JPA and Hibernate

Learn how to model complex data relationships and class hierarchies in Hibernate. You’ll explore one-to-one, one-to-many, and many-to-many associations, understanding when to use unidirectional or bidirectional mapping. This module covers cascading operations, fetch strategies, and techniques for avoiding the common n+1 select problem. You’ll also map inheritance using single table, joined table, and table-per-class strategies, enabling efficient queries and streamlined database structures for enterprise-scale Java applications. 

Gain the skills to write effective, optimised queries using Hibernate Query Language (HQL) and Java Persistence Query Language (JPQL). You’ll create parameterised statements, work with joins, and apply ordering and grouping to extract exactly the data you need. Learn when to use eager fetching and how to combine native queries for advanced scenarios. This module ensures you can interact with databases cleanly, efficiently, and in a way that’s portable across different systems. 

Understand how to identify and address performance bottlenecks in Hibernate-based applications. You’ll examine fetch types, query-specific fetching, and how to use sets instead of lists for certain mappings to improve speed. Learn the benefits of first- and second-level caching, and when to let the database handle heavy operations. By applying these techniques, you’ll ensure your Java applications run efficiently, even with complex data models and high transaction volumes.