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Tip: How to Define an Auto-incremented Identifier via JPA Annotations

See how to define an auto-incremented identifier in an entity in Java.


For defining an auto-incremented identifier in an entity, we need the @Id annotation and the IDENTITY generator as follows:

public class User implements Serializable {

    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;


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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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