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.

15,325 thoughts on “Integration testing transactions and optimistic locking with Spring and JUnit”

  6. 888 poker deposit united kingdom, bet365 united statesn roulette tips and does united
    states have casinos, or free united statesn slot machine games

    Check out my blog – blackjack professional strategy (Cedric)

  8. Dive into the depths of excitement with Big Bass Bonanza, a thrilling 5X3 video slot game spread across 10 paylines, where big wins are just a cast away. Here, the Fisherman is your best friend, the key player who has the unique ability to reel in more Fish symbols or gather them all in one go. As you go through the Free Spins, watch as the Fisherman not only boosts your wins by increasing multipliers up to an astonishing 10x but also potentially unlocks the explosive Dynamite Feature. This special addition has the power to instantly turn random symbols into Fish symbols, amplifying your chances of a bountiful catch. So, get ready to cast your line and fish for the biggest wins beneath the waves in Big Bass Bonanza! Get lucky as you reel in Big Bass with retriggers & multipliers in play. This animated video slots from Pragmatic Play is beautifully crafted with bubbly reels, fishing-themed symbols, and generous rewards. A 5×3 video slot, Big Bass Bonanza features ten paylines of underwater treasures. This top slot is great for first-time fishermen and experienced players, bringing the best of Free Spins Wins and Multipliers to your screen.
    https://doc.projectsegfau.lt/s/lXe1k3RDGu
    BENZ & SPEEN Bigger Bass Bonanza, developed by Pragmatic Play, is the upgraded and more premium version of the classic slot game Big Bass Bonanza. With higher betting options, it’s designed to cater to high rollers looking for big prizes and a more engaging fishing-themed experience in online casinos. You can play Bigger Bass Bonanza on any mobile device on MrQ. Sign up today and play over 900 real money slots and casino games. As the name suggests, this slot is bigger and better than its predecessor. It doubles the winning potential and adds 2 extra paylines as well as bigger fish to fry on the reels. The Bigger Bass Bonanza slot also looks better while retaining the features of the original. Big Bass Bonanza has secured its place in the UK casino market through a balanced combination of engaging gameplay, rewarding features, and trustworthy platforms. Whether you are fishing for fun or aiming for real money wins, this Pragmatic Play slot delivers excitement and the potential for sizable payouts. Make sure to play at a credible UK casino site and don’t forget to try the free demo first to familiarize yourself before betting real funds. Cast your line and good luck!

  9. Low-paying symbols are represented by card icons (10–A), with lower multipliers but frequent hits. The wild fisherman only appears during free spins, helping collect money symbols across the reels. This setup makes Big Bass Bonanza UK suitable for players who prefer simple payout logic with a few bonus twists. Connect with us Free professional educational courses for online casino employees aimed at industry best practices, improving player experience, and fair approach to gambling. You can email the site owner to let them know you were blocked. Please include what you were doing when this page came up and the Cloudflare Ray ID found at the bottom of this page. All our slot games require real money wagers, so you can’t play Big Bass Bonanza as a demo game, unfortunately. However, new players can take advantage of our welcome offer. Get 30 free spins to kick things off when you make a minimum deposit of £10.
    https://www.techzon.cz/tote-promo-code-uk-app-unlock-exclusive-bonuses-for-uk-casino-players/
    Big Bass Bonanza features a symbols designed around its fishing theme. Each symbol has a specific payout value, which depends on the number of symbols matched on a payline. Our web site provides UK players with access to the full paytable, helping you plan your gameplay efficiently. You use . Update your browser now for free. Bigger Bass Bonanza sets sail for a flashier harbor, hauling in even bigger wins. This sequel cranks up the excitement with a boosted max win potential and a couple of extra payout lines. While the familiar fishing theme remains, there is a visual upgrade with a vibrant harbor scene instead of the original’s underwater world. The Big Bass Bonanza slot series dives deeper with Big Bass Bonanza Megaways. While the core theme remains the same, this version gets a revamped Megaways makeover. The slot takes place across 6 reels and introduces an extra 4 symbol reel allowing for a whopping 46,656 ways to win and up to 4,000x bet.

  24. Слушайте кто знает Муж просто потерял себя Родственники не знают что делать В больницу тащить страшно Короче врач приехал и поставил систему — нарколог на дом срочно Дал рекомендации и успокоил семью В общем телефон и цены тут — нарколога домой https://alkogolizm.narkolog-na-dom-voronezh-10.ru Не ждите пока станет хуже Перешлите тем кто в такой же ситуации

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>