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It is important to note that both that service requester and service provider, which are compliant with JSR 109, can interoperate with any other service implementation. In particular, JSR 109 does not preclude the service being invoked by a J2SE client using the default JAX-RPC mechanism. In the case of JSR 109, the service requester could be a session EJB. The constraints imposed by JAX-RPC on the interfaces to be implemented and the exceptions thrown are somewhat relaxed by JSR 109. The only requirement is that the service implementation must implement all the operations of the service end point interface. Building Web Service Clients We first focus on the top-down approach to building Web Service clients, in which WSDL is constructed first and then a tool is used to generate the Web Service and the Web Service client. In discussing the files generated by the tool, we will only focus on the most basic structure of the files and ignore the other, more detailed structures that may be created by using the tool. Specifically, we will concentrate on the files generated by the tools WSDL2Java and Java2WSDL. The IBM-provided tools wrap these two tools to provide more functionality;
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they should be used for production class Web Services. We use these tools in our discussion in order to focus on the most basic aspects of services files generation. For this discussion we assume that a WSDL file called AddressBook .wsdl defines the interface and implementation portions of the Web Service, which corresponds to a telephone address book. WSDL was discussed in detail in 13. The service defines a single operation, addEntry(), that is used to enter a new phone address in the phone book along with a name. The invocation command is shown in Listing 15-1. Note that this assumes you are in the directory that contains the WSDL file for the Web Service.
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Listing 15-1
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%java org.apache.axis.wsdl.WSDL2Java AddressBook.wsdl
The generated files would be put in a directory, which we will call AddressFetcher. The files are put in this particular directory because it is the target namespace from the WSDL file, and namespaces map to Java packages. Namespaces were discussed in 11. Before we discuss the generated files that correspond to each section of the WSDL file, we need to note the standard mappings from WSDL to Java types. These mappings are summarized in Table 15.2. Corresponding to each section, the tool generates one or more files. These generated files and the WSDL sections they correspond to are shown in Table 15.3.
TABLE 15.2
WSDL-to-Java Standard Mappings Java Type boolean int java.math.BigInteger long short java.math.BigDecimal oat double java.lang.String java.util.Calendar
WSDL Type xsd:boolean xsd:int xsd:integer xsd:long xsd:short xsd:decimal xsd: oat xsd:double xsd:string xsd:dateTime
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TABLE 15.3 Generated Classes Corresponding to the Different Sections of the WSDL Document
WSDL Section For each entry in the type section For each portType For each binding For each service
Generated Java Class(es) A java class A holder class if this type is used as an inout or out parameter A java interface A stub class A service interface A service implementation (the locator)
Next, we consider each section of the WSDL and the generated files that correspond to those sections, starting with the types section.
The types Section
For simplicity, we assume that this types section contains only one type, which is an XML complexType, as shown in Listing 15-2. The listing shows that the name attribute of the complexType is phone and the three elements correspond to the area code, telephone exchange, and number. Two of these elements are of the xsd:string type, and the third element is of type xsd:int.
Listing 15-2
<xsd:complexType name="phoneNumber"> <xsd:all> <xsd:element name="areaCode" type="xsd:int"/> <xsd:element name="exchange" type="xsd: string"/> <xsd:element name="number" type="xsd:string"/> </xsd:all> </xsd:complexType>
WSDL2Java would create the class shown in Listing 15-3, which in this case is a bean (as is typically the case) from the preceding section of the WSDL file.
Listing 15-3
public class PhoneNumber implements java.io.Serializable { private int areaCode; private java.lang.String exchange; private java.lang.String number; public int getAreaCode ( ) { return areaCode; }
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