Need help in retrieving attributes from LDAP using JNDI

Question

I am trying to retrieve attributes from LDAP using JNDI, but I'm getting the following error when I try to run my Java program.
Exception in thread "main" java.lang.NoClassDefFoundError: javax/naming/NamingException
I have all the jar files in my classpath: j2ee.jar, fscontext.jar and providerutil.jar. The interesting thing is that it gets compiled just fine but gives an error at run-time.
Could anyone tell me why I'm getting this error? Thanks!
Here's my code:
import javax.naming.*;
import javax.naming.directory.*;
import java.util.*;
import java.io.*;
class Getattr {
public static void main(String[] args) {     
// Identify service provider to use     
Hashtable env = new Hashtable(11);     
env.put(Context.INITIAL_CONTEXT_FACTORY, "com.sun.jndi.ldap.LdapCtxFactory");      
// user     info
String userName = "username";     
String password = "password";          
// LDAP server specific information     
String host = "ldaphostname";     
String port = "portnumber";     
String basedn = "o=organization,c=country";     
String userdn = "cn=" + userName + "," + basedn;          
env.put(Context.PROVIDER_URL, "ldap://" + host + ":" + port + "/" + basedn);     
env.put(Context.SECURITY_PRINCIPAL, userdn);     
env.put(Context.SECURITY_CREDENTIALS, password);     
try {          
System.setErr(new PrintStream(new FileOutputStream(new File("data.txt"))));     
// Create the initial directory context     
DirContext ctx = new InitialDirContext(env);          
// Ask for all attributes of the object      
Attributes attrs = ctx.getAttributes("cn=" + userName);          
NamingEnumeration ne = attrs.getAll();                    
while(ne.hasMore()){                         
Attribute attr = (Attribute) ne.next();                                   
if(attr.size() > 1){               
for(Enumeration e = attr.getAll(); e.hasMoreElements() ;) {                                       
System.err.println(attr.getID() + ": " + e.nextElement());                     
} else {
     System.err.println(attr.getID() + ": " + attr.get());
// Close the context when we're done     
ctx.close();     
} catch(javax.naming.NamingException ne) {
     System.err.println("Naming Exception: " + ne);     
} catch(IOException ioe) {
     System.err.println("IO Exception: " + ioe);     

Answer 1

That doesn't work either. It seems its not finding the NamingException class in any of the jar files. I don't know why? Any clues?