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Getting Started with Oracle WebLogic Server 12c: Developer's Guide

You're reading from   Getting Started with Oracle WebLogic Server 12c: Developer's Guide If you've dipped a toe into Java EE development and would now like to dive right in, this is the book for you. Introduces the key components of WebLogic Server and all that's great about Java EE 6.

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Product type Paperback
Published in Sep 2013
Publisher Packt
ISBN-13 9781849686969
Length 374 pages
Edition 1st Edition
Languages
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Table of Contents (18) Chapters Close

Getting Started with Oracle WebLogic Server 12c: Developer's Guide
Credits
About the Authors
About the Reviewers
www.PacktPub.com
Preface
1. Overview of WebLogic Server 12c and Related Technologies FREE CHAPTER 2. Setting Up the Environment 3. Java EE Basics – Persistence, Query, and Presentation 4. Creating RESTful Services with JAX-RS 5. Singleton Bean, Validations, and SOAP Web Services 6. Using Events, Interceptors, and Logging Services 7. Remote Access with JMS 8. Adding Security 9. Servlets, Composite Components, and WebSockets 10. Scaling Up the Application 11. Some WebLogic Internals Index

Exposing RESTful Services through JAX-RS


At this point we need to create a Stateless Session Bean (EJB) that will query exhibition data through the JPA entities and return such information. Before getting into it, let's take a quick look at the types of beans supported by Java EE 6 and their definitions:

  • Stateless: This is the same definition we find for EJB 2.x—components that aren't supposed to keep information between calls. The container keeps a bean pool, and any bean instance can serve an incoming request, being very lightweight to keep and having good scalability due to its ability to serve multiple clients.

  • Stateful: When multiple interactions between system and user is needed, this kind of bean keeps consistent state through the conversation. As it holds data from a specific user, more instances have to be created to serve more users. Under heavy loads, it can degrade performance.

  • Message-driven: The focus of this kind of bean is asynchronous processing—instead of calling its methods...

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