no transaction is in progress

[babaiwan]

it occured to me that " no transaction is in progress"

springBootVersion = "2.1.14.RELEASE"
hibernateVersion = "5.3.17.Final"

the solution is the annoation

    @Transactional(readOnly = true, propagation= Propagation.NOT_SUPPORTED) 
    @RequestMapping(value = "/blobs", method = RequestMethod.POST, consumes = MediaType.MULTIPART_FORM_DATA_VALUE)
    public ResponseEntity store(@RequestPart("inExcelFile") MultipartFile multipartFile) throws IOException, URISyntaxException {
        log.info("Persisting new file: {}", multipartFile.getOriginalFilename());
        EmailAuditPo emailAuditPo = new EmailAuditPo(multipartFile.getOriginalFilename(),
                lobHelper.createBlob(multipartFile.getInputStream(), multipartFile.getSize()));

        emailAuditPo = emailAuditDao.save(emailAuditPo);

        log.info("Persisted {} with id: {}", multipartFile.getOriginalFilename(), emailAuditPo.getId());
        return ResponseEntity.created(new URI("http://localhost:8080/blobs/" + emailAuditPo.getId())).build();
    }

why it happens
https://stackoverflow.com/questions/41559793/hibernate-5-2-and-spring-4-3-non-jpa-javax-persistence-transactionrequiredexc

spring-projects/spring-framework#18936