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

    private static final Logger LOGGER = LoggerFactory.getLogger(BatchConfig.class);


    @Bean
    public Job importUserJob(JobBuilderFactory jobs, Step s1, JobExecutionListener listener) {
        return jobs.get("importUserJob")
                .incrementer(new RunIdIncrementer())
                .listener(listener)
                .flow(s1)
                .end()
                .build();
    }

    @Bean
    public Step step1(StepBuilderFactory stepBuilderFactory, ItemReader reader,
                      ItemWriter writer, ItemProcessor processor) {
        return stepBuilderFactory.get("step1")
                .chunk(5)
                .reader(reader)
                .processor(processor)
                .writer(writer)
                .build();
    }

    @Bean
    public JdbcTemplate jdbcTemplate(DataSource dataSource) {
        return new JdbcTemplate(dataSource);
    }

    @Bean
    public ItemReader reader(DataSource dataSource) {
        JdbcCursorItemReader reader = new JdbcCursorItemReader();
        reader.setSql("select id, first_name, last_name, random_num from reader");
        reader.setDataSource(dataSource);
        reader.setRowMapper(
                (ResultSet resultSet, int rowNum) -> {
                    LOGGER.info("RowMapper resultset: {}", resultSet);
                    if (!(resultSet.isAfterLast()) && !(resultSet.isBeforeFirst())) {
                        RecordSO recordSO = new RecordSO();
                        recordSO.setFirstName(resultSet.getString("first_name"));
                        recordSO.setLastName(resultSet.getString("last_name"));
                        recordSO.setId(resultSet.getLong("id"));
                        recordSO.setRandomNum(resultSet.getString("random_num"));

                        LOGGER.info("RowMapper record : {}", recordSO);
                        return recordSO;
                    } else {
                        LOGGER.info("Returning null from rowMapper");
                        return null;
                    }
                });
        return reader;
    }

    @Bean
    public ItemPreparedStatementSetter setter() {
        return (item, ps) -> {
            ps.setLong(1, item.getId());
            ps.setString(2, item.getFullName());
            ps.setString(3, item.getRandomNum());
        };
    }

    @Bean
    public ItemProcessor processor() {
        return new RecordProcessor();
    }

    @Bean
    public ItemWriter writer(DataSource dataSource, ItemPreparedStatementSetter setter) {
        JdbcBatchItemWriter writer = new JdbcBatchItemWriter<>();
        writer.setItemSqlParameterSourceProvider(new BeanPropertyItemSqlParameterSourceProvider());
        writer.setItemPreparedStatementSetter(setter);
        writer.setSql("insert into writer (id, full_name, random_num) values (?,?,?)");
        writer.setDataSource(dataSource);
        return writer;
    }
}

@Entity
@Table(name = "reader")
public class RecordSO {

    @Id
    @GeneratedValue(strategy=GenerationType.IDENTITY)
    private Long id;

    private String firstName;
    private String lastName;
    private String randomNum;

    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    public String getFirstName() {
        return firstName;
    }

    public void setFirstName(String firstName) {
        this.firstName = firstName;
    }

    public String getLastName() {
        return lastName;
    }

    public void setLastName(String lastName) {
        this.lastName = lastName;
    }

    public String getRandomNum() {
        return randomNum;
    }

    public void setRandomNum(String randomNum) {
        this.randomNum = randomNum;
    }
}

@Entity
@Table(name = "writer")
public class WriterSO {

    @Id
    @GeneratedValue(strategy=GenerationType.IDENTITY)
    private Long id;
    private String fullName;
    private String randomNum;

    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    public String getFullName() {
        return fullName;
    }

    public void setFullName(String fullName) {
        this.fullName = fullName;
    }

    public String getRandomNum() {
        return randomNum;
    }

    public void setRandomNum(String randomNum) {
        this.randomNum = randomNum;
    }
}

spring.datasource.driverClassName=org.postgresql.Driver
spring.datasource.url=jdbc:postgresql://192.168.99.100:5432/batch
spring.datasource.username=postgres
spring.datasource.password=mypwd

##spring.jpa.database-platform=org.hibernate.dialect.PostgreSQLDialect
spring.jpa.show-sql=true
spring.jpa.generate-ddl=true
spring.jpa.hibernate.ddl-auto=create-drop
spring.jpa.properties.hibernate.dialect=org.hibernate.dialect.PostgreSQLDialect

public class RecordProcessor implements ItemProcessor {

    private static final Logger LOGGER = LoggerFactory.getLogger(RecordProcessor.class);

    @Override
    public WriterSO process(RecordSO item) throws Exception {
        LOGGER.info("Processing Record: {}", item);
        WriterSO writerSo = new WriterSO();
        writerSo.setId(item.getId());
        writerSo.setFullName(item.getFirstName() + " " + item.getLastName());
        writerSo.setRandomNum(String.valueOf(Math.random()).substring(3, 8));
        LOGGER.info("Processed Writer: {}", writerSo);
        return writerSo;
    }
}

spring-boot-batch-starter-example

spring-batch

spring-batch-admin-spring-boot

spring-batch-tutorial-with-spring-boot-and-java-configuration