H2 Schema Empty in Spring Boot Application - spring

Question

I'm setting up a barebones Spring Boot project described here and I'm running into issues with the basic setup.
It seems that the DatabaseLoader does not get invoked, and when I open the H2 Console for this project I see no schema containing an Employee table.
Here's the relevant part of my pom.xml:
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-rest</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-thymeleaf</artifactId>
</dependency>
<dependency>
<groupId>com.h2database</groupId>
<artifactId>h2</artifactId>
<!--
<scope>runtime</scope>
-->
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>1.16.4</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<optional>true</optional>
</dependency>
</dependencies>
my domain:
#Data
#Entity
public class Employee {
private #Id #GeneratedValue Long id;
private String firstName;
private String lastName;
private String description;
public Employee() {}
public Employee(String firstName, String lastName, String description) {
this.firstName = firstName;
this.lastName = lastName;
this.description = description;
}
}
And the database loader:
public class DatabaseLoader implements CommandLineRunner {
private final EmployeeRepository repository;
#Autowired
public DatabaseLoader(EmployeeRepository repository) {
this.repository = repository;
}
#Override
public void run(String... strings) throws Exception {
this.repository.save(new Employee("duke", "earl", "dude"));
}
}
Navigating to the console after application startup at localhost:8080/console shows jdbc:h2:~/test with only an INFORMATION_SCHEMA and users menu. I also set this up as a CRUD repository and, though I can post to it, none of the attribute data seems to be saved, but the Employees resource is recognized.
POST:{"firstName": "Bilbo", "lastName": "Baggxins", "description": "burglar"}
Comes back with:
{
"_links": {
"self": {
"href": "http://localhost:8080/api/employees/4"
},
"employee": {
"href": "http://localhost:8080/api/employees/4"
}
}
}

Answer 1

The default h2 url with Spring Boot is: jdbc:h2:mem:testdb
To use jdbc:h2:~/test you must add this to your application.properties:
spring.h2.console.enabled=true
spring.datasource.url=jdbc:h2:~/test
What's happening is, you are writing the Employee in spring-boot's memory database (testdb). Then, you open the h2-console to jdbc:h2:~/test, which creates it on the fly, and let you browse emptiness.
With spring.h2.console.enabled=true you may open a browser to http://localhost:8080/h2-console and view the database content. Use the following settings:
Saved Settings: Generic H2 (Embedded)
Driver Class: org.h2.Driver
URL: jdbc:h2:mem:testdb
username: sa
password:

Answer 2

This is shamelessly borrowed from Josh Long. This is a working CommandLineRunner implementation. Github full code
#Component
class SampleRecordsCLR implements CommandLineRunner {
private final ReservationRepository reservationRepository;
#Autowired
public SampleRecordsCLR(ReservationRepository reservationRepository) {
this.reservationRepository = reservationRepository;
}
#Override
public void run(String... args) throws Exception {
Stream.of("Josh", "Jungryeol", "Nosung", "Hyobeom",
"Soeun", "Seunghue", "Peter", "Jooyong")
.forEach(name -> reservationRepository.save(new Reservation(name)));
reservationRepository.findAll().forEach(System.out::println);
}
}