Professional Java for Web Applications

Chapter 21Using JPA in Spring Framework Repositories

IN THIS CHAPTER

• Understanding Spring repositories and taking advantage of transactions
• Setting up persistence in Spring Framework
• Implementing and using JPA repositories
• Converting data with DTOs and entities

WROX.COM CODE DOWNLOADS FOR THIS CHAPTER

You can find the wrox.com code downloads for this chapter at http://www.wrox.com/go/projavaforwebapps on the Download Code tab. The code for this chapter is divided into the following major examples:

• Spring-JPA Project
• Customer-Support-v15 Project

NEW MAVEN DEPENDENCIES FOR THIS CHAPTER

In addition to the Maven dependencies introduced in previous chapters, you also need the following Maven dependency:

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-orm</artifactId>
            <version>4.0.0</version>
            <scope>compile</scope>
        </dependency>
 
        <dependency>
            <groupId>org.javassist</groupId>
            <artifactId>javassist</artifactId>
            <version>3.18.1-GA</version>
            <scope>runtime</scope>
        </dependency>

USING SPRING REPOSITORIES AND TRANSACTIONS

Before Object-Relational Mappers became so common and the JPA Persistence API was first released, Spring Framework’s org.springframework.jdbc.core.JdbcTemplate provided a standard, simplified way to persist and retrieve entities using JDBC in Spring Framework applications. In addition to making table-to-entity translation easier, the JdbcTemplate also recognized the various vendor-specific SQLExceptions and error codes that a JDBC driver could ...