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  Tutorial: Contract-First Web Services with Apache Axis2

When implementing Web services, there are two alternative development paths you can take: the code-first approach and the contract-first approach.

Tutorial Details:

Usually when developing Web services, developers like to code the business logic first and then expose that logic as a Web service. This is convenient because developers' core competency is the particular programming language they use. It also happens to be much more convenient for exposing existing programs as Web services. However, the code-first approach has several drawbacks.

*The developer has less control over the process of exposing code as services. A change to the code may mean a regeneration of the publicly visible Web services interfaces, and often it is difficult to agree on such a generated interface from a business perspective. The client programs often are generated using the service's WSDL file; if the service WSDL file is likely to change, then the point of having generated clients becomes less obvious.

*The code for the service process is likely to change between service frameworks and even framework versions, and it becomes difficult to maintain a single interface across versions.

It is true that by using annotations the impact of some of these issues can be lessened. Annotations help the developer take control of the process of exposing code. However, there is no such thing as a generic annotation scheme to make it universally applicable over multiple languages and multiple frameworks!


 

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Contract-First Web Services with Apache Axis2

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