Based on its javadoc, a java.util.List is supposed to represent an ordered collection of values. But that’s not necessarily the case if you use it as the type of a to-many association or an ElementCollection. As I explained before, Hibernate can handle a java.util.List as a Bag or a List. Only the List mapping persists the order…
Embeddables are simple Java objects. They provide an easy way to define and group a set of attributes that become part of your entity. Developers often use them to create reusable mapping information and handle them using the same piece of business code. Unfortunately, the JPA specification and Hibernate until version 6.0.0, required your embeddable…
JPA and Hibernate provide a default mapping that maps each entity class to a database table with the same name. Each of its attributes gets mapped to a column with the same. But what if you want to change this default, e.g., because it doesn’t match your company’s naming conventions? You can, of course, specify…
Inheritance is one of the key concepts of all object-oriented programming languages. And Java makes there no difference. All developers are familiar with this concept and expect to use it in all parts of their code. That, of course, also includes the persistence layer and the entity model. But the concept of inheritance doesn’t exist…
Lombok is a popular framework among Java developers because it generates repetitive boilerplate code like getter and setter methods, equals and hashCode methods, and the default constructor. All you need to do is add a few annotations to your class and Lombok will add the required code at compile time. This works reasonably well for…