Failed Running Interest Example in JBoss

Question

Hi there,
I try to create jar for this example using ANT, but the following mesg appears: How should i overcome this?
-------- Error building Interest example
D:\RereferenceJBoss\documentation-example\examples\build>ant intro-interest-jar
Buildfile: build.xml
validate-servlet:
BUILD FAILED
D:\RereferenceJBoss\documentation-example\examples\build\build.xml:36: Could not create task of type: path. Common solutions are to use taskdef to declare your task, or, if this is an optional task, to put the optional.jar in the lib directory of your ant instalation <ANT_HOME>.

Answer 1

This error appears if the jndi initial context is not being set properly. You can either set the initial context by passing a jndi.properties file containing the following:
java.naming.factory.initial=org.jnp.interfaces.NamingContextFactory
java.naming.provider.url=jnp://localhost:1099
java.naming.factory.url.pkgs=org.jboss.naming:org.jnp.interfaces
or you can also pass these parameters directly in the InterestClient itself by adding these lines to the starting of the class i.e before the try statement
* Created on Nov 26, 2003
* To change the template for this generated file go to
* Window>Preferences>Java>Code Generation>Code and Comments
import javax.rmi.PortableRemoteObject;
import javax.naming.*;
import src.*;
//import java.util.*;
* @author mazumdar
* To change the template for this generated type comment go to
* Window>Preferences>Java>Code Generation>Code and Comments
public class InterestClient {
     public static void main(String[] args) {
          try{
               System.setProperty(Context.INITIAL_CONTEXT_FACTORY,"org.jnp.interfaces.NamingContextFactory");
               System.setProperty(Context.PROVIDER_URL,"jnp://localhost:1099");
               System.setProperty("java.naming.factory.url.pkgs","org.jboss.naming:org.jnp.interfaces");
               InitialContext jndiContext = new InitialContext();
               System.out.println("Got Context");
               Object ref = jndiContext.lookup("src/Interest");
               System.out.println("Got Reference");
               InterestHome home = (InterestHome)PortableRemoteObject.narrow(ref,InterestHome.class);
               Interest interest = home.create();
               System.out.println("Interest on 1000 units, at 10% per period,for 2 years is: ");
               System.out.println(interest.calculateCompoundInterest(1000,0.10,2));
          catch(Exception e){
               System.out.println(e.toString());
The above is the complete source file of the InterestClient which I have successfully run on JBoss-3.2.2 and ant-1.6.
Just make sure that all the required client jars of JBoss are passed in the classpath during compiling and running the InterestClient using ant.
Hope this works answers your question. Happy coding....