Return NamingEnumeration object from the webservice method.

Question

I am developing a webservice for creating a connection with LDAP and get user first name from LDAP. For this I developed the following webservice in netbeans 6.0 by using Glass Fish V2 server.
package san.exam;
import javax.jws.WebMethod;
import javax.jws.WebParam;
import javax.jws.WebService;
import javax.naming.*;
import javax.naming.directory.*;
import java.util.*;
@WebService()
public class LDAP {
@WebMethod
public NamingEnumeration getUser(@WebParam(name = "firstName") String firstName) throws Exception {
// TODO implement operation
Hashtable env = new Hashtable();
     env.put(Context.INITIAL_CONTEXT_FACTORY,"com.sun.jndi.ldap.LdapCtxFactory");
     env.put(Context.PROVIDER_URL, "ldap://chdsez89674d:389/");
env.put(Context.SECURITY_AUTHENTICATION,"simple");
     env.put(Context.SECURITY_PRINCIPAL,"cn=root"); // specify the username
env.put(Context.SECURITY_CREDENTIALS,"vicky123");
     // Create the initial context
     DirContext ctx = new InitialDirContext(env);     
     Attributes matchAttrs = new BasicAttributes(true); // ignore attribute name case
     matchAttrs.put(new BasicAttribute("uid", firstName));
NamingEnumeration answer = ctx.search("ou=white pages,dc=ibm",matchAttrs);
     ctx.close();
return answer;
We are not able deploy this webservice. I don�t know what the problem is. But we are able to make web service where we returned int or string or float and able to use this webservice by making webservice client.
I think in this case we are trying to return NamingEnumeration object so the problem has come. Has anyone solve this problem or tell me how to return the NamingEnumeration object in the webservice?
Any pointer regarding this problem is helpful for me.

Answer 1

If you want to transfer an object through RMI it should be Serializable. Add 'implements Serializable' to your class. That's it
import java.io.Serializable;
class TransferObject implements Serializable {
}