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15.3.4 Using the @WebParam annotation
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You can utilize the @javax.jws.WebParam annotation in conjunction with @WebMethod to customize a parameter for the web service message part generated in the WSDL. You saw a simple use of @WebParam in the PlaceBid EJB web service in section 15.3; here is a more comprehensive example:
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@WebMethod public Long addBid(
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@WebParam(name = "user", mode = WebParam.Mode.IN) String userId, ...) { ... }
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Let s break this example down by looking at this annotation s details. The specification for the @WebParam annotation looks like this:
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@Target({PARAMETER}) public @interface WebParam { public enum Mode { IN, OUT, INOUT }; String name() default ""; String targetNamespace() default ""; Mode mode() default Mode.IN; boolean header() default false; String partName() default ""; };
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The name element can specify the name parameter for the message in the WSDL. If you do not specify name, the default value generated will be the same as the name of the argument. You can use the targetNamespace element for customizing the XML namespace for the message part. If you do not specify targetNamespace, the server will use the namespace used for the web service. The mode element will work to specify the type of the parameter. Valid options are IN, OUT, or INOUT (both). This mode determines how the parameter is flowing. If you specify a parameter as OUT or INOUT, the argument must be of type javax. xml.ws.Holder as follows:
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@WebParam(name = "user", mode = WebParam.Mode.INOUT) Holder<String> userId, ...) { ... }
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The holder class provides a reference to immutable object references. You can use a Java generic holder type, javax.xml.ws.Holder<String>, which is defined by the Java XML web services specification. The details of Holder types are not within the scope of this book; for more details, refer to the Java XML WS 2.0 specification. You can set the header element to true if the message is pulled from the header of the message and not from the message body. As we discussed earlier, you can pass any optional information (such as security) that isn t part of the actual message in the SOAP header. When a SOAP message is exchanged between parties, it may go through several intermediaries, such as an authentication system. These intermediaries are not supposed to read
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Exposing EJBs as web services
the actual payload or message body, but are allowed to read the SOAP header. Setting header to true will generate the WSDL with the SOAP header as follows:
<operation name = "addNewBid"> <soap:operation soapAction = "urn:NewBid"/> <input> <soap:header message = "tns:PlaceBid_addNewBid" part = "user" use = "literal"/> <soap:body use = "literal" parts = "parameters"/> </input> ... </operation>
You can use the partName element to control the generated name element of the wsdl:part or XML schema element of the parameter, if the web service binding style is RPC, or if the binding style is document and the parameter style is BARE. If you don t specify the name for an RPC-style web service and partName is specified, the server will use partName to generate the name of the element.
15.3.5 Using the @WebResult annotation The @WebResult annotation is very similar to @WebParam. It operates in conjunction with @WebMethod to control the generated name for the message return value in the WSDL, as illustrated here:
@WebMethod @WebResult(name = "bidNumber") public Long addBid(...){}
The @WebResult annotation specification resembles the specification for @WebParam. You ll notice it s a bit smaller, though, because you have less control over return values than you do over parameters.
public @interface WebResult { String name() default "return"; String targetNamespace() default ""; boolean header() default false; String partName() default ""; };
The name element specifies the name of the value returned in the WSDL. Use the targetNamespace element for customizing the XML namespace for the returned value. This works for document-style web services where the return value binds to an XML namespace. If you don t specify targetNamespace, the server will use the namespace allocated for the web service.
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