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Optimistic Locking in JPA 1. Introduction When it comes to enterprise applications, it’s crucial to manage concurrent access to a database properly. This means we should be able to handle multiple transactions in an effective and most importantly, error-proof way. What’s more, we need to ensure that data stays consistent… Continue Reading jpa-optimistic-locking

JPA Attribute Converters 1. Introduction In this quick article, we’ll cover the usage of the Attribute Converters available in JPA 2.1 – which, simply put, allow us to map JDBC types to Java classes. We’ll use Hibernate 5 as our JPA implementation here. 2. Creating a Converter We’re going to… Continue Reading jpa-attribute-converters

Spring Data JPA Repository Populators 1. Introduction In this quick article, we’ll explore Spring JPA Repository Populators with a quick example. The Spring Data JPA repository populator is a great alternative for data.sql script. Spring Data JPA repository populator supports JSON and XML file formats. In the following sections, we’ll… Continue Reading spring-data-jpa-repository-populators

Spring Data JPA Delete and Relationships 1. Overview In this tutorial, we’ll have a look at how deleting is done in Spring Data JPA. 2. Sample Entity As we know from the Spring Data JPA reference documentation, repository interfaces provide us some basic support for entities. If we have an… Continue Reading spring-data-jpa-delete

Spring JPA – Multiple Databases 1. Overview In this tutorial, we’ll implement a simple Spring configuration for a Spring Data JPA system with multiple databases. Further reading: Spring Data JPA – Derived Delete Methods Learn how to define Spring Data deleteBy and removeBy methods Read more → Configuring a DataSource… Continue Reading spring-data-jpa-multiple-databases

Overview of JPA/Hibernate Cascade Types 1. Introduction In this tutorial, we’ll discuss what cascading is in JPA/Hibernate. Then we’ll cover the various cascade types that are available, along with their semantics. 2. What is Cascading? Entity relationships often depend on the existence of another entity — for example, the Person–Address… Continue Reading jpa-cascade-types

JPA Join Types 1. Overview In this tutorial, we’ll look at different join types supported by JPA. For that purpose, we’ll use JPQL, a query language for JPA. 2. Sample Data Model Let’s look at our sample data model that we’ll use in the examples. Firstly, we’ll create an Employee… Continue Reading jpa-join-types

A Guide to Querydsl with JPA 1. Overview Querydsl is an extensive Java framework, which helps with creating and running type-safe queries in a domain specific language that is similar to SQL. In this article we’ll explore Querydsl with the Java Persistence API. A quick side note here is that… Continue Reading querydsl-with-jpa-tutorial

Sorting with JPA 1. Overview This article illustrates the various way JPA can be used for sorting. Further reading: Spring Data JPA @Query Learn how to use the @Query annotation in Spring Data JPA to define custom queries using JPQL and native SQL. Read more → JPA Attribute Converters Take… Continue Reading jpa-sort