Spring Boot and Spring Data JPA make the handling of transactions extremely simple. They enable you to declare your preferred transaction handling and provide seamless integration with Hibernate and JPA. The only thing you need to do is to annotate one of your methods with @Transactional. But what does that actually do? Which method(s) should…
The LazyInitializationException is one of the most common exceptions when working with Hibernate. There are a few easy ways to fix it. But unfortunately, you can also find lots of bad advice online. The proclaimed fixes often replace the exception with a hidden problem that will cause trouble in production. Some of them introduce performance…
For quite some time, finding the right scope of a microservice was proclaimed to solve all problems. If you do it right, implementing your service is supposed to be easy, your services are independent of each other, and you don’t need to worry about any communication between your services. Unfortunately, reality didn’t hold up to…
Since I started talking about microservices and the challenges that you have to solve whenever you want to exchange data between your services, I hear 3 things: You only need to model the scope of your services “the right way” to avoid these problems. We use multiple local transactions, and everything works fine. It’s really…
Choosing the right projection when selecting data with JPA and Hibernate is incredibly important. When I’m working with a coaching client to improve the performance of their application, we always work on slow queries. At least 80% of them can be tremendously improved by either adjusting the projection or by using the correct FetchType. Unfortunately,…