Spring Batch - Configuration

While writing a Spring Batch apppcation, we will configure the job, step, JobLauncher, JobRepository, Transaction Manager, readers, and writers using the XML tags provided in the Spring Batch namespace. Therefore, you need to include this namespace in your XML file as shown below.

<beans xmlns = "http://www.springframework.org/schema/beans" 
   xmlns:batch = "http://www.springframework.org/schema/batch" 
   xmlns:xsi = "http://www.w3.org/2001/XMLSchema-instance" 
   xsi:schemaLocation = "http://www.springframework.org/schema/batch 

   http://www.springframework.org/schema/batch/spring-batch-2.2.xsd 
   http://www.springframework.org/schema/bean   
   http://www.springframework.org/schema/beans/spring-beans-3.2.xsd"> 

In the following sections, we will discuss the various tags, their attributes and examples, available in the Spring Batch namespace.

Job

This tag is used to define/configure the job of the SpringBatch. It contains a set of steps and it can be launched using the JobLauncher.

This tag has 2 attributes as psted below −

Following is the XML configuration of the job of a SpringBatch.

<job id = "jobid" restartable = "false" > 
   . . . . . . . .  
   . . . . . . . .  
   . . . . . . . . // Step definitions 
</job>

Step

This tag is used to define/configure the steps of a SpringBatch job. It has the following three attributes −

Following is the XML configuration of the step of a SpringBatch.

<job id = "jobid"> 
   <step id = "step1" next = "step2"/> 
   <step id = "step2" next = "step3"/> 
   <step id = "step3"/> 
</job>

Chunk

This tag is used to define/configure a chunk of a tasklet. It has the following four attributes −

Following is the XML configuration of the chunk of a SpringBatch.

<batch:step id = "step1"> 
   <batch:tasklet> 
      <batch:chunk reader = "xmlItemReader" 
         writer = "mysqlItemWriter" processor = "itemProcessor" commit-interval = "10"> 
      </batch:chunk> 
   </batch:tasklet> 
</batch:step> 

JobRepository

The JobRepository Bean is used to configure the JobRepository using a relational database. This bean is associated with the class of type org.springframework.batch.core.repository.JobRepository.

Following is the example configuration of the JobRepository.

<bean id = "jobRepository" 
   class = "org.springframework.batch.core.repository.support.JobRepositoryFactoryBean"> 
   <property name = "dataSource" ref = "dataSource" /> 
   <property name = "transactionManager" ref="transactionManager" /> 
   <property name = "databaseType" value = "mysql" /> 
</bean> 

JobLauncher

The JobLauncher bean is used to configure the JobLauncher. It is associated with the class org.springframework.batch.core.launch.support.SimpleJobLauncher (in our programs). This bean has one property named jobrepository, and it is used to specify the name of the bean which defines the jobrepository.

Following is the example configuration of the jobLauncher.

<bean id = "jobLauncher" 
   class = "org.springframework.batch.core.launch.support.SimpleJobLauncher"> 
   <property name = "jobRepository" ref = "jobRepository" /> 
</bean>

TransactionManager

The TransactionManager bean is used to configure the TransactionManager using a relational database. This bean is associated with the class of type org.springframework.transaction.platform.TransactionManager.

<bean id = "transactionManager"
   class = "org.springframework.batch.support.transaction.ResourcelessTransactionManager" />

DataSource

The datasource bean is used to configure the Datasource. This bean is associated with the class of type org.springframework.jdbc.datasource.DriverManagerDataSource.

Following is the example configuration of the datasource.

<bean id = "dataSource" 
   class = "org.springframework.jdbc.datasource.DriverManagerDataSource"> 
   <property name = "driverClassName" value = "com.mysql.jdbc.Driver" /> 
   <property name = "url" value = "jdbc:mysql://localhost:3306/details" /> 
   <property name = "username" value = "myuser" /> 
   <property name = "password" value = "password" /> 
</bean>