org.springframework.batch.core.configuration.annotation

Annotation Type EnableBatchProcessing

@Target(value=TYPE)
 @Retention(value=RUNTIME)
 @Documented
 @Import(value=BatchConfigurationSelector.class)
public @interface EnableBatchProcessing

Enable Spring Batch features and provide a base configuration for setting up batch jobs in an @Configuration class, roughly equivalent to using the <batch:*> XML namespace.

 @Configuration
 @EnableBatchProcessing
 @Import(DataSourceConfiguration.class)
 public class AppConfig {

        @Autowired
        private JobBuilderFactory jobs;

        @Bean
        public Job job() {
                return jobs.get("myJob").start(step1()).next(step2()).build();
        }

        @Bean
    protected Step step1() {
       ...
    }

        @Bean
    protected Step step2() {
     ...
    }
 }
 

The user should to provide a DataSource as a bean in the context, or else implement BatchConfigurer in the configuration class itself, e.g.

 @Configuration
 @EnableBatchProcessing
 public class AppConfig extends DefaultBatchConfigurer {

    @Bean
    public Job job() {
       ...
    }

    @Override
    protected JobRepository createJobRepository() {
       ...
    }

  ...

 }
 

If a user does not provide a DataSource within the context, a Map based JobRepository will be used. If multiple DataSources are defined in the context, the one annotated with Primary will be used (Note that if none of them is annotated with Primary, the one named dataSource will be used if any, otherwise a UnsatisfiedDependencyException will be thrown). Note that only one of your configuration classes needs to have the @EnableBatchProcessing annotation. Once you have an @EnableBatchProcessing class in your configuration you will have an instance of StepScope and JobScope so your beans inside steps can have @Scope("step") and @Scope("job") respectively. You will also be able to @Autowired some useful stuff into your context:

• a JobRepository (bean name "jobRepository" of type SimpleJobRepository)
• a JobLauncher (bean name "jobLauncher" of type SimpleJobLauncher)
• a JobRegistry (bean name "jobRegistry" of type MapJobRegistry)
• a JobExplorer (bean name "jobExplorer" of type SimpleJobExplorer)
• a PlatformTransactionManager (bean name "transactionManager")
• a JobBuilderFactory (bean name "jobBuilders") as a convenience to prevent you from having to inject the job repository into every job, as in the examples above
• a StepBuilderFactory (bean name "stepBuilders") as a convenience to prevent you from having to inject the job repository and transaction manager into every step

The transaction manager provided by this annotation will be of type:

• ResourcelessTransactionManager if no DataSource is provided within the context
• DataSourceTransactionManager if a DataSource is provided within the context

In order to use a custom transaction manager, a custom BatchConfigurer should be provided. For example:

 @Configuration
 @EnableBatchProcessing
 public class AppConfig extends DefaultBatchConfigurer {

    @Bean
    public Job job() {
       ...
    }

    @Override
    public PlatformTransactionManager getTransactionManager() {
       return new MyTransactionManager();
    }

  ...

 }
 

If the configuration is specified as modular=true then the context will also contain an AutomaticJobRegistrar. The job registrar is useful for modularizing your configuration if there are multiple jobs. It works by creating separate child application contexts containing job configurations and registering those jobs. The jobs can then create steps and other dependent components without needing to worry about bean definition name clashes. Beans of type ApplicationContextFactory will be registered automatically with the job registrar. Example:

 @Configuration
 @EnableBatchProcessing(modular=true)
 public class AppConfig {

    @Bean
    public ApplicationContextFactory someJobs() {
       return new GenericApplicationContextFactory(SomeJobConfiguration.class);
    }

    @Bean
    public ApplicationContextFactory moreJobs() {
       return new GenericApplicationContextFactory(MoreJobConfiguration.class);
    }

  ...

 }
 

Note that a modular parent context in general should not itself contain @Bean definitions for job, especially if a BatchConfigurer is provided, because cyclic configuration dependencies are otherwise likely to develop.

For reference, the first example above can be compared to the following Spring XML configuration:

 <batch>
     <job-repository />
     <job id="myJob">
       <step id="step1" .../>
       <step id="step2" .../>
     </job>
     <beans:bean id="transactionManager" .../>
     <beans:bean id="jobLauncher" class="org.springframework.batch.core.launch.support.SimpleJobLauncher">
       <beans:property name="jobRepository" ref="jobRepository" />
     </beans:bean>
 </batch>
 
 

Author:

Dave Syer, Mahmoud Ben Hassine

Optional Element Summary

Optional Elements

Modifier and Type	Optional Element and Description
boolean	modular Indicate whether the configuration is going to be modularized into multiple application contexts.

Element Detail

modular

public abstract boolean modular

Indicate whether the configuration is going to be modularized into multiple application contexts. If true then you should not create any @Bean Job definitions in this context, but rather supply them in separate (child) contexts through an ApplicationContextFactory.

Returns:

boolean indicating whether the configuration is going to be modularized into multiple application contexts. Defaults to false.

Default:

false