finished

complete/src/main/java/hello/Greeting.java

@@ -2,7 +2,7 @@ package hello;
 
 public class Greeting {
 
-    private final long id;
+    private final Long id;
     private final String content;
 
     public Greeting(long id, String content) {

complete/src/test/java/hello/GreetingControllerTests.java

@@ -33,6 +33,7 @@ import org.springframework.test.web.servlet.MockMvc;
 @AutoConfigureMockMvc
 public class GreetingControllerTests {
 
+
     @Autowired
     private MockMvc mockMvc;
 

pom.xml

@@ -0,0 +1,59 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <groupId>org.springframework</groupId>
+    <artifactId>gs-rest-service</artifactId>
+    <version>0.1.0</version>
+
+    <parent>
+        <groupId>org.springframework.boot</groupId>
+        <artifactId>spring-boot-starter-parent</artifactId>
+        <version>2.0.3.RELEASE</version>
+    </parent>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-web</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-test</artifactId>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>com.jayway.jsonpath</groupId>
+            <artifactId>json-path</artifactId>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
+
+    <properties>
+        <java.version>1.8</java.version>
+    </properties>
+
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.springframework.boot</groupId>
+                <artifactId>spring-boot-maven-plugin</artifactId>
+            </plugin>
+        </plugins>
+    </build>
+
+    <repositories>
+        <repository>
+            <id>spring-releases</id>
+            <url>https://repo.spring.io/libs-release</url>
+        </repository>
+    </repositories>
+    <pluginRepositories>
+        <pluginRepository>
+            <id>spring-releases</id>
+            <url>https://repo.spring.io/libs-release</url>
+        </pluginRepository>
+    </pluginRepositories>
+</project>

src/main/java/hello/Application.java

@@ -0,0 +1,12 @@
+package hello;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class Application {
+
+    public static void main(String[] args) {
+        SpringApplication.run(Application.class, args);
+    }
+}

src/main/java/hello/Greeting.java

@@ -0,0 +1,21 @@
+package hello;
+
+public class Greeting {
+
+    private final Long id;
+    private final String content;
+
+
+    public Long getId() {
+        return id;
+    }
+
+    public String getContent() {
+        return content;
+    }
+
+    public Greeting(Long id, String content) {
+        this.id = id;
+        this.content = content;
+    }
+}

src/main/java/hello/GreetingController.java

@@ -0,0 +1,20 @@
+package hello;
+
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RequestParam;
+import org.springframework.web.bind.annotation.RestController;
+import java.util.concurrent.atomic.AtomicLong;
+
+@RestController
+public class GreetingController {
+
+    private static final String template = "Hello, %s!";
+    private final AtomicLong counter = new AtomicLong();
+
+    @RequestMapping("/greeting")
+    public Greeting greeting(@RequestParam(value = "name", defaultValue = "World")String name){
+        return new Greeting(counter.incrementAndGet(), String.format(template, name));
+    }
+
+
+}