Features of Hibernate

This list includes only modern Hibernate elements while omitting deprecated or outdated features and adding modern ones that were previously omitted.
Modern Hibernate Features Core Features

• Constraint Transparency
• Automatic Dirty Checking
• Detached Object Support
• Powerful Object-Oriented Query Language (HQL)
• Full Support for Polymorphic Queries
• Criteria API Queries (modern JPA Criteria API)
• Native SQL Queries
• JPQL (Java Persistence Query Language)

• Object/Relational Mappings
  • Flexible Object/Relational Mapping Strategies:
    • Single Table per Class Hierarchy
    • Table per Subclass
    • Table per Concrete Class
  • Polymorphic Associations
  • Bidirectional Associations
  • Association Filtering
  • Collections of Basic Types
  • Indexed Collections
  • Composite Collection Elements
  • Support for Immutable Entities
  • Support for Entity Graphs

Primary Key Generation

• Automatic Primary Key Generation
• Multiple Key Generation Strategies:
  • GenerationType.AUTO
  • GenerationType.IDENTITY
  • GenerationType.SEQUENCE
  • GenerationType.TABLE
• Application-Assigned Identifiers
• Support for Composite Keys

Object/Relational Mapping Definition

• Annotations-Based Mappings (preferred over XML mappings)
• XML Mapping Documents (still supported but less commonly used)
• Schema Generation with Hibernate Tools
• Support for Programmatic Configuration

Caching Architecture

• Thread Safeness
• Non-Blocking Data Access
• Session-Level Cache
• Second-Level Cache Integration:
  • Integration with caching providers like Ehcache, Infinispan, or Redis
• Query Cache for Frequently Used Queries

High-Performance Features

• Lazy Initialization
• Outer Join Fetching
• Batch Fetching
• Support for Optimistic Locking with Versioning/Timestamping
• Highly Scalable Architecture
• No Requirement for Special Database Tables
• Enhanced Fetching Strategies
• SQL Optimization for Specific Dialects
• Integration with Connection Pooling Tools (e.g., HikariCP)

Modern Java Integration

• Full Java Persistence API (JPA) 2.2+ Support
• Integration with Dependency Injection Frameworks (e.g., Spring, CDI)
• Support for Streams and Java 8+ Features
  • Functional programming with Stream APIs
  • Date/Time APIs (java.time)
• Immutable Entities and Embeddables
• Support for JSON/BLOB Handling
• Integration with JTA for Distributed Transactions

Advanced Features

• Event Listeners for Lifecycle Management
• Auditing with Envers
• Support for Multi-Tenancy
  • Schema-based Multi-Tenancy
  • Discriminator-based Multi-Tenancy
• Database Vendor-Specific Features
  • Native SQL Customizations
  • Dialect-Specific Enhancements
• Support for Soft Deletes with Filters

J2EE and Modern Framework Integration

• Full Support for Java EE and Jakarta EE
• JMX Support for Monitoring
• Integration with JCA (Java Connector Architecture)
• Smooth Integration with Java Application Servers (e.g., WildFly, Payara)

This updated list ensures the inclusion of modern Hibernate features while adhering to current standards and best practices.