HibernateCursorItemReader不工作的Spring Boot批处理

Question

知道为什么下面的代码会出现以下错误吗？

@Bean
@StepScope
public ItemReader<OrderDetail> reader(@Value("#{jobParameters['orderDate']}") final String orderDate)
        throws UnexpectedInputException, ParseException, Exception {
    LOGGER.info("START of reader() with args: ", orderDate);

    final Date beginDate = new Date();
    final Date endDate = new Date();
    final Map<String, Object> parameterValues = new HashMap<>();
    parameterValues.put("beginDate", beginDate);
    parameterValues.put("endDate", endDate);

    final HibernateCursorItemReader<OrderDetail> itemReader = new HibernateCursorItemReader<>();
    itemReader.setQueryString("select dtl from OrderDetail dtl join OrderSummary sumy on dtl.orderId = sumy.id where orderDate between
        :beginDate and :endDate order by id desc");
    itemReader.setParameterValues(parameterValues);
    itemReader.setSessionFactory(sessionFactory);
    itemReader.setUseStatelessSession(true);
    itemReader.afterPropertiesSet();

    LOGGER.info("END of reader()");

    return itemReader;
}

java.lang.NullPointerException：org.springframework.batch.item.database.HibernateCursoritemReader.DoRead处为null（HibernateCursoritemReader.java:155）

Answer 1

返回HibernateCursorItemReader而不是ItemReaderStepScope需要特定的实现类型。