D is the official physics engine of Cocos2d, featuring full.