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.

14,370 thoughts on “Integration testing transactions and optimistic locking with Spring and JUnit”

  7. Beyler bahis severler Artık güvenilir bir bahis sitesi bulmak imkânsız gibi Hepsinde dolandırıldım Bu site gerçekten işe yarıyor — 1xbet güncel giriş burada Çekim işlemleri dakikalar içinde Kısacası her şey detaylı — 1xbet güncel giriş 1xbet güncel giriş Sakın sahte sitelere kanma Bahis yapan herkese yolla

  12. Bahisçiler dikkat Her yer dolandırıcı dolu Neredeyse bahsi bırakıyordum En sağlam platform bu — 1xbet hızlı para çekme Canlı destek anında yanıtlıyor Neyse kaybetmemek için tıklayın — 1xbet üye ol 1xbet üye ol Sakın sahte sitelere kanma Bunun gibilerin derdine düşenlere gönder

  13. Selam millet Bazıları maç sırasında çöküyor Paramı geri alamadım Ama sonunda sağlam bir site buldum — bahis siteler 1xbet kesinlikle bir numara Müşteri hizmetleri 7/24 aktif Kısacası tüm bilgiler bu linkte — one x bet one x bet Sakın sahte sitelere kanmayın İhtiyacı olan herkese gönderin

  20. Vavada casino bonus sezonalitate (svetki, sporta eventi) maina dasnibu. Sekojiet kalendaram. Hub droso saiti agapesalonspa.org. Off-season mazaks. VIP stabilaks. Kazino Vavada plano casino bonus sezonas ieprieks.

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>