Update Spring Boot and Mysql version for react-java-mysql sample

Signed-off-by: Guillaume Lours <guillaume.lours@docker.com>

react-java-mysql/backend/src/main/java/com/company/project/controllers/HomeController.java

@@ -1,16 +1,21 @@
 package com.company.project.controllers;
 
-import org.springframework.stereotype.Controller;
+import com.company.project.entity.Greeting;
+import com.company.project.repository.GreetingRepository;
+import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.ui.Model;
 import org.springframework.web.bind.annotation.GetMapping;
-import org.springframework.web.bind.annotation.RequestParam;
+import org.springframework.web.bind.annotation.RestController;
 
-@Controller
+@RestController
 public class HomeController {
 
+    @Autowired
+    private GreetingRepository repository;
+
     @GetMapping("/")
-    public String showHome(String name, Model model) {
-        return "home";
+    public Greeting showHome(String name, Model model) {
+        return repository.findById(1).orElse(new Greeting("Not Found 😕"));
     }
 
 }

react-java-mysql/backend/src/main/java/com/company/project/entity/Greeting.java

@@ -0,0 +1,61 @@
+package com.company.project.entity;
+
+import javax.persistence.Entity;
+import javax.persistence.Id;
+import javax.persistence.Table;
+import javax.persistence.Column;
+import javax.persistence.GeneratedValue;
+
+@Entity
+@Table(name = "greetings")
+public class Greeting {
+
+    @Id
+    @GeneratedValue
+    private int id;
+    @Column(nullable = false)
+    private String name;
+
+    public Greeting() {
+    }
+
+    public Greeting(String name) {
+        this.name = name;
+    }
+
+    public Greeting(int id, String name) {
+        this.id = id;
+        this.name = name;
+    }
+
+    public int getId() {
+        return id;
+    }
+
+    public void setId(int id) {
+        this.id = id;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+
+        Greeting greeting = (Greeting) o;
+
+        return name.equals(greeting.name);
+    }
+
+    @Override
+    public int hashCode() {
+        return name.hashCode();
+    }
+}

react-java-mysql/backend/src/main/java/com/company/project/repository/GreetingRepository.java

@@ -0,0 +1,9 @@
+package com.company.project.repository;
+
+import com.company.project.entity.Greeting;
+import org.springframework.data.repository.CrudRepository;
+import org.springframework.stereotype.Repository;
+
+@Repository
+public interface GreetingRepository extends CrudRepository<Greeting, Integer> {
+}