To call a web service from a java project you need to obtain a web-service client for that service (or generate one from WSDL).
First of all I would suggest that you make sure that the WebService is deployed and functional. To check this you can use SoapUi project.
Secondly try to either generate the web-service client (this step varies depending on how you developed the web-service)
Finally you import the web-service client into your java project and follow one of the many tutorials on how to connect web-service clients to the web-service. (tutorial)