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Tip: How to Use JPA, @MappedSuperclass

Learn about how to define an abstract class, annotate it and extend the user class for each entity.


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First, define an abstract class and annotate it with @MappedSuperclass. This is not an entity:

@MappedSuperclass
public abstract class User implements Serializable {
   ...
}

Second, each entity should extend the User class. For example, Student and Teacher entitites:

@Entity
public class Student extends User implements Serializable {
   ...
}

@Entity
public class Teacher extends User implements Serializable {
   ...
}

 

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Octavia Andreea Anghel is a senior PHP developer currently working as a primary trainer for programming teams that participate at national and international software-development contests. She consults on developing educational projects at a national level. She is a coauthor of the book "XML Technologies--XML in Java" (Albastra, ISBN 978-973-650-210-1), for which she wrote the XML portions. In addition to PHP and XML, she's interested in software architecture, web services, UML, and high-performance unit tests.
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