Why does JDK dynamic Proxy only work with Interfaces?

The JDK Proxy class only accepts interfaces in the factory method newProxyInstance(). Is there a workaround available, or alternative implementations? The use cases are limited if I have to extract methods to an interface in order to enable them for use with a proxy. I would like to wrap them to apply annotation based actions during runtime. public static T getProxy(T obj) { InvocationHandler ih = new InjectProxy( obj ); ClassLoader classLoader = InjectProxy.class.getClassLoader(); return (T) Proxy.newProxyInstance( classLoader, obj.getClass().getInterfaces(), ih ); ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ }
Well, in principle you can use a bytecode library like ASM to create a class-based proxy yourself.

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