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ParameterStyle parameterStyle() default ParameterStyle.WRAPPED; }
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You can use the style element to define the web service style. Valid values are DOCUMENT and RPC b in listing 15.4. The default style is DOCUMENT. You can specify the use element to configure the messaging style with one of the valid values, LITERAL or ENCODED c. You must use the LITERAL style of messaging if you expect your services to work with clients not developed by you, because SOAP encoding can cause problems with interoperability of web services and therefore is not allowed by the WS-I Basic Profile 1.1. You can specify parameterStyle to configure how message parameters are specified. The valid values for parameterStyle are BARE and the default, WRAPPED d.
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15.3.3 Using @WebMethod
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You can apply the @javax.jws.WebMethod annotation on a method to expose it as part of the web service. If you have multiple methods in the bean implementation class and you use a generated endpoint interface, you must annotate @WebMethod on the methods you want to expose in the web service. The following listing shows the details of the @WebMethod annotation:
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@Target({METHOD}) public @interface WebMethod { String operationName() default ""; String action() default "" ; boolean exclude() default false; };
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If you don t use the @WebMethod annotation, all public methods in the bean class that use a generated interface will be exposed in the web service. There are several reasons why this may not be a good idea. First, it is inefficient to have fine-grained web service methods. Like EJBs, web services should be coarse-grained. Second, it might create a tight coupling between your server and potential clients.
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NOTE
If you use the @WebMethod annotation on an endpoint interface, your server will ignore it and expose all methods of the endpoint interface in the web service.
If you have multiple methods in the bean class and there are methods that you don t want to expose in the web service, you can set the exclude element to true as follows:
@WebService(endPointInterface = "PlaceBidSEI") @Stateless public class PlaceBidBean { public Long addBid(..) { } @WebMethod(exclude = "true") public Long persistBid(..) { } }
Using this technique, the persistBid method will not be exposed in the web service when the PlaceBid EJB web service is deployed. You can use the operationName and action elements in the @WebMethod annotation to specify the operation and SOAP action, respectively, as in the following example.
Exposing EJBs as web services
@WebMethod(operationName = "addNewBid", action = "http://actionbazaar.com/NewBid") public Long addBid(...) { }
The operationName, as defined above the addBid method, will generate the following WSDL:
<portType name = "PlaceBidBean"> <operation name = "addNewBid"> ... </operation> </portType>
Notice how the actual method name is addBid but the method named exposed in the web service is addNewBid. You can use this to help map the service contract to the actual implementation. Even if that implementation changes over time, the contract can remain intact. If the operationName isn t specified, it will default to the implementation name of the method. Similarly, the action element we defined earlier will be used for generating the SOAPAction in the WSDL as follows:
<operation name = "addNewBid"> <soap:operation soapAction = "http://actionbazaar.com/NewBid"/> ... </operation>
The SOAPAction element determines the header element in the HTTP request message. It is used by the web service client when communicating with the web service using SOAP over HTTP. The content of the SOAPAction header field is used by the endpoint to determine the true intended destination rather than having to parse the SOAP message body to find this information. This section gave you a tour of the @WebMethod annotation so you know how to define the method name for a web service. Next we ll look at how to define parameters for our new web methods with the @WebParam annotation.
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