WEBSERVICE USING APACHE AXIS TUTORIAL-2 UNDERSTANDING APACHE AXIS

WEBSERVICE USING APACHE AXIS TUTORIAL-2 UNDERSTANDING APACHE AXIS
(part-3) (published in DeveloperIQ..April,2004)(www.developeriq.com) R.S.RAMASWAMY([email protected])

DROP-IN DEPLOYMENT IN AXIS

First and foremost, we need to install Axis1.1 for Windows, in our system.� The January 2004 issue of DeveloperIQ dealt with Apache and the CD also carried a lot of Apache software.� But ?Axis1.1 for windows? was missing there.� So, we have to download it from the Apache website (http://xml.apache.org).It has been installed as c:\axis11. (The unzipped folder is about 30MB.).

Secondly, we need tomcat4.1, for deploying axis.� (It has been given in the March-2003 CD of DeveloperIQ.) It has been installed as d:\tomcat41.

We will find a folder, named ?axis? in ?c:\axis11\webapps? directory.Copy this ?axis? folder to:� ?d:\tomcat41\webapps? directory.

We need ?activation.jar?.� Copy activation.jar to:

d:\tomcat41\webapps\axis\web-inf\lib?

(tomcat4.1\common\lib)

After completing these preliminary steps, we create ?sqlaxisbean.java? in c:\sam folder, as given. (If we carefully study the code for the ConsoleClient, jsp and this bean, we will find that all of them are similar.)

//� sqlaxisbean.java

import java.sql.*;

import java.util.*;

import javax.ejb.*;

import javax.naming.*;

import java.rmi.*;

public class� sqlaxisbean

{

String�� a;

� public�� sqlaxisbean()

� {

� a="";

� }

� public String callejb(String s)

� {��

�� try

�� {

�� Properties�� props=new Properties();

�� props.put

�� (Context.INITIAL_CONTEXT_FACTORY,

�� "weblogic.jndi.WLInitialContextFactory"); 0

�� String url="t3://127.0.0.1:7001";

�� props.put(Context.PROVIDER_URL,url);

�� Context context=new InitialContext(props); 1

System.out.println("context ok..");

�� sqlhome home=(sqlhome)context.lookup("sqlejbJndi");

System.out.println("home ok.."); 2

�� sqlremote remote=home.create();

System.out.println("remote ok..");

�� a=remote.showdata(s); 3

�� System.out.println(a);

�� }catch(Exception e1)

�� {System.out.println(" "+e1);} 4

�� return a;

� }

As we are now studying ?Drop-in Deployment?, we just copy this source file? into: ?d:\tomcat41\webapps\axis? folder as ?sqlaxisClient.jws? Carefully note that we have changed the file extension from *.java to�� *.jws. 5

Let us now start tomcat4.1 as follows:

d:\tomcat41\bin>set JAVA_HOME=D:\JDK141

d:\tomcat41\bin> 6

set path=c:\windows\command;d:\jdk141\bin;

d:\tomcat41\bin>startup

After the tomcat server is fully started (you get the messages as ?jk running?) we can test out Axis installation over tomcat as follows: Start the browser and type the URL as:?http://localhost:8080/axis/index.html?.We get the Axis welcome page: 7

If we type the URL as:?http://localhost:8080/axis/AxisServlet?, we get another page saying:�� ?there is a webservice here?.After satisfying ourselves that things are alright, we type the URL as: ?http://localhost:8080/axis/sqlaxisbean.jws?. We get a link and when we click on this link, we get a wsdl file automatically generated. This is an XML file.� Search this file to checkup whether the name of our method, namely ?callejb? occurs there.� It will be there! So, our ejb axis service is up and running. It is now time to create a simple Console-Client in java to satisfy ourselves that our ejb is really available to be accessed by using the wsdl file.

So, we now create the Console-Client for the webservice as shown.

//� sqlaxisbeanClient.java 8

import java.net.*;

import javax.xml.rpc.ParameterMode;

import org.apache.axis.client.Service; 9

import org.apache.axis.client.Call;

import org.apache.axis.encoding.XMLType;

import javax.xml.namespace.QName; 0

public class sqlaxisbeanClient

{

�� public static void main(String args[]) 1

�� {

�� try

�� { 2

�� System.out.println("Start");

�� Service�� service=�� new Service();

�� System.out.println("Service ready"); 3

�� Call ��call= (Call)service.createCall();

�� System.out.println("call ready");

�� URL�� url=new� URL("http://localhost:8080/axis/sqlaxisbean.jws"); 4

�� call.setTargetEndpointAddress(url);

�� call.setOperationName("callejb");

�� call.addParameter("something", XMLType.XSD_STRING,ParameterMode.IN); 5

�� call.setReturnType(XMLType.XSD_STRING);

�� String�� r�� = (String)call.invoke(new Object[]{args[0]});

�� System.out.println(r); 6

�� }

�� catch(Exception e1){System.out.println(""+e1);}

�� } 7

}

We have to set correct classpath for the window to include a number of files required for Axis.As it will be tedious to type it every time, we have created a batch file named ?setcpath.bat?. Please note that it should be typed in a single line continuously as given.�� 8

//�� setcpath.bat

�set� classpath=c:\sam; d:\bea\weblogic700\lib\weblogic.jar;

c:\axis11\lib\axis.jar; 9

c:\axis11\lib\jaxrpc.jar;

c:\axis11\lib\saaj.jar;

c:\axis11\lib\commons-logging.jar; 0

c:\axis11\lib\commons-discovery.jar;

c:\axis11\lib\wsdl4j.jar;

c:\tomcat4.1\common\lib\activation.jar; 1

c:\tomcat4.1\common\lib\xerces.jar

After creating this file, we can simply type at the prompt,sam> setcpath. This will create the correct classpath for the working window.� We will now be able to compile jwsclient.java. After compiling, we can execute the program:>java jwsclient ?select * from table1?. We will get names and numbers.� This was tested and found to be ok.Thus, we have developed and ejb, and accessed it as an xml webservice!

In the next article of this seven-part tutorial, we will take up the wsdd method.� Continued in axis2d.htm 2

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WEBSERVICE USING APACHE AXIS TUTORIAL-2 UNDERSTANDING APACHE AXIS

WEBSERVICE USING APACHE AXIS TUTORIAL-2 UNDERSTANDING APACHE AXIS

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