using protytype proxies with ProxyFactoryBean

[tongueNcheek]

I'm trying to optimize my AOP code by caching all the ProxyFactoryBeans I create with key=class. I set isSingleton(false) on the ProxyFactoryBean and I get "Using non-singleton proxies with singleton targets is often undesirable" which is going to kill my logging. So I was trying to use setTargetName like it suggests but I also apparently have to define a BeanFactory. So is there a bean factory that I can use that will initialize from say a class name? I don't know what classes I might be proxying at runtime so I can't list and name them all in a bean config file. Not using the setTargetName works just fine for me except for the logging issue I mentioned. Any suggestions? Thanks.