Question

More specificly, how do I save a list of type class with Hibernate?

I have the following (simplefied) class:

@Entity
@Table(name = "bundles")
public class Bundle{

    @Id
    private Long id;

    private List<Class<?>> classes;

    // Getters & Setters and some logic
}

Now, how do I go about saving this in a database? I need a database schema wich provides an option to save a “class” type, but I can’t figure it out. I use PostgreSQL as a database.

The fact that it is a List would not really matter, I would just annotate it with @OneToMany.

Answer 1

According to the documentation, Class<?> is correctly handled by hibernate:

6.1.1.20. java.lang.Class

org.hibernate.type.ClassType
Maps a java.lang.Class to a JDBC VARCHAR (using the Class name)

Registered under class and java.lang.Class in the type registry (see Section 6.5, “Type registry”).

The database “column” needs to be VARCHAR