I'm trying to write a JAXB2 XJC plugin which adds Compass annotations to JAXB-generated classes, and I need to be able to determine if a given Compass configuration has a type converter for a given class. Because XJC plugins operate off a code metamodel, I don't have instances of Class objects to pass to ConverterLookup.lookupConverter(), I only have the class name. If ConverterLookup had a lookupConverterByClassName(), this would asolve my problem nicely. As it is, I have to use reflection to get hold of the maps inside DefaultConverterLookup, and introspect that. If you don't want to add the method to the ConverterLookup interface itself, then even just adding it to DefaultConverterLookup as a public method would probably suffice.