Let's start with creating a simple REST service returning a welcome message. We will create a simple POJO WelcomeBean class with a member field called message and one argument constructor, as shown in the following code snippet:

    package com.mastering.spring.springboot.bean;

    public class WelcomeBean {
      private String message;

       public WelcomeBean(String message) {
         super();
         this.message = message;
       }

      public String getMessage() {
        return message;
      }
    }