Unable to create #Bean of Custom Repository with #PersistenceContext in Spring Batch Tasklet? - spring

Question

I already went through the link : Can we use #Autowired in a Tasklet in Spring Batch?, but still I am facing the below issue:
All My batch jobs are xml based and looks like unable to autowired the CustMstrCustomRepository bean into the Tasklet with the #PersistentContext
ABCDataTasklet.java
#Configuration
#Data
public class ABCDataTasklet implements Tasklet {
#Autowired
private CustMstrCustomRepository custMstrCustomRepository;
#Override
public RepeatStatus execute(StepContribution contribution, ChunkContext chunkContext) throws Exception {
List<ABCCustomClass> result = custMstrCustomRepository.getData();
chunkContext.getStepContext().getStepExecution().getJobExecution().getExecutionContext()
.put("data", result);
return RepeatStatus.FINISHED;
}
}
Error
java.lang.NullPointerException: null
at com.XXX.XXX.batch.tasklet.ABCDataTasklet.execute(ABCDataTasklet.java:29) ~[classes/:na]
at org.springframework.batch.core.step.tasklet.TaskletStep$ChunkTransactionCallback.doInTransaction(TaskletStep.java:406) ~[spring-batch-core-4.0.1.RELEASE.jar:4.0.1.RELEASE]
at org.springframework.batch.core.step.tasklet.TaskletStep$ChunkTransactionCallback.doInTransaction(TaskletStep.java:330) ~[spring-batch-core-4.0.1.RELEASE.jar:4.0.1.RELEASE]
at org.springframework.transaction.support.TransactionTemplate.execute(TransactionTemplate.java:140) ~[spring-tx-5.0.8.RELEASE.jar:5.0.8.RELEASE]
at org.springframework.batch.core.step.tasklet.TaskletStep$2.doInChunkContext(TaskletStep.java:272) ~[spring-batch-core-4.0.1.RELEASE.jar:4.0.1.RELEASE]
at org.springframework.batch.core.scope.context.StepContextRepeatCallback.doInIteration(StepContextRepeatCallback.java:81) ~[spring-batch-core-4.0.1.RELEASE.jar:4.0.1.RELEASE]
at org.springframework.batch.repeat.support.RepeatTemplate.getNextResult(RepeatTemplate.java:375) ~[spring-batch-infrastructure-4.0.1.RELEASE.jar:4.0.1.RELEASE]
at org.springframework.batch.repeat.support.RepeatTemplate.executeInternal(RepeatTemplate.java:215) ~[spring-batch-infrastructure-4.0.1.RELEASE.jar:4.0.1.RELEASE]
at org.springframework.batch.repeat.support.RepeatTemplate.iterate(RepeatTemplate.java:145) ~[spring-batch-infrastructure-4.0.1.RELEASE.jar:4.0.1.RELEASE]
at org.springframework.batch.core.step.tasklet.TaskletStep.doExecute(TaskletStep.java:257) ~[spring-batch-core-4.0.1.RELEASE.jar:4.0.1.RELEASE]
at org.springframework.batch.core.step.AbstractStep.execute(AbstractStep.java:200) ~[spring-batch-core-4.0.1.RELEASE.jar:4.0.1.RELEASE]
at org.springframework.batch.core.job.SimpleStepHandler.handleStep(SimpleStepHandler.java:148) [spring-batch-core-4.0.1.RELEASE.jar:4.0.1.RELEASE]
at org.springframework.batch.core.job.flow.JobFlowExecutor.executeStep(JobFlowExecutor.java:66) [spring-batch-core-4.0.1.RELEASE.jar:4.0.1.RELEASE]
at org.springframework.batch.core.job.flow.support.state.StepState.handle(StepState.java:67) [spring-batch-core-4.0.1.RELEASE.jar:4.0.1.RELEASE]
at org.springframework.batch.core.job.flow.support.SimpleFlow.resume(SimpleFlow.java:169) [spring-batch-core-4.0.1.RELEASE.jar:4.0.1.RELEASE]
at org.springframework.batch.core.job.flow.support.SimpleFlow.start(SimpleFlow.java:144) [spring-batch-core-4.0.1.RELEASE.jar:4.0.1.RELEASE]
at org.springframework.batch.core.job.flow.FlowJob.doExecute(FlowJob.java:136) [spring-batch-core-4.0.1.RELEASE.jar:4.0.1.RELEASE]
at org.springframework.batch.core.job.AbstractJob.execute(AbstractJob.java:308) [spring-batch-core-4.0.1.RELEASE.jar:4.0.1.RELEASE]
at org.springframework.batch.core.launch.support.SimpleJobLauncher$1.run(SimpleJobLauncher.java:141) [spring-batch-core-4.0.1.RELEASE.jar:4.0.1.RELEASE]
at org.springframework.core.task.SyncTaskExecutor.execute(SyncTaskExecutor.java:50) [spring-core-5.0.8.RELEASE.jar:5.0.8.RELEASE]
at org.springframework.batch.core.launch.support.SimpleJobLauncher.run(SimpleJobLauncher.java:134) [spring-batch-core-4.0.1.RELEASE.jar:4.0.1.RELEASE]
at com.XXX.jobLauncherService.BillingBatchJobLauncher.executeBillingJob(BillingBatchJobLauncher.java:30) [classes/:na]
at com.mastercard.jpaApplication.run(jpaApplication.java:26) [classes/:na]
at org.springframework.boot.SpringApplication.callRunner(SpringApplication.java:800) [spring-boot-2.0.4.RELEASE.jar:2.0.4.RELEASE]
at org.springframework.boot.SpringApplication.callRunners(SpringApplication.java:784) [spring-boot-2.0.4.RELEASE.jar:2.0.4.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:338) [spring-boot-2.0.4.RELEASE.jar:2.0.4.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1258) [spring-boot-2.0.4.RELEASE.jar:2.0.4.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1246) [spring-boot-2.0.4.RELEASE.jar:2.0.4.RELEASE]
at com.mastercard.jpaApplication.main(jpaApplication.java:21) [classes/:na]
2018-08-11 22:33:51.756 INFO 1808 --- [ main] o.s.b.c.l.support.SimpleJobLauncher : Job: [FlowJob: [name=ABCDataBatchJob]] completed with the following parameters: [{runMode=YYYY, date=1534007031631, time=1534007031631}] and the following status: [FAILED]
2018-08-11 22:33:51.757 INFO 1808 --- [ Thread-5] s.c.a.AnnotationConfigApplicationContext : Closing org.springframework.context.annotation.AnnotationConfigApplicationContext#5bfa9431: startup date [Sat Aug 11 22:33:40 IST 2018]; root of context hierarchy
2018-08-11 22:33:51.758 INFO 1808 --- [ Thread-5] o.s.j.e.a.AnnotationMBeanExporter : Unregistering JMX-exposed beans on shutdown
2018-08-11 22:33:51.759 INFO 1808 --- [ Thread-5] o.s.j.e.a.AnnotationMBeanExporter : Unregistering JMX-exposed beans
2018-08-11 22:33:51.762 INFO 1808 --- [ Thread-5] j.LocalContainerEntityManagerFactoryBean : Closing JPA EntityManagerFactory for persistence unit 'devcloud'
2018-08-11 22:33:51.763 INFO 1808 --- [ Thread-5] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Shutdown initiated...
2018-08-11 22:33:53.923 INFO 1808 --- [ Thread-5] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Shutdown completed.
CustMstrCustomRepositoryImpl.java
#Service
#Transactional(readOnly = true)
public class CustMstrCustomRepositoryImpl implements CustMstrCustomRepository {
private static final String SQL = "COMPLEX SQL QUERY";
#PersistenceContext
#Qualifier(value = "entityManagerFactory")
private EntityManager entityManager;
#SuppressWarnings("unchecked")
#Override
public List<ABCCustomClass> getData() {
Query q = entityManager.createNativeQuery(SQL);
q.setParameter("actv_sw", "Y");
List<Object[]> resultList = q.getResultList();
List<ABCCustomClass> results = new ArrayList<>();
for (Object[] objects : resultList) {
results.add(ABCCustomClass.builder()
.YY((BigDecimal) objects[0])
.YY((BigDecimal) objects[1])
.YY((Date) objects[2])
.YY((Date) objects[3])
.YY((String) objects[4]).build());
}
return results;
}
}

Answer 1

Can you confirm if the custom repository is defined under a package that is scanned for Bean creation?
Generally this is a configuration given as part of the Application.java
As far as I remember an issue with autowire giving back a null could be because spring was unable to scan the class.

Answer 2

I was able to solved this issue by using #PostContruct annotation and added below logic in #Configuration class.
Now using this way, I can pass the #EntityManager easily now
#Configuration
#ComponentScan("com.XXXX")
#EnableBatchProcessing
#PropertySource("classpath:database.properties")
#ImportResource({ "classpath:jobs/XY.xml"})
#EnableJpaRepositories(basePackages = {"com.XX.repository"})
public class MyConfig {
private PlatformTransactionManager transactionManager;
#PostConstruct
void initialize() throws Exception {
if (this.transactionManager == null) {
this.transactionManager = new ResourcelessTransactionManager();
}
}
}