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Simple database access sample application Sample applications SPECjAppServer2004

Application Overview

The sample application referred in this article is a simple calculator which performs addition of two integers. The client application referred here is not a J2EE application. It is a regular Java client which will call a web service to carry out the application functionality. Web service is exposed as a Servlet in the Geronimo application server.

Service implementation

The Calculator interface defines the Service Endpoint Interface (SEI) for the Web Service.

Calculator.java
package org.apache.geronimo.samples.jws;

import javax.jws.WebService;
import javax.jws.WebMethod;
import javax.jws.WebParam;

@WebService(name="CalculatorPortType",
            targetNamespace = "http://jws.samples.geronimo.apache.org")
public interface Calculator {

    @WebMethod
    public int add(@WebParam(name = "value1") int value1,
                   @WebParam(name = "value2") int value2);

}

The CalculatorService class implements the Web Service business logic. It implements all the methods defined in the SEI. The class does not need to implement the Calculator interface but must reference it through the @WebService.endpointInterface annotation. This class will be exposed as a Servlet through web.xml file even though it does not extend the javax.servlet.Servlet class.
The context variable marked with the @Resource annotation will be injected at runtime. The WebServiceContext can be used to obtain the message context and security information relative to the call.

CalculatorService.java
package org.apache.geronimo.samples.jws;

import javax.annotation.Resource;
import javax.jws.WebService;
import javax.xml.ws.WebServiceContext;

@WebService(serviceName = "Calculator",
            portName="CalculatorPort",
            endpointInterface = "org.apache.geronimo.samples.jws.Calculator",
            targetNamespace = "http://jws.samples.geronimo.apache.org",
            wsdlLocation = "WEB-INF/wsdl/CalculatorService.wsdl")
public class CalculatorService implements Calculator {

    @Resource
    private WebServiceContext context;

    public int add(int value1, int value2) {
        System.out.println("User Principal: " + context.getUserPrincipal());
        return value1 + value2;
    }
}

The web.xml descriptor is used to deploy the Web Service.

web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://java.sun.com/xml/ns/javaee" version="2.5">
	<servlet>
		<display-name>CalculatorService</display-name>
		<servlet-name>CalculatorService</servlet-name>
		<servlet-class>
			org.apache.geronimo.samples.jws.CalculatorService
		</servlet-class>
	</servlet>
	
	<servlet-mapping>
		<servlet-name>CalculatorService</servlet-name>
		<url-pattern>/calculator</url-pattern>
	</servlet-mapping>	

        .....
</web-app>

web.xml

The web.xml descriptor is not necessary for simple JAX-WS web service deployments. If the web.xml descriptor is not provided, it will be automatically generated during deployment.

The geronimo-web.xml descriptor is optional but it is used in this sample to specify the module name. Information about the project (e.g. module's unique identification, any dependencies) is described inside the <environment> tag. In this case, there are no dependencies so they do not need to be listed. However, it is a good idea to give this module some sort of unique identification, so that it can later be referenced by some other deployable application.

geronimo-web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://geronimo.apache.org/xml/ns/j2ee/web-1.1">
  <dep:environment xmlns:dep="http://geronimo.apache.org/xml/ns/deployment-1.1">
    <dep:moduleId>
      <dep:groupId>${pom.groupId}</dep:groupId>
      <dep:artifactId>${pom.artifactId}</dep:artifactId>
      <dep:version>${version}</dep:version>
      <dep:type>war</dep:type>
    </dep:moduleId>
  </dep:environment>

 <context-root>/jaxws-calculator</context-root>

 <service-ref>
   <service-ref-name>services/Calculator</service-ref-name>
   <port>
      <port-name>CalculatorPort</port-name>
      <protocol>http</protocol>
      <host>localhost</host>
      <port>8080</port>
      <uri>/jaxws-calculator/calculator</uri>
   </port>
 </service-ref>
</web-app>

The following WSDL file describes the Web Service:

CalculatorService.wsdl
<?xml version="1.0" encoding="UTF-8"?>
<wsdl:definitions name="Calculator"
    xmlns="http://schemas.xmlsoap.org/wsdl/"
    xmlns:soap="http://schemas.xmlsoap.org/wsdl/soap/"
    xmlns:wsdl="http://schemas.xmlsoap.org/wsdl/"
    xmlns:xsd="http://www.w3.org/2001/XMLSchema"
    targetNamespace="http://jws.samples.geronimo.apache.org"
    xmlns:tns="http://jws.samples.geronimo.apache.org">

    <wsdl:types>
        <xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema" 
                    xmlns="http://jws.samples.geronimo.apache.org" 
                    targetNamespace="http://jws.samples.geronimo.apache.org"
                    attributeFormDefault="unqualified" elementFormDefault="qualified">

             <xsd:element name="add">
                <xsd:complexType>
                   <xsd:sequence>
                      <xsd:element name="value1" type="xsd:int"/>
                      <xsd:element name="value2" type="xsd:int"/>
                   </xsd:sequence>
                </xsd:complexType>
             </xsd:element>

             <xsd:element name="addResponse">
                <xsd:complexType>
                   <xsd:sequence>
                      <xsd:element name="return" type="xsd:int"/>
                   </xsd:sequence>
                </xsd:complexType>
             </xsd:element>
        </xsd:schema>
    </wsdl:types>
  
    <wsdl:message name="add">
       <wsdl:part name="add" element="tns:add"/>
    </wsdl:message>

    <wsdl:message name="addResponse">
       <wsdl:part name="addResponse" element="tns:addResponse"/>
    </wsdl:message>

    <wsdl:portType name="CalculatorPortType">
       <wsdl:operation name="add">
         <wsdl:input name="add" message="tns:add"/>
         <wsdl:output name="addResponse" message="tns:addResponse"/>
       </wsdl:operation>
    </wsdl:portType>
        
    <wsdl:binding name="CalculatorSoapBinding" type="tns:CalculatorPortType">
        <soap:binding style="document" transport="http://schemas.xmlsoap.org/soap/http"/>
        
        <wsdl:operation name="add">
            <soap:operation soapAction="add" style="document"/>
            <wsdl:input name="add">
                <soap:body use="literal"/>
            </wsdl:input>
            <wsdl:output name="addResponse">
                <soap:body use="literal"/>
            </wsdl:output>
        </wsdl:operation>
                
    </wsdl:binding>
  
    <wsdl:service name="Calculator">
        <wsdl:port name="CalculatorPort" binding="tns:CalculatorSoapBinding">
            <soap:address location="http://localhost:8080/jaxws-calculator-1.0/calculator"/>
        </wsdl:port>
    </wsdl:service>
      
</wsdl:definitions>

webservices.xml

In J2EE version 1.4, the webservices.xml file was also necessary to describe the Web Service. In Java EE 5 that file is optional and is not required in this example.

JSP-based JAX-WS client

The add.jsp is a basic client for the CalculatorService Web Service.

add.jsp
<%@ page language="java" contentType="text/html; charset=ISO-8859-1" pageEncoding="ISO-8859-1"%>
<%@ page import="javax.naming.InitialContext,javax.xml.ws.Service,org.apache.geronimo.samples.jws.Calculator"%>
<html  xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
<head>
  <title>Apache Geronimo Sample Application - JAX-WS Calculator</title>
  <meta content="text/html; CHARSET=iso-8859-1" http-equiv="Content-Type">
</head>

<BODY>
  <font face="Verdana, Helvetica, Arial">

    <h3>This is a JAX-WS web service sample application.   Please type the value 1 and value 2 below to see the add result.</h3>
    <form action="add.jsp">
        Value 1: <input type="text" name="value1">   Value 2: <input type="text" name="value2"> <input type="submit" value="Add">
    </form>
    <br>
<%
    String value1 = request.getParameter( "value1" );
    String value2 = request.getParameter( "value2" );

    if (value1 != null && value1.trim().length() > 0 &&
        value2 != null && value2.trim().length() > 0) {

        out.println("<h4>");

        try {
            int v1 = Integer.parseInt(value1);
            int v2 = Integer.parseInt(value2);
    
            InitialContext ctx = new InitialContext();
            Service service = (Service)ctx.lookup("java:comp/env/services/Calculator");
            Calculator calc = service.getPort(Calculator.class);         
            int sum = calc.add(v1, v2);
            out.println("Result: " + v1 + " + " + v2 + " = " + sum);
        } catch ( Exception e ) {
            out.println("Error: " + e.getMessage());
       }

       out.println("</h4>");
    }
%>

  </FONT>
</body>
</html>

The add.jsp looks up a Web Service reference in the JNDI tree. The Web Service reference must first be added the web.xml file.

web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://java.sun.com/xml/ns/javaee" version="2.5">
        .....

        <service-ref>
            <service-ref-name>services/Calculator</service-ref-name>
            <service-interface>javax.xml.ws.Service</service-interface>
            <wsdl-file>WEB-INF/wsdl/CalculatorService.wsdl</wsdl-file>
        </service-ref>

        .....
</web-app>

Resource injection in JSP

Since the resource injection is not supported in JSPs the service-ref must be added explicitly to the web.xml file.

Building and Deploying Sample Application

Checkout the sample source code from SVN:

svn checkout http://svn.apache.org/repos/asf/geronimo/samples/trunk/samples/jaxws-calculator calculator

The source code will be checked out into the calculator/ directory. This sample code code lives in calculator/jaxws-calculator-war/ directory.

Required Tools

The tools used for developing and building the Calculator sample application are:

Apache Maven 2.0.x

Apache Maven is used for building the Calculator application.

Building

Compile Source Code

From command prompt execute the following command in the calculator/jaxws-calculator-war/ folder:

mvn install

After the code is successfully compiled a jaxws-calculator-war-2.0-SNAPSHOT.war file will be created in the target/ subfolder.

Deploying

Deploy the jaxws-calculator-war-2.0-SNAPSHOT.war using the Geronimo Console (http://localhost:8080/console):

  1. Scroll to Deploy New from the Console Navigation panel.
  2. Load jaxws-calculator-war-2.0-SNAPSHOT.war from calculator/jaxws-calculator-war/target/ folder in to the Archive input box.
  3. Press Install button to deploy application in the server.

Testing of the Sample

To test this sample service use the add.jsp (http://localhost:8080/jaxws-calculator/add.jsp) to invoke the Web Service. Once the JSP page loads type in two values to add and press the Add button. The result of the addition should show up below. For example:

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