DualLoader

A ClassLoader with two parents parentA and parentB. The predicates direct lookups towards one parent or the other.

If aOnlyClasses returns true for a class name, class lookup delegates to parentA only. Otherwise, if bOnlyClasses returns true for a class name, class lookup delegates to parentB only. If both aOnlyClasses and bOnlyClasses are false for a given class name, both class loaders must load the same Class or a DifferentLoaders exception is thrown.

If aOnlyResources is true for a resource path, lookup delegates to parentA only. Otherwise, if bOnlyResources is true for a resource path, lookup delegates to parentB only. If neither are true for a resource path and either parentA or parentB return a valid URL, that valid URL is returned.