How to use a JVM or database auto-generated UUID identifier with JPA and Hibernate

Introduction

Inspired by this comment on my blog, in this article, we are going to see how to use a UUID entity identifier that is auto-generated by Hibernate either in the JVM or using database-specific UUID functions.

Our Post entity looks as follows:

The Post entity has a UUID identifier and a title. Now, let’s see how we can map the Post entity so that the UUID identifier be auto-generated for us.

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How to use database-specific or Hibernate-specific features without sacrificing portability

Introduction

Like other non-functional requirements, portability is a feature. While portability is very important when working on an open-source framework that will be used in a large number of setups, for end systems, portability might not be needed at all.

This article aims to explain that you don’t have to avoid database or framework-specific features if you want to achieve portability.

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How to customize the Jackson ObjectMapper used by Hibernate-Types

Introduction

As already explained, the hibernate-types open-source project allows you to map JSON, ARRAY when using JPA and Hibernate.

Since I launched this project, one of the most wanted feature was to add support for customizing the underlying Jackson ObjectMappper, and since version 2.1.1, this can be done either declaratively or programmatically.

In this article, you are going to see how do customize the ObjectMappper when using the hibernate-types project.

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How to get the actual execution plan for an Oracle SQL query using Hibernate query hints

Introduction

While answering this question on the Hibernate forum, I realized that it’s a good idea to write an article about getting the actual execution plan for an Oracle SQL query using Hibernate query hints feature.

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