When I was profiling the Digester code I was suprised that the
beanutils.MethodUtils didn't cache the looked up methods.
But in the case of the Digester Rules, I'd rather keep just the Method reference
than the name of the method around for later lookup, because doing a method
lookup is more than just looking up a method by name, it also requires you to
build up a Class to specifiy the parameters for the method.
As often as the Digester does method invokation I think it makes sense to cache
the Method reference in the specific Digester Rule instance, because to some of
us every bit of speed helps.
That being said, I do think it would be a good idea for the lang package to
cache things that are looked up.