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Java IoT: Article

JDJ Feature — Java API for XML Web Services (JAX-WS)

Creating a JAX-WS 2.0 Web Service in WebLogic Server 10

WebLogic Server 10 Technology Preview supports JEE 5. A feature of JEE 5 is the Java API for XML Web Services (JAX-WS) used to create Web Services and Web Service clients. WebLogic Server 10 provides the jwsc task to create the Web Service artifacts and the clientgen task to create the artifacts for Web Service clients. In this article we'll create an example JAX-WS 2.0 Web Service in WebLogic Server 10 Technology Preview.

JAX-WS is an API to create Web applications and Web Services using the XML-based Web Services functionality. To create a Web Service first create a Service Endpoint Implementation (SEI) class. The implementation class is annotated with javax.jws.WebService annotation. The implementation class must not be abstract or final, and must contain a default public constructor.

A Web Service provides operations that are made available to Web Service clients. So add business methods to the Web Service class. The business methods are public and must not be static or final and may be annotated with the javax.jws.WebMethod annotation. By default all public methods are made available as Web Service operations.

Preliminary Setup
Download and install the WebLogic Server 10 Technical Preview. Download and install Apache Ant, which is required to run Ant tasks to create Web Service and client classes. Download and install JDK 5 if not already installed. It's required to run Apache Ant.

Using the WebLogic server Configuration Wizard create a WebLogic domain, base_domain.

Creating a Web Service
We'll create a JAX-WS 2.0 Web Service. First, set the WebLogic server environment by running the setDomainEnv command script.

C:\BEA\user_projects\domains\base_domain\bin> setDomainEnv

Next, create a project directory in the C:\BEA\user_projects directory with the mkdir command. The directory names should be separated with backslashes instead of forward slashes for the mkdir command to run.

C:\BEA\user_projects> mkdir webservices\hello_webservice

Create an src directory under the project directory that contains subdirectories corresponding to the package name of the Java Web Service class.

C:\BEA\user_projects\webservices\hello_webservice>mkdir src\webservices\hello_webservice

Create a Java Web Service (JWS) file for implementing a JAX-WS Web Service. Annotate the Web Service implementation class HelloWsImpl with the @WebService annotation. JSR 181: Web Services Metadata for the Java Platform defines the standard annotations that can be used in a Java Web Service. The javax.jws.WebService annotation specifies that a class implements a Web Service. The attributes that may be specified in the javax.jws.WebService annotation are discussed in Table 1. All of them are optional.

Add a Web Service method that returns a Hello message. By default all public methods are exposed as Web Service operations. Web Service methods may be annotated with the @WebMethod annotation. Attributes operationName and action may be specified in the WebMethod annotation. The operationName attribute specifies the name of the operation as mapped to the wsdl:operation element in the WSDL. Default value is the method name. For SOAP bindings, the action attribute maps to the SoapAction header in the SOAP messages.

The HelloWsImpl Web Service implementation class is listed below.

package webservices.hello_webservice;
import javax.jws.WebService;

@WebService()
public class HelloWsImpl {

     public String hello(String name) {

         return "Hello "+name +" Welcome to Web Services!";

     }

}

Copy the HelloWsImpl.java class to the C:\BEA\user_projects\webservices\hello_webservice\src\webservices\hello_webservice directory.

WebLogic Server 10 provides WebLogic Web Services Ant tasks to create Web Services and client classes. The jwsc Ant task takes an annotated JWS file as input and generates all the artifacts required to create a WebLogic Web Service.
The generated files include the following.

  1. Java Source files that implement a standard JSR-921 Web Service, such as the Service Endpoint Interface (SEI). For a JWS class HelloWsImpl an SEI HelloWsImplPortType.java gets created.
  2. Standard and WebLogic-specific deployment descriptors. The standard webservices.xml deployment descriptor and the JAX-RPC mapping files get created. The WebLogic-specific Web Services deployment descriptor weblogic-webservices.xml also gets created.
  3. The WSDL file that describes the Web Service.
  4. The XML Schema representation of any Java user-defined types used as parameters or return values of Web Service methods.
A jws sub-element of the jwsc element specifies a JWS file. By default jwsc generates a JAX-RPC 1.1 Web Service. To generate a JAX-WS 2.0 Web Service specify the type attribute of the jws element as type="JAXWS".

Subsequent to generating the Web Service artifacts, jwsc compiles the JWS and Java files and packages the generated artifacts and classes into a Web application WAR file. Jwsc also creates an enterprise application directory structure. The Web Service may be deployed as a WAR file or packaged into an EAR file and deployed. Jwsc generates a WAR file corresponding to each jws element that's a direct sub-element of the jwsc element. JWS files may be grouped by adding the jws elements to a module element, which is a direct sub-element of the jwsc element. If a module element is specified only one WAR file is generated.


More Stories By Deepak Vohra

Deepak Vohra is a Sun Certified Java 1.4 Programmer and a Web developer.

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Ajay Vohra is a senior solutions architect with DataSynapse Inc.

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Most Recent Comments
nayanj 10/26/07 02:49:39 PM EDT

The example give in this article is too simple. Information given in this article can even be found in weblogic documentation.. so what additional value does this article? to me NIL.

I would have appreciated a more realistic example where webservice is used along with other libraries like beehive controls and then see how you can jwsc to package this application into an .ear or .war. There are a bunch of cases in which jwsc gives warnings and errors and none of them seem to be discussed/explained in this article.

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