Spring Batch helloworld java configuration #SpringBatch

SpringBatchConfiguration.java

package springbatch;

import common.Greeting;
import org.springframework.batch.core.Job;
import org.springframework.batch.core.Step;
import org.springframework.batch.core.configuration.annotation.EnableBatchProcessing;
import org.springframework.batch.core.configuration.annotation.JobBuilderFactory;
import org.springframework.batch.core.configuration.annotation.StepBuilderFactory;
import org.springframework.batch.core.launch.JobLauncher;
import org.springframework.batch.core.launch.support.SimpleJobLauncher;
import org.springframework.batch.core.repository.JobRepository;
import org.springframework.batch.core.repository.support.MapJobRepositoryFactoryBean;
import org.springframework.batch.core.step.tasklet.Tasklet;
import org.springframework.batch.item.ItemProcessor;
import org.springframework.batch.item.ItemReader;
import org.springframework.batch.item.ItemWriter;
import org.springframework.batch.item.file.FlatFileItemReader;
import org.springframework.batch.item.file.mapping.BeanWrapperFieldSetMapper;
import org.springframework.batch.item.file.mapping.DefaultLineMapper;
import org.springframework.batch.item.file.transform.DelimitedLineTokenizer;
import org.springframework.batch.support.transaction.ResourcelessTransactionManager;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Scope;
import org.springframework.core.io.ClassPathResource;
import org.springframework.transaction.PlatformTransactionManager;

/**
 * Spring Batch Hello World job java configuration.
 */
@Configuration
@EnableBatchProcessing
public class SpringBatchConfiguration {

    @Autowired
    private JobBuilderFactory jobBuilders;

    @Autowired
    private StepBuilderFactory stepBuilders;

    @Bean
    public PlatformTransactionManager transactionManager() {
        return new ResourcelessTransactionManager();
    }

    @Bean
    public JobRepository jobRepository() throws Exception {
        return new MapJobRepositoryFactoryBean(transactionManager()).getJobRepository();
    }

    @Bean
    public JobLauncher jobLauncher() throws Exception {
        SimpleJobLauncher jobLauncher = new SimpleJobLauncher();
        jobLauncher.setJobRepository(jobRepository());
        return jobLauncher;
    }

    @Bean
    @Scope("prototype")
    public Greeting greeting() {
        return new Greeting();
    }

    @Bean
    public ItemProcessor greetingProcessor() {
         return new GreetingProcessor();
    }

    @Bean
    public ItemWriter greetingWriter() {
        return new GreetingWriter();
    }

    @Bean
    public ItemReader greetingReader() {

        //configure line tokenizer
        DelimitedLineTokenizer delimitedLineTokenizer = new DelimitedLineTokenizer();
        delimitedLineTokenizer.setNames(new String[]{"id","name"});

        //configure field set mapper
        BeanWrapperFieldSetMapper fieldSetMapper = new BeanWrapperFieldSetMapper();
        fieldSetMapper.setPrototypeBeanName("greeting");

        //configure line mapper
        DefaultLineMapper defaultLineMapper = new DefaultLineMapper();
        defaultLineMapper.setLineTokenizer(delimitedLineTokenizer);
        defaultLineMapper.setFieldSetMapper(fieldSetMapper);

        //configure item reader
        FlatFileItemReader flatFileItemReader = new FlatFileItemReader();
        flatFileItemReader.setResource(new ClassPathResource("greetings.csv"));
        flatFileItemReader.setLineMapper(defaultLineMapper);
        return flatFileItemReader;

    }

    @Bean
    public Job job() {
        return jobBuilders.get("helloWorldJob").start(step1()).build();
    }

    @Bean
    public Step step1() {
        return stepBuilders.get("step1")
                .<Greeting, Greeting> chunk(10)
                .reader(greetingReader())
                .processor(greetingProcessor())
                .writer(greetingWriter()).build();
    }

}