@Async annotation in SpringBoot not saving Data to DB

I have a scenario in my project where I need to develop a asynchronous service which will perform some DB update operation from Spring Boot.I am aware that @Async always spawn a new thread.So,I am taking following actions:

I have created two separate Service classes.

First Service class [say Service Class A]

@Async
@Override
public Future<MyResponseModel> myMethodForApproval(parameterList) {
    MyResponseModel myResponseModel= new MyResponseModel();
    serviceClassB.performApproval(parameterList); 
    myResponseModel.setStatus("Success");
    myResponseModel.setMessage("Approval process initiated successfully");
    return new AsyncResult<MyResponseModel>(myResponseModel);
}

In Second service class [Say Service Class B, actual business logic is written]

@Transactional(readOnly = false, propagation = REQUIRES_NEW, rollbackFor = { Throwable.class })
public void performApproval(parameterList) {
  //all the business logic checking.
  repoLayer.saveAll(myEntities);

}

In controller Layer:

@RequestMapping(value = "/approveProcess", method = RequestMethod.POST, consumes = { "application/json" })
public ResponseEntity<MyResponseModel> approveProcess(@RequestBody parameterList) {
    serviceClassA.myMethodForApproval(parameterList);
}

Now exception I am getting

org.springframework.dao.InvalidDataAccessApiUsageException: no transaction is in progress; nested exception is javax.persistence.TransactionRequiredException: no transaction is in progress