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Developing Middleware in Java EE 8

You're reading from   Developing Middleware in Java EE 8 Build robust middleware solutions using the latest technologies and trends

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Product type Paperback
Published in Jun 2018
Publisher Packt
ISBN-13 9781788391078
Length 252 pages
Edition 1st Edition
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Author (1):
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Abdalla Mahmoud Abdalla Mahmoud
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Abdalla Mahmoud
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Table of Contents (12) Chapters Close

Preface 1. Delving into Java EE 8 FREE CHAPTER 2. Dependency Injection Using CDI 2.0 3. Accessing the Database with JPA 2.1 4. Validating Data with Bean Validation 2.0 5. Exposing Web Services with JAX-RS 2.1 6. Manipulating JSON with JSON-B 1.0 7. Communicating with Different Systems with JMS 2.0 8. Sending Mails with JavaMail 1.6 9. Securing an Application with Java Security 1.0 10. Making Interactive Applications with WebSockets 1.1 11. Other Books You May Enjoy

Entities

An entity is a domain object that represents a business entity, and correspondingly, a record in a database table. An entity class should satisfy the following requirements:

  • The class must be annotated with the javax.persistence.Entity annotation.
  • The class must have a public or protected no-argument constructor. The class may have other constructors.
  • The class must not be declared final. No methods or persistent instance variables may be declared final.
  • If an entity instance is passed by value as a detached object, such as through a session bean's remote business interface, the class must implement the Serializable interface.
  • Entities may extend both entity and non-entity classes, and non-entity classes may extend entity classes.
  • Persistent instance variables must be declared private, protected, or package-private and can be accessed directly only by the entity...
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