application.yml

management:
  endpoints:
    web:
      exposure:
        include:
          - course
          - health
          - beans
  server:
    port: 3000 # run on a port that is not exposed on the firewall or security group
    address: 127.0.0.1 # restrict to requests from localhost

CreateCourseActuator.java

package com.example.demo.actuator;

import com.example.demo.model.Course;
import com.example.demo.repository.CoursesRepository;
import java.util.List;
import org.springframework.boot.actuate.endpoint.annotation.Endpoint;
import org.springframework.boot.actuate.endpoint.annotation.ReadOperation;
import org.springframework.boot.actuate.endpoint.annotation.WriteOperation;
import org.springframework.stereotype.Component;

@Endpoint(id = "course")
@Component
public class CreateCourseActuator {

  private CoursesRepository repository;

  public CreateCourseActuator(CoursesRepository repository) {
    this.repository = repository;
  }

  @ReadOperation
  public List<Course> readCourses() {
    return repository.findAll();
  }

  @WriteOperation
  public void createCourse(String name) {
    repository.create(new Course(name));
  }
}