List/Grid Tag Archives: JPA

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JPA Tutorial – Setting Up JPA in a Java SE Environment

JPA stands for Java Persistence API, which basically is a specification that describes a way to persist data into a persistent storage, usually a database. We can think of it as ...
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Compile-time checking JPA queries

JPA provides several alternatives for querying data. Such alternatives may be classified attending to a variety of criteria, eg, language used (SQL vs JPQL) or whether queries are static ...
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A beginner’s guide to JPA/Hibernate flush strategies

Introduction In my previous post I introduced the entity state transitions Object-relational mapping paradigm. All managed entity state transitions are translated to associated database ...
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From JPA to Hibernate’s legacy and enhanced identifier generators

JPA identifier generators JPA defines the following identifier strategies:                Strategy DescriptionAUTO The persistence provider ...
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Using @NamedEntityGraph to load JPA entities more selectively in N+1 scenarios

The N+1 problem is a common issue when working with ORM solutions. It happens when you set the fetchType for some @OneToMany relation to lazy, in order to load the child entities only ...
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Testing with Aliens: How to test a JPA type converter with Arquillian

This post was written together with +Aslak Knutsen (@aslakknutsen). JPA type converters provide an easy way to define how an entity attribute gets persisted to the database. You can ...
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How to use a JPA Type Converter to encrypt your data

A few days ago, I read an interesting article by Bear Giles about Database encryption using JPA listeners from 2012. He discusses his requirement for an encryption solution and provides ...
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JPA 2.1 Entity Graph – Part 2: Define lazy/eager loading at runtime

This is my second post on JPA 2.1 Entity Graphs. The first post described the usage of named entity graphs. These can be used to define a graph of entities and/or attributes at compile ...
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JPA 2.1 Type Converter – The better way to persist enums

Persisting enums with JPA 2.0 is possible, but there is no nice way to do it. Using the @Enumerated annotation, you can use EnumType.ORDINAL or EnumType.STRING to map the enum value ...
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SpringMVC4 + Spring Data JPA + SpringSecurity configuration using JavaConfig

In this article we will see how to configure and integrate SpringMVC4, Spring Data JPA with Hibernate and SpringSecurity using JavaConfig. 1. First let’s configure all the necessary ...
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