DemoApplication.java

package com.example;

import java.util.ArrayList;
import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.CommandLineRunner;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class DemoApplication implements CommandLineRunner {

	// Use constructor injection.
	@Autowired
	private EmployeeRepository employeeRepository;

	public static void main(String[] args) {
		SpringApplication.run(DemoApplication.class, args);
	}

	// Initialization to add data to h2 db.
	@Override
	public void run(String... args) throws Exception {

		List<Employee> employees = getAllEmployees();
		employees.forEach(employee -> employeeRepository.save(employee));

	}

	private List<Employee> getAllEmployees() {

		List<Employee> employees = new ArrayList<>();
		employees.add(new Employee("Barney", "Stinson"));
		employees.add(new Employee("Alex", "Hitch"));
		employees.add(new Employee("Douglas", "Ramsey"));
		return employees;
	}

}