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BEA, like HP, was working on XML-based protocols and products of its own when Web services hit Like Sun Microsystems, BEA attended the June 2000 W3C Workshop on XML Protocols in Amsterdam to help evaluate whether to support SOAP B the time of the WSDL submission to y W3C later that year, BEA had joined the effort as a cosubmitter, clearly indicating its support for Web services Since then, BEA has become very active in the Web services community and, like other application server vendors, has begun shipping Web services support in its products BEA is active at W3C and in the JCP efforts to define Java APIs for Web services technologies BEA's Web service implementation centers on its WebLogic flagship application server product Web Services for the J2EE Professional WebLogic Server has two ways to create and to consume Web services Each approach is targeted at a different developer audience For the J2EE professional developer, WebLogic Server provides an intuitive way to expose J 2EE components as Web services For developers who are not comfortable with the complexity of the J2EE programming model, a new IDE and framework, named WebLogic Workshop, provides a higher level of programming abstraction that shields the developer from the complexities of J2EE and object-oriented programming Web services for the J2EE professional are implemented using three types of components:
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Back-end J2EE components Handlers, for preprocessing and postprocessing SOAP requests Serializers and deserializers, for converting data between an XML representation and Java objects
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These components are linked together in a pipeline model of processing The pipeline allows developers greater control over the handling and ordering of processing of SOAP messages
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Understanding Web Services- XML, WSDL, SOAP and UDDI
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Back-end components can be one or more stateless session EJBs for RPC calls or message-driven beans for asynchronous messaging WebLogic Server provides a simple mechanism for exposing the appropriate EJB methods as operations of a Web service and generates the associated WSDL file automatically Handlers are optional components that provide access to the SOAP message before and after invoking the back-end component They typically are used for processing and manipulating SOAP header information WebLogic Server provides a framework for automatically converting data between XML and Java The Web services can therefore be designed only in Java without having to process XML directly Support for the simple data types defined in the SOAP specification are built in Complex or user-defined data types can be converted by using optional serializer/deserializer objects The WebLogic Autotyper utility can be used to generate a serializer and a deserializer that will handle the conversion at runtime As input, WebLogic Autotyper will accept an XML or a Java representation of the types and will generate the equivalent Java or XML representation along with the serializer/deserializer The handlers and the serializers and deserializers make use of an innovative new XML parser, called a pull parser A pull parser, sometimes known as a tokenizing parser, enables a developer to extract a subset of the XML document in a very high performant manner WebLogic Workshop WebLogic Workshop is an IDE that is targeted at the developer who prefers a GUI-based approach to application development Borrowing from the Visual Basic paradigm WebLogic Workshop allows developers to define a Web service and its interaction with system resources, using visual metaphors The developer can then drop down in the code view and define the procedural logic for the Web service WebLogic Workshop developers work within a higher level of programming abstraction that shields them from the complexities of J2EE and object-oriented programming This exposes the power of Web services, J2EE, and WebLogic Server to a new class of developer Web Services Standards WebLogic Server supports the most common Web services standards, notably, SOAP, XML schema, WSDL, and UDDI In addition, support for conversational Web services is included
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