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/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();
+    }
+}