How do you denote a class as an entity for ORM systems like Hibernate in Java?

In Java, to designate a class as an entity that will be used by an ORM system (such as Hibernate), the @Entity annotation from the javax.persistence package is used.

This annotation informs the ORM that this class corresponds to a table in the database, and its instances are records in that table.

Example:

import javax.persistence.Entity;
import javax.persistence.Id;

@Entity
public class User {
    @Id
    private Long id;
    private String name;

    // getters and setters
}

Besides @Entity, annotations like @Table are often used to specify the table name, @Id to denote the primary key, as well as other annotations for configuring columns and relationships.