Can you please post or describe your EAR deployment structure (and also structure of included files)? Which WF version do you use? Can you describe the class and its deployment where do you use this Service class? Which CDI module are you adding?
I was able to resolve by adding the wsdl4j-1.6.3.jar using maven within the project instead adding as a .jar. Not sure why this made a difference but I will leave it as a IDE mystery for now. Thanks for your assistance.