transaction isolation level (READ UNCOMMITTED) of Spring Batch - sql-server

Question

I want to set transaction isolation level to READ UNCOMMITTED, but is doesn't work.
Here is my job source.
TestJobConfiguration.java
#Slf4j
#Configuration
public class TestJobConfiguration {
#Autowired
private JobBuilderFactory jobBuilders;
#Autowired
private CustomJobExecutionListener customJobExecutionListener;
#Autowired
private JdbcTemplate jdbcTemplate;
#Autowired
private StepBuilderFactory stepBuilders;
#Bean(name = "testJob")
public Job job() {
JobBuilder jobBuilder = jobBuilders.get("testJob").listener(customJobExecutionListener);
Step step = stepBuilders.get("testStep").tasklet(count()).transactionAttribute(transactionAttr())
.build();
return jobBuilder.start(step).build();
}
public TransactionAttribute transactionAttr() {
RuleBasedTransactionAttribute tr = new RuleBasedTransactionAttribute();
tr.setIsolationLevel(TransactionDefinition.ISOLATION_READ_UNCOMMITTED);
return tr;
}
public Tasklet count() {
return new Tasklet() {
#Override
public RepeatStatus execute(StepContribution contribution, ChunkContext context) {
StringBuilder countSql = new StringBuilder();
countSql.append(" SELECT COUNT(id)");
countSql.append(" FROM user");
log.debug("test start");
int count = jdbcTemplate.queryForObject(countSql.toString(), Integer.class);
contribution.incrementWriteCount(count);
log.debug("test end");
log.debug("count : {}", count);
return RepeatStatus.FINISHED;
}
};
}
}
I executed below sql statement in Microsoft SQL Server Management Studio, and executed TestJob.
begin tran
delete from user
I expected to complete job, but it stopped at sql execution point.
My log is below.
...
2017-08-29T12:21:23.555+09:00 DEBUG --- [ main] c.p.l.b.rank.job.TestJobConfiguration : test start
When I change my sql statement, countSql.append(" SELECT COUNT(id)"); to countSql.append(" SELECT COUNT(id) WITH (READUNCOMMITTED)"); it works.
...
2017-08-29T13:44:43.692+09:00 DEBUG --- [ main] c.p.l.b.rank.job.TestJobConfiguration : test start
2017-08-29T13:44:43.726+09:00 DEBUG --- [ main] c.p.l.b.rank.job.TestJobConfiguration : test end
2017-08-29T13:44:43.726+09:00 DEBUG --- [ main] c.p.l.b.rank.job.TestJobConfiguration : count : 15178
2017-08-29T13:44:43.747+09:00 INFO --- [ main] c.p.l.b.l.CustomJobExecutionListener :
<!-----------------------------------------------------------------
Protocol for testJob
Started : Tue Aug 29 13:44:43 KST 2017
Finished : Tue Aug 29 13:44:43 KST 2017
Exit-Code : COMPLETED
Exit-Descr. :
Status : COMPLETED
Job-Parameter:
date=2017-08-29 13:44:43 +0900
JOB process time : 0sec
----------------------------------------------------------------->
Why doesn't work isolation level of transaction attribute??