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Core Concepts

  1. Introduction to Spring Data JPA
  2. Spring Data JPA vs Hibernate vs JDBC
  3. Setting up Spring Boot with Spring Data JPA
  4. Configuring DataSource, EntityManager, and Transactions
  5. Spring Data JPA Annotations (e.g., @Entity, @Table, @Id, @GeneratedValue)

Repositories in Spring Data JPA

  1. CrudRepository, PagingAndSortingRepository, and JpaRepository
  2. Custom Query Methods in Repository (Derived Query Methods)
  3. JPQL (Java Persistence Query Language) Queries
  4. Native SQL Queries using @Query Annotation
  5. Named Queries (@NamedQuery and @NamedNativeQuery)
  6. Specification API (Dynamic Queries using Criteria API)
  7. Projections (DTO-Based Query Results)

Entity Relationships & Mapping

  1. One-to-One Mapping
  2. One-to-Many & Many-to-One Mapping
  3. Many-to-Many Mapping
  4. Cascade Types in JPA
  5. Fetch Types (EAGER vs LAZY Loading)
  6. Join Fetch & Entity Graphs for Performance Optimization

Transactions and Performance Tuning

  1. Understanding Spring Transactions with @Transactional
  2. Optimistic vs Pessimistic Locking (@Version & LockModeType)
  3. N+1 Query Problem and Solutions (JOIN FETCH, Batch Fetching)
  4. Caching in JPA (First-Level & Second-Level Caching with EhCache, Hazelcast, Redis)
  5. Batch Processing and Bulk Inserts/Updates

Advanced JPA Topics

  1. Soft Deletes using @SQLDelete and @Where
  2. Auditing with @CreatedDate, @LastModifiedDate, and Envers
  3. Multi-Tenancy Implementation with Spring Data JPA
  4. Stored Procedures and Function Calls in JPA
  5. Entity Inheritance Strategies (SINGLE_TABLE, JOINED, TABLE_PER_CLASS)
  6. Using Specification API with Criteria Queries

Testing & Debugging

  1. Testing Spring Data JPA Repositories with H2 Database
  2. Using Testcontainers for Database Integration Testing
  3. Logging SQL Queries for Debugging (spring.jpa.show-sql=true, Hibernate Interceptor)

Integration with Other Technologies

  1. Spring Data JPA with Spring Boot & REST APIs
  2. GraphQL with Spring Data JPA
  3. Spring Data JPA with Kafka, RabbitMQ for Event-Driven Applications
  4. Spring Data JPA with Elasticsearch, MongoDB, and Redis
  5. Spring Data JPA with Microservices (Saga Pattern, Outbox Pattern)

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