Injecting a Target Web Service into an EJB

A.

To inject a target web service into an EJB in Java EE 7, you can use the java.xml.ws.WebServiceRef annotation.

The java.xml.ws.WebServiceRef annotation allows you to declare a reference to a web service as an injectable resource, making it available for injection into an EJB. This annotation can be used to inject a web service client or a web service endpoint.

To use the java.xml.ws.WebServiceRef annotation, you need to follow these steps:

1. Declare the web service reference in your EJB class using the @WebServiceRef annotation. This annotation should be placed on the field or setter method that you want to use for injection.

2. Specify the name of the web service reference using the name attribute of the @WebServiceRef annotation. The value of this attribute should match the name of the web service reference that you declared in the web.xml or ejb-jar.xml file.

3. Optionally, you can specify the type of the web service reference using the type attribute of the @WebServiceRef annotation. If you do not specify the type, the type of the injected object will be determined automatically based on the type of the field or setter method.

4. To use the injected web service reference in your EJB methods, simply call the methods of the injected object as you would with any other Java object.

Here's an example of how you can use the java.xml.ws.WebServiceRef annotation to inject a web service reference into an EJB:

javaCopy code
@Stateless public class MyWebServiceClient {      @WebServiceRef(name="myWebServiceRef")    private MyWebService myWebService;      public void callWebService() {       // Use the injected web service reference to call the web service       myWebService.sayHello();    } } 

In this example, we have declared a web service reference named myWebServiceRef using the @WebServiceRef annotation. We have also specified the type of the injected object as MyWebService, which is the interface that defines the web service operations. Finally, we have called the sayHello() method of the injected web service reference to invoke the web service operation.

Overall, using the java.xml.ws.WebServiceRef annotation makes it easy to inject web service references into your EJBs, allowing you to take advantage of the benefits of dependency injection and make your code more modular and maintainable.