Book Image

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

Book Image

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

Overview of this book

Oracle WebLogic server has long been the most important, and most innovative, application server on the market. The updates in the 12c release have seen changes to the Java EE runtime and JDK version, providing developers and administrators more powerful and feature-packed functionalities. Getting Started with Oracle WebLogic Server 12c: Developer's Guide provides a practical, hands-on, introduction to the application server, helping beginners and intermediate users alike get up to speed with Java EE development, using the Oracle application server. Starting with an overview of the new features of JDK 7 and Java EE 6, Getting Started with Oracle WebLogic Server 12c quickly moves on to showing you how to set up a WebLogic development environment, by creating a domain and setting it up to deploy the application. Once set up, we then explain how to use the key components of WebLogic Server, showing you how to apply them using a sample application that is continually developed throughout the chapters. On the way, we'll also be exploring Java EE 6 features such as context injection, persistence layer and transactions. After the application has been built, you will then learn how to tune its performance with some expert WebLogic Server tips.
Table of Contents (18 chapters)
Getting Started with Oracle WebLogic Server 12c: Developer's Guide
Credits
About the Authors
About the Reviewers
www.PacktPub.com
Preface
Index

Configuring thread limits for MDBs


When using WebLogic's JMS system, there's a rather long list of parameters that are specific to this application server and control several aspects of our components, such as caching, security, and thread usage.

Some of these elements can be attached to a bean with annotations, some can only be declared inside a specific descriptor file, and some are available both ways. The following is a list of WebLogic-specific elements that you can apply to a bean only through a descriptor file, weblogic-ejb-jar.xml:

  • dispatch-policy: This element attaches the MDB to a work manager, which is a way to share computational resources among WebLogic components.

  • initial-beans-in-free-pool: This element tells the bean system how many beans should be created and put in the pool when the application is started. When WebLogic creates a message-driven bean, 16 instances are created. These can be seen in the Consumers Current column on the administration's queue monitoring screen...