how to load different versions of the same class?

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I have read a lot about Java classloaders, but so far I have failed to find an answer for this simple question:

I have two versions of com.abc.Hello.class in jars v1.jar and v2.jar. I want to use both in my application. What is the simplest way of doing this ?

I don't expect to be that simple, but something along these lines would be awesome :

Classloader myClassLoader = [magic that includes v1.jar and ignores v2.jar]
Hello hello = myclassLoader.load[com.abc.Hello]

And in a different class :

Classloader myClassLoader = [magic that includes v2.jar and ignores v1.jar]
Hello hello = myclassLoader.load[com.abc.Hello]

I would like to avoid using OSGi.