我在spring批处理应用程序中有一个作业已成功完成，但完成后，其线程将进入等待状态。随着越来越多的作业示例被执行，tomcat的线程数量也在不断增加。
以下是作业配置：

@Bean
@Scope("singleton")
@Qualifier(value = "job1")
public Job job() {
    return jobBuilderFactory.get("job1")
            .incrementer(new RunIdIncrementer())
            .flow(step1())
            .end()
            .preventRestart()
            .build();
}

@Bean
public Step step1() {
    return stepBuilderFactory.get("step1")
            .<Buylead, Buylead>chunk(10000)
            .reader(itemReader())
            .writer(itemWriter())
            .build();
}

public JdbcCursorItemReader<Buylead> itemReader() {
    JdbcCursorItemReader<Buylead> reader = new JdbcCursorItemReader<>();

    reader.setDataSource(dataSource);
    reader.setSql(" --- WHatever Query ----");
    reader.setRowMapper(new MapperBL());

    return reader;
}

public ItemWriter<Buylead> itemWriter(){
    FlatFileItemWriter<Buylead> itemWriter = new FlatFileItemWriter() ;

    itemWriter.setResource(new FileSystemResource("output/buyleadSolrDoc.xls"));
    itemWriter.setLineAggregator(new DelimitedLineAggregator<Buylead>() { {
                setFieldExtractor(new BeanWrapperFieldExtractor<Buylead>() { {
                    setNames(new String[] {***************}); } }); } });
    itemWriter.setShouldDeleteIfEmpty(true);
    return itemWriter;
}

数据源保存在另一个配置类中。
这是主要课程

@SpringBootApplication
@EnableBatchProcessing
public class Application  extends DefaultBatchConfigurer{

    public static void main(String[] args) {
        SpringApplication.run(SearchApplication.class, args);
    }

    @Override
    public void setDataSource(DataSource dataSource) {
        // override to do not set datasource even if a datasource exist.
        // initialize will use a Map based JobRepository (instead of database)
    }

}

作业正在成功执行。但是它的线程进入等待状态。
下面是应用程序的threaddump部分

http-nio-8080-exec-2" #22 daemon prio=5 os_prio=0 cpu=0.11ms elapsed=29.43s tid=0x00007fcb6d6ddd60 nid=0xc724 waiting on condition  [0x00007fcae3ffe000]
   java.lang.Thread.State: WAITING (parking)
    at jdk.internal.misc.Unsafe.park(java.base@15.0.1/Native Method)
    - parking to wait for  <0x0000000713c00710> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
    at java.util.concurrent.locks.LockSupport.park(java.base@15.0.1/LockSupport.java:341)
    at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionNode.block(java.base@15.0.1/AbstractQueuedSynchronizer.java:505)
    at java.util.concurrent.ForkJoinPool.managedBlock(java.base@15.0.1/ForkJoinPool.java:3137)
    at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(java.base@15.0.1/AbstractQueuedSynchronizer.java:1614)
    at java.util.concurrent.LinkedBlockingQueue.take(java.base@15.0.1/LinkedBlockingQueue.java:435)
    at org.apache.tomcat.util.threads.TaskQueue.take(TaskQueue.java:108)
    at org.apache.tomcat.util.threads.TaskQueue.take(TaskQueue.java:33)
    at java.util.concurrent.ThreadPoolExecutor.getTask(java.base@15.0.1/ThreadPoolExecutor.java:1056)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(java.base@15.0.1/ThreadPoolExecutor.java:1116)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(java.base@15.0.1/ThreadPoolExecutor.java:630)
    at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
    at java.lang.Thread.run(java.base@15.0.1/Thread.java:832)*

请建议关闭处于公园状态的线程的方法。