我有一个小的Spring Batch应用程序示例，第一次启动时可以正常工作，但每当我关闭应用程序并重新启动jar时，我总是得到这个错误：

Caused by: org.springframework.dao.DuplicateKeyException: PreparedStatementCallback; SQL [INSERT into BATCH_JOB_INSTANCE(JOB_INSTANCE_ID, JOB_NAME, JOB_KEY, VERSION) values (?, ?, ?, ?)]; Duplicate entry '1' for key 1; nested exception is com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException: Duplicate entry '1' for key 1

我不确定我是否把作业增量器设置错了。但是就像我说的，我可以启动它，然后使用web服务url /jobLauncher.html来调用批处理进程任意次数。只有在我关闭应用程序并重新启动它之后，我才得到这个错误。它想使用id 1作为作业执行表，但是id 1在以前的运行中已经存在了。
主类

@EnableAutoConfiguration
@ComponentScan
public class Application {

    public static void main(String[] args) throws Exception {
        SpringApplication.run(Application.class, new String[]{ "date=" + System.currentTimeMillis() });
    }
}

Web服务类

@Controller
public class JobLauncherController {

    @Autowired
    JobLauncher jobLauncher;

    @Autowired
    Job job;

    @RequestMapping("/jobLauncher.html")
    @ResponseBody
    public String handle() throws Exception{
        jobLauncher.run(job, new JobParametersBuilder().addString("date", System.currentTimeMillis() + "").toJobParameters());
        return "Started the batch...";
    }
}

Spring Batch类

@Configuration
@EnableBatchProcessing
public class SampleBatchApplication {

    @Autowired
    private JobBuilderFactory jobs;

    @Autowired
    private StepBuilderFactory steps;

    @Bean
    protected Tasklet tasklet() {
        return new Tasklet() {
            @Override
            public RepeatStatus execute(StepContribution contribution,
                                        ChunkContext context) {
                return RepeatStatus.FINISHED;
            }
        };
    }

    @Bean
    public Job job() throws Exception {
        return this.jobs.get("job")
                   .incrementer(new RunIdIncrementer())
                   .flow(this.step1())
                   .end()
                   .build();
    }

    @Bean
    protected Step step1() throws Exception {
        return this.steps.get("step1").tasklet(this.tasklet()).build();
    }

    @Bean
    public DataSource dataSource() {

        BasicDataSource ds = new BasicDataSource();

        try {
            ds.setDriverClassName("com.mysql.jdbc.Driver");
            ds.setUsername("test");
            ds.setPassword("test");
            ds.setUrl("jdbc:mysql://127.0.0.1:3306/spring-batch");

        } catch (Exception e) {
            e.printStackTrace();
        }
        return ds;
    }
}