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.

9,874 thoughts on “Integration testing transactions and optimistic locking with Spring and JUnit”

  4. Bonus features are a common feature of many online slot games, including Gates of Olympus. These bonuses might give the player more chances to max win Gates of Olympus or significantly increase their earnings. Always search for opportunities to increase potential winnings, such as free spins and Ante Bet and casino promo. It’s been years since the first real Fable reveal happened, with carefully framed trailers and just the right amount of… Are you itching for some more blog post like this covering some of the more rewarding slots Spina Zonke has to offer, then have no fear because our latest blog is near. But in the meantime you need to checkout our top 10 tips to win big on Spina Zonke! Defeat the boss at the end of each challenge in order to win Time Attack Boss Battle. The overarching story that focuses on Robert trying to bring back Mecha Man, his two potential love interests of Blond Blazer and Invisigal, as well as the whole trying to keep Z-Team together, ultimately just doesn’t impress. The characters it wraps up in the story I enjoyed, but I’ve seen this style of story done before and done better. All the pieces are there for another go, I just want to see them arranged in a less predictable, less cliched manner. 
    https://www.classeur-carte-pokemon.fr/class777-casino-issues-review/
    Up against reels of precious gems and mysterious artifacts, players will face a trial to enter the heavenly kingdom. The violet sky seems temptingly just beyond the gates. Because the super scatter mechanism is not something you come across in every slot, it might take some time before you adjust to its working. The best way to familiarize yourself with the process is to sign up to play the demo version, which will help you get the hang of the slot before you have to bet any real money on it. The free-play version of Gates of Olympus Super Scatter is available on the PlayCasino website. It’s the bonus rounds that define Gates of Olympus Super Scatter, and they’re where the real volatility comes to life. Pragmatic Play has sharpened the core “pay anywhere” system from the 2021 original by introducing a new layer of Super Scatter functionality, letting players win even before the bonus round begins.

  5. Wonderful post but I was wondering if you could write a
    litte more on this subject? I’d be very grateful if
    you could elaborate a little bit further. Bless you!

    my page :: web Site

  14. Referral To identify the best slots at Dara Casino, we evaluated factors like bonus features, themes, RTP (Return to Player) rates, and volatility. If you register here today using our promo code, DEADSPIN, you can get exclusive and cumulative bonuses of up to 56 Stake Cash (SC) and 560k Gold Coins (GC), plus 5% rakeback. You can easily use this bonus to play various casino-style games at Stake.us, including table games, slots, and exclusive in-house titles. New online casinos uk real money no deposit bonus join the platform and as soon as you have your new account ready, you will receive your Refer a Friend bonus when we have received and verified their ID. Indeed, QIWI. Pulsz Casino hosts more than 1,000 slots, including jackpot slots, Hold and Win slots, video slots, and classic steppers. Hold and Win fans might be especially delighted by Pulsz, as the library houses more than 160 titles in this category.
    https://cloverhealthsolutions.ca/19/lucky-mate-casino-an-australian-review/
    Before we dive into the gameplay, let’s take a quick look at the key details of the Gates of Olympus slot. The following table provides an overview of the game’s specifications. If you do decide to play Gates of Olympus for real money, click ‘Play in a casino’. Then, you will be taken to a list of top three online casinos with games from Pragmatic Play, where you should be able to play a real-money version of Gates of Olympus. Furthermore, you are to spy and find some great wins through either the 5. However, the name of the game has a great addition to the game or its way in the paytable. After a fresh indictment was issued, which shows your typical wins with the lowest value symbols on the bottom left and most popular across the reels. Gates of Olympus is a slot from Pragmatic Play with a Greek mythology theme, focusing on the home of the gods at the top of Mount Olympus.

  22. Прочитал статью на одном дыхании — очень структурированно и без воды. Автор прошёлся по всем ключевым моментам: что такое ПФ, кому нужно, кому нет, обзор инструментов, аудит перед стартом, выбор стратегии, пошаговая инструкция, ошибки новичков и кейсы. Особенно ценно, что в конце есть выводы и рекомендации. Это полноценное руководство к действию. Рекомендую добавить в закладки всем, кто серьёзно занимается продвижением: https://partnerkin.com/tribuna/blog-vitalivivdenko/nakrutka-pf-v-yandekse-polnoe- .

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>