JPA Tips: Avoiding the N + 1 select problem

Introduction ORM frameworks like JPA simplifies our development process by helping us to avoid lots of boilerplate code during the…

Read More »

Spring Boot & JPA & Hibernate & Oracle

In this tutorial we show how to create a Spring Boot application that communicates with an Oracle data source through…

Read More »

Spring Data JPA Example with Spring Boot

1. Introduction In this post, we shall demonstrate how to leverage the powerful Spring Data JPA APIs to interact with…

Read More »

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 entity properties. Recently, thanks…

Read More »

JPA persistence.xml SQL script definitions

You can define and link to SQL scripts in a JPA persistence context definition that will be executed at runtime.…

Read More »

Access the EntityManager from Spring Data JPA

Spring Data JPA allows you to rapidly develop your data access layer through the use of Repository interfaces. Occasionally you…

Read More »

Understanding the first level JPA cache

I can bet that every Java developer at least heard about L1 (aka EntityManager or Session) cache. But is your level…

Read More »

Dealing with Java’s LocalDateTime in JPA

A few days ago I ran into a problem while dealing with a LocalDateTime attribute in JPA. In this blog post…

Read More »

Spring Data with JPA and @NamedQueries

If you use Spring Data and @NamedQuery annotations at your JPA entity you can easily use them in a more…

Read More »