114 Chapter 5 HelloBean The webservices.xml file tells the container where to look for the WSDL file in the package in the element. Likewise, it specifies the location of the JAX-RPC mapping file. Finally, the webservices.xml file defines the Web Service implementation package, the port component. The port component definition lists the fully qualified Java class name of the service endpoint interface and the name of the implementation bean. The simple name is sufficient here as the container already knows the bean details from the ejb-jar.xml file. The port component is linked to the Web Service s port using the element, which gives the name of the port that this port component implements. With this, we re actually done! The container now has all the information that it needs to link the abstract concept of a Web Service as defined in WSDL to the port component that we have just defined by adding a service endpoint interface to our existing HelloBean. Implementing a Web Service Client Web Services clients in J2EE are very similar to regular bean clients. They come in two flavors: Standalone JAX-RPC clients without JNDI access for service lookup J2EE clients (both Web clients and standalone) that can access client- side JNDI contexts Standalone clients without JNDI access, such as remote Java clients not running inside an application server, can be coded using one of two approaches. The first approach is called static stub and relies on statically generated SOAP client stubs, much like RMI stubs. The second approach is called dynamic proxy and retrieves a WSDL description at runtime to generate the dynamic proxy from it. Both approaches rely on the client s knowledge of the service endpoint address URL and not just a symbolic lookup name as with JNDI. These approaches are functionally equivalent. Actually, there is a third option that relies on a dynamic invocation interface (DII) to create call objects at runtime, which allows you to build dynamic bridges and to live without any prior knowledge of a service s WSDL. We do not cover this style of programming here as it is low-level and cumbersome to
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