Adding a Handler to a Web Service Descriptor
To add a handler to a web service descriptor
1. In Package Navigator view, open and lock the web service descriptor to which you want to add handlers.
2. In the Handlers tab, click 
on the web service descriptor toolbar. Or right-click and select Add Handler. 3. Select the registered handler that you want to add to the web service descriptor.
4. Click File > Save.
5. Once a handler is added to a web service descriptor, you may optionally add any headers associated with the handler to the request or response elements of operations within the web service descriptor.
Note:
You must set up a package dependency if the web service descriptor uses a handler from a different package.