Spring Boot : Spring Data JPA

Example of how to configure Spring Data JPA

• pom.xml

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-web</artifactId>
</dependency>
    <dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
    <groupId>org.postgresql</groupId>
    <artifactId>postgresql</artifactId>
    <version>42.2.12</version>
</dependency>
<dependency>
    <groupId>org.projectlombok</groupId>
    <artifactId>lombok</artifactId>
    <version>1.18.12</version>
    <scope>provided</scope>
</dependency>

• application.properties

spring.datasource.url=jdbc:postgresql://localhost/{DBNAME}
spring.datasource.username={USERNAME}
spring.datasource.password={PASSWORD}
spring.datasource.driver-class-name=org.postgresql.Driver

• Customer.java

@Data
@Entity
public class Customer {

    @Id
    @GeneratedValue(strategy= GenerationType.IDENTITY)
    private Long id;

    private String name;
}

• CustomerRepository.java

public interface CustomerRepository extends CrudRepository<Customer, Long> {

    Optional<Customer> findById(Long id);
}