Java Spring批处理JpaPagingItemReader在测试中没有EntityManager（NPE）
我有一个使用Java Spring批处理JpaPagingItemReader在测试中没有EntityManager（NPE）,java,jpa,spring-batch,h2,Java,Jpa,Spring Batch,H2,我有一个使用JpaPagingItemReader的小型Spring批处理作业。当我从命令行启动时，该作业运行良好，但当我想测试@StepScope组件JpaPagingItemReader时，我会得到一个NullPointerException。我不明白为什么工作很好，但我不能测试它根据文件 我只有一个简单的Employee类，带有基本JPA注释 以下是我的作业配置类： @Slf4j @Configuration @EnableBatchProcessing public class PayS
JpaPagingItemReader@StepScopeJpaPagingItemReaderNullPointerExceptionEmployeeJPA@Slf4j
@Configuration
@EnableBatchProcessing
public class PaySalaryJobConfiguration {
private final JobBuilderFactory jobBuilderFactory;
private final StepBuilderFactory stepBuilderFactory;
@Autowired
public PaySalaryJobConfiguration(
JobBuilderFactory jobBuilderFactory,
StepBuilderFactory stepBuilderFactory
) {
this.jobBuilderFactory = jobBuilderFactory;
this.stepBuilderFactory = stepBuilderFactory;
}
@Bean
@StepScope
public ItemProcessor<Employee, Employee> employeeProcessor() {
return item -> {
log.info("Process item: {}", item);
return item;
};
}
@Bean
@StepScope
public JpaPagingItemReader<Employee> someoneReader(
EntityManagerFactory entityManagerFactory
) {
return new JpaPagingItemReaderBuilder<Employee>()
.name("someone-reader")
.entityManagerFactory(entityManagerFactory)
.queryString("Select e from Employee e order by e.id asc")
.pageSize(1)
.build();
}
@Bean
@StepScope
public FlatFileItemWriter<Employee> csvWriter(
@Value("#{jobParameters['output.path.csv']}") String outputPath
) {
DelimitedLineAggregator<Employee> lineAggregator = new DelimitedLineAggregator<>();
lineAggregator.setDelimiter(",");
BeanWrapperFieldExtractor<Employee> fieldExtractor = new BeanWrapperFieldExtractor<>();
fieldExtractor.setNames(new String[]{"id", "firstName", "lastName", "salary"});
lineAggregator.setFieldExtractor(fieldExtractor);
return new FlatFileItemWriterBuilder<Employee>()
.name("csv-salary-writer")
.resource(new FileSystemResource(outputPath))
.lineAggregator(lineAggregator)
.encoding("UTF-8")
.build();
}
@Bean
public Step writeSalarySlipToCsv (
JpaPagingItemReader<Employee> someoneReader,
FlatFileItemWriter<Employee> csvWriter
) {
return stepBuilderFactory
.get("retrieve-salary-slip-step")
.<Employee, Employee>chunk(1)
.reader(someoneReader)
.processor(employeeProcessor())
.writer(csvWriter)
.stream(someoneReader)
.build();
}
@Bean
public Job paySalaryJob(
Step writeSalarySlipToCsv
) {
return jobBuilderFactory
.get("pay-salary-job")
.incrementer(new RunIdIncrementer())
.start(writeSalarySlipToCsv)
.build();
}
}
我使用的是h2数据库，在启动时用import.sql和schema-h2.sql脚本提供的数据填充数据库。我正在使用Spring Boot 2.0.5.RELEASE和Spring Batch Core 4.1.2.RELEASE 根据马哈茂德·本·哈辛（Mahmoud Ben Hassine）在评论中的建议，我已将我的考试课程改为：
@Slf4j
//@SpringBootTest
@SpringBatchTest
@RunWith(SpringRunner.class)
@EnableAutoConfiguration
@ContextConfiguration(classes = {
PaySalaryJobConfiguration.class
})
@ActiveProfiles("test")
public class StepScopeIntegrationTest {
@Autowired
private JpaPagingItemReader<Employee> someoneReader;
@Autowired
private JdbcTemplate jdbcTemplate;
private StepExecution stepExecution;
@Before
public void setUp() {
log.info("Before execution we have {} entries", jdbcTemplate.queryForObject("SELECT COUNT(*) FROM EMPLOYEE", Integer.class ));
}
public StepExecution getStepExecution() {
log.info("Step Execution !");
stepExecution = MetaDataInstanceFactory.createStepExecution();
log.info("Context = {} / Step = {} ", stepExecution.getExecutionContext(), stepExecution.getStepName());
return stepExecution;
}
@Test
public void testReader() throws Exception {
log.info("Page = {}", someoneReader.getPage());
log.info("PageSize = {}", someoneReader.getPageSize());
someoneReader.open(stepExecution.getExecutionContext());
Assert.assertNotNull(someoneReader.read());
}
}
@Override
@SuppressWarnings("unchecked")
protected void doReadPage() {
EntityTransaction tx = null;
if (transacted) {
tx = entityManager.getTransaction(); // EntityManager is null...
tx.begin();
entityManager.flush();
entityManager.clear();
}//end if
@Slf4j
//@SpringBootTest
@SpringBatchTest
@RunWith(SpringRunner.class)
@EnableAutoConfiguration
@ContextConfiguration(classes = {
PaySalaryJobConfiguration.class
})
@ActiveProfiles("test")
public class StepScopeIntegrationTest {
@Autowired
private JpaPagingItemReader<Employee> someoneReader;
@Autowired
private JdbcTemplate jdbcTemplate;
private StepExecution stepExecution;
@Before
public void setUp() {
log.info("Before execution we have {} entries", jdbcTemplate.queryForObject("SELECT COUNT(*) FROM EMPLOYEE", Integer.class ));
}
public StepExecution getStepExecution() {
log.info("Step Execution !");
stepExecution = MetaDataInstanceFactory.createStepExecution();
log.info("Context = {} / Step = {} ", stepExecution.getExecutionContext(), stepExecution.getStepName());
return stepExecution;
}
@Test
public void testReader() throws Exception {
log.info("Page = {}", someoneReader.getPage());
log.info("PageSize = {}", someoneReader.getPageSize());
someoneReader.open(stepExecution.getExecutionContext());
Assert.assertNotNull(someoneReader.read());
}
}