easymock扩展包里的something

请问easymock扩展包里面用到的
net.sf.cglib.core.CollectionUtils;
net.sf.cglib.core.VisibilityPredicate;
net.sf.cglib.proxy.Callback;
net.sf.cglib.proxy.Enhancer;
net.sf.cglib.proxy.Factory;
net.sf.cglib.proxy.MethodInterceptor;
net.sf.cglib.proxy.MethodProxy;

org.objenesis.ObjenesisException;
org.objenesis.ObjenesisHelper;

都是什么包？从哪里能下载？