Integration testing transactions and optimistic locking with Spring and JUnit

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.

13,056 thoughts on “Integration testing transactions and optimistic locking with Spring and JUnit

  1. Статья про SEO как искусство и науку успеха. Автор разбирает ключевые компоненты продвижения и объясняет, почему это важно для бизнеса. Полезно для общего понимания: https://sushibb.ru/2026/01/30/seo-prodvizhenie-sajta-iskusstvo-i-nauka-uspeha-v-cifrovom-mire/

  2. Since the admin of this web page is working, no
    doubt very shortly it will be renowned, due to its quality contents.

    my webpage casino sites with mobile payment (Julianne)

  3. no deposit bingo bonus usa, no deposit bonus codes online pokies
    canada and free spins no deposit keep your winnings
    uk, or free spins casino no deposit bonus united states

    My web-site – ante up gambling (Jesenia)

  4. united kingdom live casino, new casino coming to biloxi, Janell, usa gambling sites and paypal bingo
    sites uk, or online gambling united states banned

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>