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25.2. Generating the Starting Point Code

Overview
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JAX-WS specifies a detailed mapping from a service defined in WSDL to the Java classes that will implement that service as a service provider. The logical interface, defined by the wsdl:portType element, is mapped to a service endpoint interface (SEI). Any complex types defined in the WSDL are mapped into Java classes following the mapping defined by the Java Architecture for XML Binding (JAXB) specification. The endpoint defined by the wsdl:service element is also generated into a Java class that is used by consumers to access service providers implementing the service.
The cxf-codegen-plugin Maven plug-in generates this code. It also provides options for generating starting point code for your implementation. The code generator provides a number of options for controlling the generated code.

Running the code generator
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Example 25.1, “Service Code Generation” shows how to use the code generator to generate starting point code for a service.

Example 25.1. Service Code Generation

<plugin>
    <groupId>org.apache.cxf</groupId>
    <artifactId>cxf-codegen-plugin</artifactId>
    <version>${cxf.version}</version>
    <executions>
        <execution>
            <id>generate-sources</id>
            <phase>generate-sources</phase>
            <configuration>
                <sourceRoot>outputDir</sourceRoot>
                <wsdlOptions>
                    <wsdlOption>
                        <wsdl>wsdl</wsdl>
                        <extraargs>
                            <extraarg>-server</extraarg>
                            <extraarg>-impl</extraarg>
                        </extraargs>
                    </wsdlOption>
                </wsdlOptions>
            </configuration>
            <goals>
                <goal>wsdl2java</goal>
            </goals>
       </execution>
    </executions>
</plugin>
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This does the following:
  • The -impl option generates a shell implementation class for each wsdl:portType element in the WSDL contract.
  • The -server option generates a simple main() to run your service provider as a stand alone application.
  • The sourceRoot specifies that the generated code is written to a directory called outputDir.
  • wsdl element specifies the WSDL contract from which code is generated.
For a complete list of the options for the code generator see Section E.2, “cxf-codegen-plugin”.

Generated code
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Table 25.1, “Generated Classes for a Service Provider” describes the files generated for creating a service provider.
Expand
Table 25.1. Generated Classes for a Service Provider
FileDescription
portTypeName.java The SEI. This file contains the interface your service provider implements. You should not edit this file.
serviceName.javaThe endpoint. This file contains the Java class consumers use to make requests on the service.
portTypeNameImpl.java The skeleton implementation class. Modify this file to build your service provider.
portTypeNameServer.javaA basic server mainline that allows you to deploy your service provider as a stand alone process. For more information see Chapter 29, Publishing a Service.
In addition, the code generator will generate Java classes for all of the types defined in the WSDL contract.

Generated packages
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The generated code is placed into packages based on the namespaces used in the WSDL contract. The classes generated to support the service (based on the wsdl:portType element, the wsdl:service element, and the wsdl:port element) are placed in a package based on the target namespace of the WSDL contract. The classes generated to implement the types defined in the types element of the contract are placed in a package based on the targetNamespace attribute of the types element.
The mapping algorithm is as follows:
  1. The leading http:// or urn:// are stripped off the namespace.
  2. If the first string in the namespace is a valid Internet domain, for example it ends in .com or .gov, then the leading www. is stripped off the string, and the two remaining components are flipped.
  3. If the final string in the namespace ends with a file extension of the pattern .xxx or .xx, then the extension is stripped.
  4. The remaining strings in the namespace are appended to the resulting string and separated by dots.
  5. All letters are made lowercase.
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