Multi-tenancy indicates an approach in software development where a single application simultaneously serves multiple clients. These clients are also called tenants. This approach is very common in Software as a Service (SaaS) solutions.

Most of the time it is OK to simply let the database do the work of concurrency control, however sometimes you can encounter an application where you need to take over. In this article I will give a brief introduction to optimistic and pessimistic concurrency control.

In this article I will give you a brief introduction to Entity auditing with Hibernate, or to be more specific with Hibernate Envers which is since some 3.x version part of the Hibernate core.

If you have a bigger application you think about performance and how you can improve it. Caching is one way to do this because it enables fewer queries going to the database. Querying the database is always a performance impact because it is an I/O operation. And I/O operations are much slower than operations using… Continue reading →

In this article I will give you a brief introduction to Hibernate batch processing.

After the introduction into Hibernate 4 which included mapping relationships and inheritance let’s dig a bit deeper and see how we can reach stored data in the database.

Last time I introduced annotations instead XML configuration. Now I will dig deeper and show how you can create entity relations and map them to the database. If you look at the Book entity in the example you might think: “Why store the authors of a book as a String?” and you are right. This… Continue reading →

In the previous articles I have shown you how to get started with Hibernate 4: create entities, manage relations and inheritance and how to query the stored data. However every time I used an in-memory database which means that every time you stop the application the inserted data vanishes.

Last time we have taken a look at mapping entity relations to the database. Now it is time to focus on the main object-orinented relation: inheritance.

In the last, introductory article I mentioned the so-called “XML-Hell” which is the massive usage of XML to do Hibernate configuration. In this article, I will introduce the annotation-based configuration, where you can use Hibernate’s annotations on the entities to reduce the amount of XML needed.