Spring Data - JPA

Implementing a data access layer of an application has been cumbersome for quite a while. Too much boilerplate code has to be written to execute simple queries as well as perform pagination, and auditing. Spring JPA aims to significantly improve the implementation of data access layers by reducing the effort to the amount that's actually needed. As a developer you write your repository interfaces, including custom finder methods, and Spring will provide the implementation automatically. (Note, this approach is not limited to JPA and has been applied to other persistance stores such as MongoDB and Neo4j as part of the Spring MongoDB and Spring Neo4j projects).

Spring JPA also takes the concept of a specification from Eric Evans' book Domain Driven Design, that carries the same semantics and provides an API to define such Specifications using the JPA criteria API.

Note, this project evolved out of the Hades open source project.

Features

• Sophisticated support to build repositories based on Spring and JPA
• Support for QueryDSL predicates and thus type-safe JPA queries
• Transparent auditing of domain class
• Pagination support, dynamic query execution, ability to integrate custom data access code
• Validation of @Query annotated queries at bootstrap time
• Support for XML based entity mapping

Latest News

• Spring Data JPA 1.1.0 RC1 and 1.0.3 GA released (Feb 9th, 2012)
• Spring Data JPA - 1.0.1.RELEASE and 1.1.0.M1 Released (Sept 6, 2011)
• Webinar: Introduction to Spring Data JPA; Register - September 08, 1:00pm EST / 10:00am PST
• Spring Data JPA - 1.0.0.GA Released (July 21, 2011)
• Spring Data JPA - 1.0.0.RC1 Released (June 22, 2011)
• Spring Data JPA - 1.0.0.M2 Released (March 24, 2011)
• Spring Data JPA - 1.0.0.M1 Released (Feb 10, 2011)

Buzz

• Screencasts of IntelliJ integration, e.g. validation of finder method names on repositories.(Serega Vasiliev - IntelliJ)
• Fine-tuning Spring Data repositories (Oliver Gierke - SpringSource blog)
• Adding Queries to Spring Data JPA (Gordon Dickens blog)
• Simpler JPA with Spring Data JPA (Gordon Dickens blog)
• Setting up a Spring Data JPA Project (blog)
• Advanced Spring Data JPA - Specifications and Querydsl (Oliver Gierke - SpringSource blog)
• Using Spring Data JPA To Reduce Data Access Coding (Bruce Phillips blog)
• Getting Started with Spring Data JPA (Oliver Gierke - SpringSource blog)
• Hades - JPA Repositories Done Right (Oliver Gierke - InfoQ article)
• DZone - Creating an Application using Spring Data with Redis as Datastore

Resources

• Downloads
• Forum
• Examples

Maven Artifacts

Here is the Spring Milestone Repository:

<repository>
 <id>spring-milestone</id>
 <name>Spring Maven MILESTONE Repository</name>
 <url>http://repo.springsource.org/libs-milestone</url>
</repository>

Here is the dependency:

<dependency>
 <groupId>org.springframework.data</groupId>
 <artifactId>spring-data-jpa</artifactId>
 <version>1.0.3.RELEASE</version>
</dependency> 

<repository>
 <id>spring-snapshot</id>
 <name>Spring Maven SNAPSHOT Repository</name>
 <url>http://repo.springsource.org/libs-snapshot</url>
</repository>

<dependency>
 <groupId>org.springframework.data</groupId>
 <artifactId>spring-data-jpa</artifactId>
 <version>1.1.0.BUILD-SNAPSHOT</version>
</dependency>