Iteration 4: Testing Web Services for Interoperability in Java

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Iteration 4: Testing Web Services for Interoperability
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Web is that there is no single dominant technology The Web is composed of a highly heterogeneous combination of hardware, operating systems, and programming languages Web services achieve interoperability by using XML, which is an architecturally neutral text format However, this interoperability comes at a price since textual formats are less efficient than binary alternatives Therefore if Web services fail to interoperate in practice, then we have paid the performance penalty for nothing The interoperability of the first wave of Web services was, in fact, disappointing, largely due to ambiguities, errors, and omissions in the initial SOAP 11 and WSDL 11 specifications These specifications did not go through the rigorous standards development processes established by the W3C Instead, SOAP 11 and WSDL 11 were simply W3C Notes, which are specifications contributed by members The follow-on specifications, SOAP 12 and WSDL 20, corrected these deficiencies However, the industry could not wait for these revisions and instead created the Web Services Interoperability Organization (WS-I) to fix the problem WS-I issued the Basic Profile (BP) 10 to establish interoperability guidelines One of the key recommendations of BP 10 was to use the document/literal binding for SOAP BP 10 was later split into two specifications, the Simple SOAP Binding Profile (SSBP) 10 and the Attachments Profile (AP) 10 WTP includes WS-I Test Tools, which can validate HTTP SOAP messages and WSDL documents for WS-I compliance These tools began life at WS-I as the reference Java implementation They were then contributed to Eclipse as the Web Services Validation Tools (WSVT) Technology project WSVT was created while the more comprehensive WTP top-level project proposal was being reviewed by the Eclipse Foundation After WTP was approved, WSVT graduated into it
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Checking Messages for WS-I Compliance
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The WS-I Test Tools include two main components The first component is an extension to the WSDL validator You can check a WSDL document for WS-I compliance by enabling the WS-I compliance preferences and then validating the document as usual The second component is a message log validator This component is integrated with the TCP/IP monitor You can save the messages captured by the monitor into an XML log file and run the message log validator on it to check for WS-I compliance You ll be validating messages for WS-I compliance in this iteration The WSDL and message log validation and WS-I compliance levels are specified in the Profile Compliance and Validation preference page (see Figure 1036)
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CHAPTER 10 Web Services
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Figure 1036 Profile Compliance and Validation Preference Page
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1 Return to the Web browser with the JSP test client running in it, which you launched in the previous iteration If you already closed the JSP test client, select the TestClientjsp file in the sampleUpdateProxy subfolder of the WebContent folder in the IceHockeyServiceClient project, and execute the Run as Run on Server command to open it Click the getEndpoint method in the Methods pane Click the Invoke button in the Inputs pane View the endpoint address in the Result pane Note the port number on the endpoint URL, for example, 12302, instead of the usual 8080 for Tomcat (see Figure 1037) This unusual port number is used by an instance of the TCP/IP monitor 2 Open the Preferences dialog and select the TCP/IP Monitor page (see Figure 1038) Note that the port number of the monitor matches the port number of the endpoint You can use this Preference page to manage TCP/IP monitor instances A TCP/IP monitor instance listens to some port on localhost and forwards the requests to another, possibly remote, host and port You can manually configure the JSP test client endpoint address to use a TCP/IP monitor instance by getting the current endpoint using the getEndpoint method and setting it to match the TCP/IP monitor port using the setEndpoint method
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