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Generating the Starting Point Code

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 wsdl2java command automates the generation of this code. It also provides options for generating starting point code for your implementation, along with an Ant based makefile to build the application. wsdl2java provides a number of arguments for controlling the generated code.

You can generate the code needed to develop your service provider using the following command:

wsdl2java -ant -impl -server -d outputDir myService.wsdl

This command does the following:

  • The -ant argument generates an Ant makefile, called build.xml, for your application.

  • The -impl argument generates a shell implementation class for each wsdl:portType element in the WSDL contract.

  • The -server argument generates a simple main() to run your service provider as a stand alone application.

  • The -d outputDir argument directs wsdl2java to write the generated code to a directory called outputDir.

  • myService.wsdl is the WSDL contract from which code is generated.

For a complete list of the arguments for wsdl2java see wsdl2java in Web Service Tool Reference.

If you are using Apache Ant as your build system, you can call the code generator using Ant's java task as shown in Example 4.1.

The command line options are passed to the code generator using the task's arg element. Arguments that require two strings, such as -d, must be split into two arg elements.

Table 4.1 describes the files generated for creating a service provider.

In addition, wsdl2java will generate Java classes for all of the types defined in the WSDL contract.

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.