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.

13,035 thoughts on “Integration testing transactions and optimistic locking with Spring and JUnit”

  4. Its such as you read my thoughts! You seem to
    understand so much about this, such as you wrote the book in it or something.
    I feel that you simply could do with a few % to drive the message house a bit, but instead
    of that, that is magnificent blog. An excellent read.

    I will certainly be back.

  12. در پایان کار

    برای دوست‌داران

    بازی انفجار آنلاین

    وقت صرف می‌کنن

    این سایت خوب

    می‌تونه واقعاً

    به درد بخوره

    نکته قابل توجه اینه که

    پلتفرم‌هایی مثل

    سایت enfejaronline

    و

    ѕib-bet

    تونستن کاربرا جذب کنن

    خلاصه اینکه

    تجربه مثبتی داشتم

    و

    به زودی

    استفاده دوباره میکنم

    Haᴠe a look at my website: قیمت طلا, Marshall,

  32. Great items from you, man. I have have in mind your stuff previous to and you
    are just too fantastic. I really like what you’ve received right
    here, certainly like what you are stating and the way in which
    in which you are saying it. You make it entertaining and you still take care of to stay it wise.

    I can not wait to learn much more from you. That is really a
    tremendous website.

  33. Having read this I believed it was rather enlightening.

    I appreciate you spending some time and energy
    to put this information together. I once again find myself spending a significant
    amount of time both reading and posting comments. But so what, it was still
    worth it!

  35. Fantastic goods from you, man. I have understand your stuff previous to and you’re
    just extremely fantastic. I actually like
    what you have acquired here, certainly like
    what you are saying and the way in which you say it. You make
    it entertaining and you still take care of to keep it
    wise. I cant wait to read far more from you. This is really
    a tremendous web site.

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>