WEBSERVICE USING APACHE AXIS TUTORIAL-2 UNDERSTANDING APACHE AXIS (part-2)

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

Creating and testing an EJB in WebLogic Server.Let us begin by creating our working folder as
c:\sam.

We then edit the three files for EJB in that folder.

sqlremote.java

sqlhome.java)

sqlbean.java

// sqlremote.java

import javax.ejb.*;

import java.rmi.*;

public interface sqlremote extends EJBObject

{

� public String showdata(String s) throws RemoteException;

}

//sqlhome.java

import javax.ejb.*;

import java.rmi.*;

public interface sqlhome extends EJBHome

{

� public sqlremote create() throws RemoteException,CreateException;

}

// sqlejbbean.java

import java.sql.*;

import javax.ejb.*;

import java.rmi.*;

import javax.naming.*;

public class sqlejbbean implements SessionBean 0

{

� public sqlejbbean()

� {} 1

� public String showdata(String s)

� {

�� String r=" "; 2

�� try{

�� Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");

�� String url="jdbc:odbc:dbdemo"; 3

�� Connection con=DriverManager.getConnection(url);

�� Statement st=con.createStatement();

�� ResultSet rs=st.executeQuery(s); 4

�� while(rs.next())

�� {

�� r=r+rs.getString(1)+"\n"+rs.getString(2)+"\n"+"-------"; 5

�� }

�� }catch(Exception e1)

�� {System.out.println(" "+e1);} 6

�� return r;

� }

� public void ejbCreate() {} 7

� public void ejbRemove() {}

� public void ejbActivate() {}

� public void ejbPassivate() {} 8

� public void setSessionContext(SessionContext sc)� {}

}

Please note that Weblogic7 will work only in Windows 2000. So, we are now working in Windows 2000.

Let us now set HOMEPATH & CLASSPATH.

c:\sam>set JAVA_HOME=d:\jdk1.4.2 0

(We have installed jdk1.4.2 in d :\)

c:\sam>set WL_HOME=d:\bea\weblogic700

c:\sam>set path=c:\windows\command;d:\ jdk1.4.2\bin; 1

d:\bea\weblogic700\server\bin;

c:\sam>set classpath=c:\sam;

d:\bea\weblogic700\server\lib\weblogic.jar; 2

We now compile files in c:\sam folder.

c:\sam>javac�� *.java

Create a subfolder named META-INF as follows: 3

( it should be capital letters!)

c:\sam>md META-INF

c:\sam>cd META-INF 4

c:\sam\META-INF>

In META-INF folder, create the following two Deployment-Descriptor files (XML files).� These files are MOST IMPORTANT.� XML files are case-sensitive.�

//�� ejb-jar.xml 5

<?xml version="1.0"?>

<!DOCTYPE ejb-jar PUBLIC

"-//Sun Microsystems, Inc.//DTD Enterprise JavaBeans 1.1//EN" 6

"http://java.sun.com/dtd/ejb-jar_1_1.dtd">

<ejb-jar>

�� <enterprise-beans> 7

�� <session>

�� <ejb-name>sqlejbbean</ejb-name>

�� <home>sqlhome</home> 8

�� <remote>sqlremote</remote>

�� <ejb-class>sqlejbbean</ejb-class>

�� <session-type>Stateless</session-type> 9

�� <transaction-type>Container</transaction-type>

�� </session>

�� </enterprise-beans> 0

</ejb-jar>

//weblogic-ejb-jar.xml

<?xml version="1.0"?>

<!DOCTYPE weblogic-ejb-jar PUBLIC 2

"-//BEA Systems, Inc.//DTD WebLogic 7.0.0 EJB//EN"

"http://www.bea.com.servers/wls700/dtd/weblogic-ejb-jar.dtd">

<weblogic-ejb-jar> 3

� <weblogic-enterprise-bean>

�� <ejb-name>sqlejbbean</ejb-name>

�� <jndi-name>sqlejbJndi</jndi-name> 4

� </weblogic-enterprise-bean>

</weblogic-ejb-jar>

Now, revert back to c:\sam folder.

Create the jar file as follows:

sam>jar� cf�� sql.jar�� *.class�� META-INF\*.xml 6

This command will create sql.jar.

The next step is to create sql1.jar for deployment in weblogic server.

sam>java�� weblogic.ejbc sql.jar sql1.jar 7

This will create sql1.jar.� We may get some warning messages, which can be ignored.� Finally, we get the message ?ejbc successful?.

Now copy sql1.jar to the following folder:

d:\bea\user_projects\mydomain\Applications Start weblogic server by the following procedure: 8

Startmenu->programs->

bea weblogic platform->user projects->mydomain->startserver

Give�� username:� system 9

password:� administrator��

Wait till you get the message: ?started for Running mode?. �Minimize this window.� That completes the job of deployment in ejb server. �We should now create a console-mode client for the ejbean

// sqlConsoleClient.java 0

import java.ejb.*;

import java.rmi.*;

import javax.rmi.*; 1

import javax.naming.*;

import java.io.*;

import java.util.*; 2

public class sqlConsoleClient

{

�� public static void main(String args[]) 3

�� {

�� try

�� { 4

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

�� props.put

�� (Context.INITIAL_CONTEXT_FACTORY, 5

�� "weblogic.jndi.WLInitialContextFactory");

�� String url="t3://127.0.0.1:7001";

�� props.put(Context.PROVIDER_URL,url); 6

�� Context context=new InitialContext(props);

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

�� sqlhome home=(sqlhome)context.lookup("sqlejbJndi"); 7

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

�� sqlremote remote=home.create();

System.out.println("remote ok.."); 8

�� a=remote.showdata(s);

�� System.out.println(a);

�� }catch(Exception e1) 9

�� {System.out.println(" "+e1);}

� }

� catch(Exception e1) 0

�� {System.out.println(??+e1);}

� }

} 1

Now compile the client file:

C:\sam>javac sqlConsoleClient.java 2

Let us now run the client program:

>java� sqlConsoleClient�� ?select * from table1?

We will get a few names and numbers.We now proceed to create the jsp file . 3

// sqljspclient.jsp

<html>

<body> 4

<%@� page� import=?javax.ejb.*?�� %>

<%@� page� import=?java.rmi.*?�� %>

<%@� page� import=?javax.rmi.*?�� %> 5

<%@� page� import=?javax.naming.*?�� %>

<%@� page� import=?java.util.*?�� %>

<%@� page� import=?java.io.*?�� %> 6

String� sql= request.getParameter(?text1?);

Out.println(?please wait?); 7

Properties�� props=new Properties();

�� props.put

�� (Context.INITIAL_CONTEXT_FACTORY, 8

�� "weblogic.jndi.WLInitialContextFactory");

�� String url="t3://127.0.0.1:7001";

�� props.put(Context.PROVIDER_URL,url); 9

�� Context context=new InitialContext(props);

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

�� sqlhome home=(sqlhome)context.lookup("sqlejbJndi"); 0

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

�� sqlremote remote=home.create();

System.out.println("remote ok.."); 1

�� a=remote.showdata(s);

�� out.println(a);

� %> 2

</body>

</html>

Create the corresponding html file to invoke the above jsp.

// sqljspclient.htm

<html> 4

<body>

<form�� method=post�

�� action=?sqljspclient.jsp? /> 5

sql

<input�� type=text�� name=?text1?� size=60>

<input�� type=submit> 6

</form>

</body> 7

</html>

We have installed tomcat3.2 in e: drive. �Copy sqljspclient.jsp &� sqljspclient.htm to e:\tomcat\webapps\root.

To start the tomcat server, cd to 8

�e:\tomcat\bin>set JAVA_HOME=D:\JDK1.4.2

>SET CLASSPATH=%CLASSPATH%;c:\sam;

d:\bea\weblogic700\server\lib\weblogic.jar 9

>startup

This will start the webserver. Start the browser and type the URL as:?http://localhost:8080/sqljspclient.htm?.� We get a form.� Type the sql and submit.� We get the correct result (tested and found ok).� Thus, we have created a stateless session EJB, tested it in console mode and also as a jsp deployed in tomcat3.2. �We now proceed to expose our ejb as an XML-WebService, using AXIS by two methods:

as *.jws (known as Drop-in Deployment).( part-3)
by using wsdd file etc.(part-4)

�The next article discusses these aspects in detail. 0

Continued in axis2c.htm Visit �http://in.geocities.com/rsramsam

WEBSERVICE USING APACHE AXIS TUTORIAL-2 UNDERSTANDING APACHE AXIS (part-2)

WEBSERVICE USING APACHE AXIS TUTORIAL-2 UNDERSTANDING APACHE AXIS (part-2)

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