Java Jpa Hibernate

Java JPA Hibernate Skill

Master data persistence with JPA and Hibernate for production applications.

Overview

This skill covers JPA entity design, Hibernate optimization, Spring Data repositories, query strategies, and caching. Focuses on preventing N+1 queries and building high-performance persistence layers.

When to Use This Skill

Use when you need to:

• Design JPA entities with relationships
• Optimize database queries
• Configure Hibernate for performance
• Implement caching strategies
• Debug persistence issues

Topics Covered

Entity Design

• Entity mapping annotations
• Relationship types (1:1, 1:N, N:M)
• Inheritance strategies
• Lifecycle callbacks
• Auditing

Query Optimization

• N+1 problem prevention
• JOIN FETCH vs EntityGraph
• Batch fetching
• Projections and DTOs

Transactions

• @Transactional configuration
• Propagation and isolation
• Optimistic vs pessimistic locking
• Deadlock prevention

Caching

• First and second level cache
• Query cache
• Cache invalidation
• Redis integration

Quick Reference

// Entity with relationships
@Entity
@Table(name = "orders")
public class Order {