4 Building and Using Application Services

This chapter describes how to develop the EJB service portion of an application using JPA (EJB 3.0) entities to persist data, an EJB session bean to implement a session facade, and how to expose the functionality as a web service and an ADF Data Control.

Note: The application services described here are used in the Customer Service application in the SOA Order Booking sample application. Architects and developers are not confined to using this technology stack and should not feel limited to this choice for their own applications.

This chapter includes the following sections:

• Section 4.1, "Introduction to Business Services"

• Section 4.2, "Creating JPA Entities that Map to Database Tables"

• Section 4.3, "Configuring Persistence Units"

• Section 4.4, "Implementing Services with EJB Session Beans"

• Section 4.5, "Accessing Entities from a Session Bean"

• Section 4.6, "Exposing a Session Bean as a Web Service"

• Section 4.7, "Exposing Services with ADF Data Controls"

• Section 4.8, "Testing EJBs"

• Section 4.9, "Deploying EJB Applications"