How to avoid Spring batch persistence of metadata in DB

Question

I have a Spring batch job that reads from a DB and writes into a CSV. The batch job is trying to use the DB from which I am reading to save the status of the batch processin

Answer 1

As far as I know, disabling metadata persistence is not possible. A possible workaround for not having to setup a 'proper' database is to use an in-memory database for the metadata:

pom.xml

    <dependency>
        <groupId>com.h2database</groupId>
        <artifactId>h2</artifactId>
    </dependency>

However, there is the problem of using the default Spring Datasource for the Spring Batch Jobs Metadata repository. Here there is a complete workaround in order to define a secondary datasource for it:

application.properties

###################################
### JOBS DATASOURCE PROPERTIES. ###
###################################
## URL used to connect to the jobs database.
spring.secondDatasource.url=jdbc:h2:mem:jobsdb;DB_CLOSE_DELAY=-1;DB_CLOSE_ON_EXIT=FALSE
## Driver class used to connect to the jobs database (it will depend on datasource).
spring.secondDatasource.driver-class-Name=org.h2.Driver
## User name 
spring.secondDatasource.username=xxx
## Password 
spring.secondDatasource.password=xxx
## Datasource configuration for jobs database.
spring.jpa.hibernate.ddl-auto=create-drop
spring.secondDatasource.initialize=true
spring.secondDatasource.test-on-borrow=true
spring.secondDatasource.validation-query=select 1

Spring Configuration (I) Datasources

/**
 * Config class holding several datasources, one business related, other for the spring batch jobs
 */
@Configuration
public class DataSourceConfiguration
{
    @Bean
    @Qualifier("businessDataSource")
    @ConfigurationProperties(prefix = "spring.datasource")
    public DataSource primaryDataSource()
    {
        return DataSourceBuilder.create().build();
    }

    @Bean
    @Primary
    @Qualifier("jobsDataSource")
    @ConfigurationProperties(prefix = "spring.secondDatasource")
    public DataSource secondaryDataSource()
    {
        return DataSourceBuilder.create().build();
    }
}

Spring Configuration (II) - Spring batch

import org.springframework.batch.core.configuration.annotation.DefaultBatchConfigurer;

// Another @Configuration class...

@Autowired
@Qualifier("jobsDataSource")
private DataSource dataSource;

@Bean
public BatchConfigurer configurer()
{
    // This is required to avoid problems when jobs datasource is into some secondary datasource.
    return new DefaultBatchConfigurer(dataSource);
}

With all this, Spring Batch will use the in-memory datasource, while you are free to use the default datasource for your own purposes