Integration testing transactions and optimistic locking with Spring and JUnit

Posted on by

I did some badness today.

I wanted an integration test to check to see if my @Transactional method actually did rollback on an optimistic lock failure. It’s a pretty business critical method so I wanted to be sure that the whole @Transactional and @Version annotation voodoo actually works.

The approach I took was to inject, what I called a “slowRepository” into the object with the @Transactional method. The slowRepository is just a mockito mock of the object which “answers” (using “thenAnswer”) to the “findBy…” with some custom code.

The idea is that at some point during the @Transactional method the slowRepository is called and the “answer” code is invoked. In the test, the answer code follows along the lines of:

1. Grab the data it requires from the (not slow) repository (the repository the slowRepository is mocking)
2. Switch back the slowRepository for the not slow repository
3. Invoke the @Transactional method again on a separate thread
4. Sleep for a bit
5. Wake up and return the data from step 1

The @Transactional call on the separate thread completes and commits before slowRepository wakes up. When it does, slowRepository returns stale data and the @Transactional method then fails accordingly.

The problem I encountered was using the setters for my @Autowired dependencies on the bean with the @Transactional method. I needed to use the setters so that I could switch in and out the slowRepository, but couldn’t because Spring AOP proxies are implementations of an interface, not subclasses (by default – yes I realise you can get Spring to proxy the target class using CGLIB). I found this blog post which explains how to get at the target object behind a Spring proxy. I converted it to Scala:

…which is pretty ninja.

14,497 thoughts on “Integration testing transactions and optimistic locking with Spring and JUnit”

  6. Vavada раздаёт фриспины без депозита избранным категориям игроков. Депозитные бонусы суммируются с фриспинами за регистрацию. Воспользуйтесь vavada бонус при пополнении счёта для максимальной выгоды. Новые комбинации публикуются в рассылке и соцсетях бренда. Играйте ответственно и используйте бонусы с умом.

  23. Merhaba arkadaşlar Siteler sürekli kapanıyor yeni adres arıyorum Uzun zamandır araştırıyorum Ama sonunda bu siteyi keşfettim — 1xbet güncel adres tıkla Her gün yeni bonus ve promolar var Kısacası tüm detaylar linkte — 1xbet yeni giriş adresi 1xbet yeni giriş adresi Tek adres 1xbet güncel giriş Bahis yapan herkese gönder

  27. Millet dinleyin Mobil bahis apk dosyasını yüklemek çok kolay Onlarca site denedim Hiç sorun yaşamadım — 1xbet apk indir ücretsiz Canlı maçlar anında açılıyor Neyse kaybetmeyin diye tıkla — 1xbet indir apk 1xbet indir apk Tek adres 1xbet apk yukle Bahis yapan herkese gönder

  28. Всем привет из Кыргызстана То выплаты задерживают Искал долго перепробовал кучу вариантов Короче работает стабильно и честно — букмекерская контора с высокими коэффициентами Поддержка отвечает сразу В общем сохраняйте себе — мостбет мостбет Не ведитесь на лохотроны Перешлите тому кто тоже ищет нормальную контору

  45. Selam millet Ödemeler aylarca sürüyor canlı destek yok Onlarca site denedim Sonunda bu siteyi keşfettim — 1xbet giriş yap hemen Canlı destek gece gündüz aktif Neyse kaybetmeyin diye tıkla — 1xbetgiriş 1xbetgiriş Tek adres 1xbet güncel giriş Bahis yapan herkese gönder

Leave a Reply

Your email address will not be published. Required fields are marked *

You may use these HTML tags and attributes: <a href="" title=""> <abbr title=""> <acronym title=""> <b> <blockquote cite=""> <cite> <code> <del datetime=""> <em> <i> <q cite=""> <strike> <strong>