Introduction to Spring Batch.

1. Introduction

In this article we're going to focus on a practical, code-focused intro to Spring Batch. Spring Batch is a processing framework designed for robust execution of jobs.

It's current version 3.0, which supports Spring 4 and Java 8. It also accommodates JSR-352, which is new java specification for batch processing. current version 3.0, which supports Spring 4 and Java 8. It also accommodates JSR-352, which is new java specification for batch processing.

2. Workflow Basics

Spring batch follows the traditional batch architecture where a job repository does the work of scheduling and interacting with the job.

A job can have more than one steps – and every step typically follows the sequence of reading data, processing it and writing it.

And of course the framework will do most of the heavy lifting for us here – especially when it comes to the low level persistence work of dealing with the jobs – using sqlite for the job repository.

2.1. Our Example Usecase

The simple usecase we're going to tackle here is – we're going to migrate some financial transaction data from CSV to XML.

The input file has a very simple structure – it contains a transaction per line, made up of: a username, the user id, the date of the transaction and the amount:

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username, userid, transaction_date, transaction_amount devendra, 1234, 31/10/2015, 10000 john, 2134, 3/12/2015, 12321 robin, 2134, 2/02/2015, 23411

3. The Maven POM

Dependencies required for this project are spring core, spring batch, and sqlite jdbc connector:

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<project xmlns="http://maven.apache.org/POM/4.0.0"   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"   xsi:schemaLocation="http://maven.apache.org/POM/4.0.0   http://maven.apache.org/xsd/maven-4.0.0.xsd">     <modelVersion>4.0.0</modelVersion>       <groupId>org.baeldung</groupId>     <artifactId>spring-batch-intro</artifactId>     <version>0.1-SNAPSHOT</version>     <packaging>jar</packaging>       <name>spring-batch-intro</name>     <url>http://maven.apache.org</url>       <properties>         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>         <spring.version>4.2.0.RELEASE</spring.version>         <spring.batch.version>3.0.5.RELEASE</spring.batch.version>         <sqlite.version>3.8.11.2</sqlite.version>     </properties>       <dependencies>         <!-- SQLite database driver -->         <dependency>             <groupId>org.xerial</groupId>             <artifactId>sqlite-jdbc</artifactId>             <version>${sqlite.version}</version>         </dependency>         <dependency>             <groupId>org.springframework</groupId>             <artifactId>spring-oxm</artifactId>             <version>${spring.version}</version>         </dependency>         <dependency>             <groupId>org.springframework</groupId>             <artifactId>spring-jdbc</artifactId>             <version>${spring.version}</version>         </dependency>         <dependency>             <groupId>org.springframework.batch</groupId>             <artifactId>spring-batch-core</artifactId>             <version>${spring.batch.version}</version>         </dependency>     </depend <dependencies> </project>