The interface created from the "Generate Java Interface from WSDL file." function always has lower case method names even it the WSDL oprtation names are upper case.
There are WSDL files out there that use Uppercase operation names and thus the function name - as ugly as it may be - needs to be uppercase as well or the SwitchYard validation will fail with message "Unbound Operation: Cannot resolve operation "helloWorld" on target.