@RestController, @RequestMapping("/courses")

package com.in28minutes.springboot.learnspringboot;

public class Course {
	private long id;
	private String name;
	private String author;
	
	//Constructor
	public Course(long id, String name, String author) {
		super();
		this.id = id;
		this.name = name;
		this.author = author;
	}

	//getters
	public long getId() {
		return id;
	}

	public String getName() {
		return name;
	}


	public String getAuthor() {
		return author;
	}
	
	//toString
	@Override
	public String toString() {
		return "Course [id=" + id + ", name=" + name + ", author=" + author + "]";
	}	
}​

package com.in28minutes.springboot.learnspringboot;

import java.util.Arrays;
import java.util.List; // Import List class
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class CourseController {
	
	@RequestMapping("/courses") // Correct the URL path to "/courses"
	public List<Course> retrieveAllCourses(){
		return Arrays.asList(
			new Course(1, "id", "in28minutes"),
			new Course(2, "name", "in28minutes"),
			new Course(3, "jh", "in28minutes"),
			new Course(4, "jh123123", "in28minutes")
		);
	}
}