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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:

@WebMethod public Long addBid(

catch (NamingException ne) { throw ne; } } }

@WebParam(name = "user", mode = WebParam.Mode.IN) String userId, ...) { ... }

Let s break this example down by looking at this annotation s details. The specification for the @WebParam annotation looks like this:

if (invocation.getType() == InvocationType.METHOD) { MethodInvocation methodInvocation = (MethodInvocation)invocation; Method method = methodInvocation.method; if ("increment".equals(method.getName())) { incrementInvocation = true; incrementParameterValue = ((Integer) methodInvocation.arguments[0]) .intValue(); } } InvocationResponse rsp = invocation.invokeNext(); if (incrementInvocation) { int result = ((Integer) rsp.getResponse()).intValue(); if (result != (incrementParameterValue + 1)) { ... throw new Error(errorMsg.toString()); }

Contacting EJBs in a remote server The code in listing 1.4 shows the same LoginServlet class, but this time it contacts a remote EJB container to find the LoginBean EJB. The differences appear in bold.

@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 ""; };

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:

import javax.servlet.*; import javax.rmi.PortableRemoteObject; public class LoginServlet extends HttpServlet { //home interface for the EJB PasswordBean private LoginHome loginHome = null; public void init() { lookupLoginHome(); } public void doGet( HttpServletRequest req, HttpServletResponse res ) { String name = getUserName( req ); String password = getUserPassword( req );

@WebParam(name = "user", mode = WebParam.Mode.INOUT) Holder<String> userId, ...) { ... }

} return rsp; } } The interceptor is activated by adding the pointcut in Listing 9-8 to the jboss-aop.xml file. Listing 9-8. The Deployment of the Postcondition Interceptor <interceptor-pointcut methodFilter="ALL" fieldFilter="NONE" constructorFilter="NONE" class="aop.contracts.postconditions.PostConditionExample"> <interceptors> <interceptor class="aop.contracts.postconditions.PostConditionInterceptor"/> </interceptors> </interceptor-pointcut> Now, if the program is executed, the trace messages in Listing 9-9 are obtained. Listing 9-9. The Trace of the Increment Function when the Postcondition is Applied java.lang.Error: Unfulfilled post-condition for increment. The result (1) is not equal to an incrementation of the passed parameter (1). ... Exception in thread "main" This example shows that a clean Design by Contract approach, implemented with AOP, will help you detect bugs concerning program values.

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

Login loginBean = (Login) PortableRemoteObject.narrow( loginHome.create( name ), Login.class ); Boolean valid } public void doPost( HttpServletRequest req, HttpServletResponse res ) Initializes an { InitialContext instance doGet( req ); with an environment } private void lookupLoginHome() throws NamingException { Properties props = new Properties(); props.put( Context.INITIAL_CONTEXT_FACTORY, getInitParameter( "factory_class" ) ); props.put( Context.PROVIDER_URL, getInitParameter( "url" ) ); = loginBean.login( password );

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: