Boot In Action //free\\ — Spring

Using @OneToMany with FetchType.LAZY but then calling product.getOrders() inside a REST controller triggers 101 SQL queries. Fix: Use @EntityGraph or write a custom @Query("SELECT p FROM Product p JOIN FETCH p.orders ") . Spring Boot’s Data JPA logs queries with logging.level.org.hibernate.SQL=DEBUG .

@Entity @Data @NoArgsConstructor public class Book @Id @GeneratedValue private Long id; private String title; private String author; Spring Boot In Action

To understand Spring Boot, one must understand the problem it solves. In traditional Spring development, developers were responsible for explicitly defining every bean, data source, and configuration. This approach offered ultimate flexibility but resulted in "configuration hell." Using @OneToMany with FetchType

That is Spring Boot in action. Go build something great. Go build something great

Writing code is easy. Keeping it alive under load is where Spring Boot proves its worth.

Spring Boot flips this model on its head using the principle of .

java -Xmx512m -Xms256m -XX:+UseG1GC -jar myapp.jar