How to map JSON collections using JPA and Hibernate

Introduction

The open-source hibernate-types project allows you to map Java objects or Jackson JsonNode as JPA or Hibernate entity properties, and, thanks to our awesome contributors, we have added support for storing type-safe JSON collections.

In this article, you are going to see how to achieve this goal.

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How to bootstrap JPA programmatically without the persistence.xml configuration file

Introduction

One of my Twitter followers asked me if there is any documentation for bootstrapping JPA programmatically so that we can replace the persistence.xml configuration file with a Java configuration:

Previously, I wrote an article about bootstrapping Hibernate without the persistence.xml, but that solution was based on the Hibernate-specific EntityManagerFactoryBuilderImpl.

In this article, I’m going to give you a solution that works with any JPA provider since it’s based on standard Java Persistence API.

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How to map a JPA @ManyToOne relationship to a SQL query using the Hibernate @JoinFormula annotation

Introduction

Someone asked me to answer the following StackOverflow question, and, because the question is very interesting from an SQL perspective, I decided to turn the answer it into a blog post.

In this article, we are going to see how to map a JPA @ManyToOne association to the result of a SQL query using the Hibernate-specific @JoinFormula annotation.

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