ByThorben JanssenYou probably learned that you should use FetchType.LAZY for all of your associations. It ensures that Hibernate initializes an association when you use it and doesn’t spend any time getting data you don’t need. Unfortunately, this introduces a new issue. You now need to use a JOIN FETCH clause or an EntityGraph to fetch the…
ByThorben JanssenEntityGraphs and JOIN FETCH clauses provide an easy and efficient way to fetch an entity and initialize its associations. But if you try to use it with a domain model that uses inheritance, you will quickly run into an issue: You can’t use this approach in a polymorphic query to fetch an association that’s defined…
ByThorben JanssenThe 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…
ByThorben JanssenHibernate provides lots of mapping features that allow you to map complex domain and table models. But the availability of these features doesn’t mean that you should use them in all of your applications. Some of them might be a great fit for smaller applications that are only used by a few users in parallel….
ByThorben JanssenUsing JPA and Hibernate, you can choose between various ways to query your data, and each of them supports one or more kinds of projections. That provides you with lots of options to implement your persistence layer. But which one fits your use case? And which one should you avoid if you want to optimize…