Java and Web service interview questions: - What are the different approaches in making Web service?

An interesting Java interview question asked in most of the interviews while
discussing topic on web services. There are basically two approaches in making
web service: -

1) WSDL first Implemention second: In this case the Web service definition
language XML is made first and using the same the web service bean classes are
generated which implement the necessary functionality

Since WSDL defines Contract this is also known as Contract first


2)Implementation first WSDL second: This approach is used whenever legacy code
is available which needs to be exposed as service. So here implementation is
already available and hence only contract needs to be created using WSDL.

Following is the introductory video on Webservice for the one's who are new to
this topic: -






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