Chapter 5. Configuring the GreetingController to return a JSON response

Procedure

1. Expand your GreetingController class as shown in the example. The expanded class returns a JSON-formatted response that contains a greeting and a name. Note, that you must import the PathVariable annotation class from Spring Web to ensure that your configuration works correctly:

   src/main/java/org/acme/spring/web/GreetingController.java

   import org.springframework.web.bind.annotation.GetMapping;
   import org.springframework.web.bind.annotation.PathVariable;
   import org.springframework.web.bind.annotation.RequestMapping;
   import org.springframework.web.bind.annotation.RestController;
   
   @RestController
   @RequestMapping("/greeting")
   public class GreetingController {
   
       @GetMapping
       public String hello() {
           return "hello";
       }
   
       @GetMapping("/{name}")
       public Greeting hello(@PathVariable(name = "name") String name) {
           return new Greeting("hello " + name);
       }
   
       public static class Greeting {
           private final String message;
   
           public Greeting(String message) {
               this.message = message;
           }
   
           public String getMessage(){
               return message;
           }
       }
   }

1. When you make changes to your REST endpoint, you must also update the class file that contains the unit tests for your REST endpoint:

   src/test/java/org/acme/spring/web/GreetingControllerTest.java

   package org.acme.spring.web;
   
   import io.quarkus.test.junit.QuarkusTest;
   import org.junit.jupiter.api.Test;
   
   import static io.restassured.RestAssured.given;
   import static org.hamcrest.CoreMatchers.is;
   
   @QuarkusTest
   public class GreetingControllerTest {
   
       @Test
       public void testHelloEndpoint() {
           given()
             .when().get("/greeting/quarkus")
             .then()
               .statusCode(200)
               .body("message", is("hello quarkus"));
       }
   
   }

   Note, that when you use the Spring Web compatibility layer in Quarkus, the com.fasterxml:jackson.core dependency is automatically added to the classpath of your application and configured.