Writing Session Bean Web Services 113 WSDL and (Photoshop web design)
Sunday, December 30th, 2007Writing Session Bean Web Services 113 WSDL and the XML/Java Mapping You have seen the WSDL description of the HelloWorld Web Service already. If you are building new Web Services, you can start with a WSDL description of your service and write WSDL directly and then use a WSDL compiler to generate the service endpoint interface in Java. Alternatively, almost all Web Services platforms and SOAP toolkits provide tools to derive WSDL descriptions automatically from Java endpoint interfaces. See the source code for this book for examples of generating WSDL from Java. Packaging and Deploying a Web Service Session Bean The packaging of a Web Service implementation as a stateless session bean is an extension of the packaging for regular stateless session beans, that is, an ejbjar archive. This file contains the usual set of Java classes, plus the service endpoint interface class. The EJB server requires extra information to be able to dispatch incoming SOAP messages to an implementation of the service endpoint interface. First, it needs to know the Java class that will handle these calls. Additionally, it needs the WSDL file with the endpoint address that it should listen on. The WSDL file is provided in the META-INF directory of the ejb-jar archive. The other information is provided in an additional descriptor file, the webservices. xml file, which is also added to the ejb-jar archive s META-INF directory. Your specific J2EE product may provide vendor-specific deployment tools to generate this file. The webservices.xml file for our HelloWorld service is reproduced here:
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