Note sure I understood your question, but as per objective 4.5 (quoted below), you have to know which are the avantages/disavantages of the Java-WSDL, resp. WSDL-Java mappings. Under which circumstances would you prefer one approach over the other?
4.5 Explain the advantages and disadvantages of a WSDL to Java vs. a Java to WSDL development approach.