Learn JPA & Hibernate Series
Last updated: October 19, 2023
Mocking is an essential part of unit testing, and the Mockito library makes it easy to write clean and intuitive unit tests for your Java code.
Get started with mocking and improve your application tests using our Mockito guide:
Handling concurrency in an application can be a tricky process with many potential pitfalls. A solid grasp of the fundamentals will go a long way to help minimize these issues.
Get started with understanding multi-threaded applications with our Java Concurrency guide:
Spring 5 added support for reactive programming with the Spring WebFlux module, which has been improved upon ever since. Get started with the Reactor project basics and reactive programming in Spring Boot:
Since its introduction in Java 8, the Stream API has become a staple of Java development. The basic operations like iterating, filtering, mapping sequences of elements are deceptively simple to use.
But these can also be overused and fall into some common pitfalls.
To get a better understanding on how Streams work and how to combine them with other language features, check out our guide to Java Streams:
Explore Spring Boot 3 and Spring 6 in-depth through building a full REST API with the framework:
Yes, Spring Security can be complex, from the more advanced functionality within the Core to the deep OAuth support in the framework.
I built the security material as two full courses - Core and OAuth, to get practical with these more complex scenarios. We explore when and how to use each feature and code through it on the backing project.
You can explore the course here:
Spring Data JPA is a great way to handle the complexity of JPA with the powerful simplicity of Spring Boot.
Get started with Spring Data JPA through the guided reference course:
Refactor Java code safely — and automatically — with OpenRewrite.
Refactoring big codebases by hand is slow, risky, and easy to put off. That’s where OpenRewrite comes in. The open-source framework for large-scale, automated code transformations helps teams modernize safely and consistently.
Each month, the creators and maintainers of OpenRewrite at Moderne run live, hands-on training sessions — one for newcomers and one for experienced users. You’ll see how recipes work, how to apply them across projects, and how to modernize code with confidence.
Join the next session, bring your questions, and learn how to automate the kind of work that usually eats your sprint time.
Object-Relational Mapping (ORM) is the process of converting Java objects to database tables. In other words, this allows us to interact with a relational database without any SQL. The Java Persistence API (JPA) is a specification that defines how to persist data in Java applications. The primary focus of JPA is the ORM layer.
Hibernate is one of the most popular Java ORM frameworks in use today. Its first release was almost twenty years ago, and still has excellent community support and regular releases. Additionally, Hibernate is a standard implementation of the JPA specification, with a few additional features that are specific to Hibernate. Let’s take a look at some core features of JPA and Hibernate.
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Defining Entities
- Defining JPA Entities
- Hibernate Entity Lifecycle
- JPA Entity Lifecycle Events
- Default Column Values in JPA
- JPA @Basic Annotation
- Mapping Entity Class Names to SQL Table Names with JPA
- Difference Between @Size, @Length, and @Column(length=value)
- JPA Entity Equality
- Jpa @Embedded and @Embeddable
- JPA Attribute Converters
- Hibernate @NotNull vs @Column(nullable = false)
- Defining Unique Constraints in JPA
- JPA Entities and the Serializable Interface
- Hibernate – Mapping Date and Time
- Using Java Records with JPA
- Persisting Enums in JPA
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Entity Relationships
- One-to-One Relationship in JPA
- Many-To-Many Relationship in JPA
- @JoinColumn Annotation Explained
- Difference Between @JoinColumn and mappedBy
- Mapping a Single Entity to Multiple Tables in JPA
- Overview of JPA/Hibernate Cascade Types
- Hibernate @WhereJoinTable Annotation
- Hibernate Inheritance Mapping
- Hibernate One to Many Annotation Tutorial
- Understanding JPA/Hibernate Associations
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Identifiers
- An Overview of Identifiers in Hibernate/JPA
- Composite Primary Keys in JPA
- When Does JPA Set the Primary Key
- Generate UUIDs as Primary Keys With Hibernate
- Returning an Auto-Generated Id with JPA
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Read Operations
- Types of JPA Queries
- JPA Query Parameters Usage
- Constructing a JPA Query Between Unrelated Entities
- Working with Lazy Element Collections in JPA
- JPA Join Types
- FetchMode in Hibernate
- Hibernate Named Query
- Optimistic Locking in JPA
- Pessimistic Locking in JPA
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Query Criteria
- Combining JPA And/Or Criteria Predicates
- Criteria API – An Example of IN Expressions
- JPA Criteria Queries
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Pagination and Sorting
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Query Results
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Write Operations
- INSERT Statement in JPA
- Batch Insert/Update with Hibernate/JPA
- Deleting Objects with Hibernate
- Hibernate: save, persist, update, merge, saveOrUpdate
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