Sample JAX-RS REST API Implementation

 We can use different  tools and technologies to create and expose a REST API. In this blog I will explain how to create a simple JAX-RS REST API using JDeveloper. 

• Open Jdeveloper and create a new ADF REST Web Application
• Provide an application name - JaxRsSampleApp
• Provide a package name - xxvk.svn
• Select Next and Keep the default Project Name 
• Select Finish
• This will generate two projects. 
• RESTModel
• RESTWebservice
• Delete the RESTModel project
• Right click the RESTWebservice project and select new
• Select Java Class and provide a name. - HelloService
• Add following  @Path("/services") before the class definition // Note : Path can be anything
• Select the warning/error next to Path and select add JaxRs package to the project. 
• As soon as you add the JAX RS package to the project it will generate the main application Java class - GenericApplication with an extend jax.rs.core.Application
• Delete the default method and add the following sample method to return sample plain text. 
• Right click the project and select project properties
• Got to Java EE Application
• Context Root to a meaning full value. -- HelloService
• Save changes 
• Right click the Java service and select RUN. 
• This will deploy the application to Integrated server and provide the sample URL
• http://127.0.0.1:7101/xxvk-service/resources/services
• Take the URL and paste in a browser. It will display the result. 

    package xxvk.svn;

    import javax.ws.rs.GET;

    import javax.ws.rs.Path;

    import javax.ws.rs.Produces;

    import javax.ws.rs.core.MediaType;

@Path("/services")

public class HelloService {

        @GET  // This will import the Get package

        @Produces(MediaType.TEXT_PLAIN)  // This will produce the out put in plain text format
        public String Sayhello(){
            return "Hello Welcome";
        }

}