June 2003
Intermediate to advanced
672 pages
23h 48m
English
Content preview from Java Web Services in a Nutshell
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J2EE Web Service APIs
Java web services are one of the major new features in the J2EE 1.4 platform, which has integrated versions of some of the APIs that Sun Microsystems released as part of the Java Web Services Developer’s Pack in 2002. Figure 1-2 shows the various web service APIs (represented by the shaded areas) and how they fit together.
Figure 1-2. The J2EE 1.4 and JWSDP web service APIs
Working up from the bottom of the diagram, by definition, all web services depend on XML, since the messages exchanged between the service provider and the service consumer are encoded in XML. At the present time, these messages are carried using the SOAP protocol, which is itself based on XML. It is generally accepted, however, that SOAP is only the current state of the art and need not be the only web service protocol. Layered above SOAP and XML are the various web service APIs, which are summarized in the following sections:
- WSDL
As described earlier, WSDL is an XML vocabulary used to describe the interface provided by a web service. Both J2EE 1.4 and JWSDP support the use of WSDL 1.1 to specify service interfaces, but do not provide an API for application code to directly manipulate WSDL. At the time of this writing, a standard API (called JWSDL) that provides this functionality is under development by the JSR 110 expert group. See http://jcp.org/jsr/detail/110.jsp for details. WSDL is discussed ...
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