Java - J2EE - Web Services Implementation

About

Java Web services are implemented according to the JSR 109: Implementing Enterprise Web Services specification, which defines the standard Java EE runtime architecture for implementing Web services in Java (JWS).

The JSR 109 describes that a Java EE Web service is implemented by one of the following components:

• A Java class running in the Web container.
• A stateless session EJB running in the EJB container.

The code in the Java class or EJB implements the business logic of your Web service.

Articles Related

How to create a Web Service

Methods

Web services can be created using two methods:

• top-down development from a WSDL file.
• and bottom-up development from a Java bean or enterprise bean.

Bottom-Up

Java - Java Web Service (JWS) (Annotation Method)

Java API

Standards-based Java API for coding, assembling, and deploying Java Web services:

• Java API for XML-Based Web services 2.1 (JAX-WS) Web services,
• Java API for XML-Based RPC 1.1 (JAX-RPC) Web services.

How Do I Choose Between JAX-WS and JAX-RPC?

Security

The WS-Security specification lets you configure advanced features of Web services using WS-Policy files.

A WS-Policy file is an XML file that contains:

• security-specific
• or Web service reliable messaging-specific XML elements

that describe the security and reliable-messaging configuration, respectively.

For information about the WS-Policy specification, see Web Services Policy Framework (WS-Policy) 1.5 and 1.2.

Tools

The following Oracle IDE tools are available to build Web services:

• Oracle JDeveloper
• Oracle Enterprise Pack for Eclipse (OEPE)—Provides a collection of plug-ins to the Eclipse IDE platform that facilitate development of WebLogic Web services.

Or the following framework:

• Java - Metro

Documentation / Reference

• Anatomy of a WebLogic Web Service
• Oracle WebLogic - JWS Annotation Reference