Hi,

Sorry, I am trying to help out a colleague with this problem.  Here's
a (hopefully) more complete snippet which I got:

try
{ // outer try
System.out.println("Connecting to [" + dsType + "] server: [" + dsHost
+ ":" + ("" + dsPort) + "]");
ld.connect(dsHost, dsPort);

LDAPSearchResults results = ld.search(baseDN, searchScope,
searchFilter, getAttributes, false);

if (!results.hasMoreElements())
{
return "";
}

    while (results.hasMoreElements())                            // loop, looking for all
returned entities
        {
        LDAPEntry findEntry = null;
        try
        { // inner try
        findEntry = results.next();                                // get next entity returned by
LDAP server
        LDAPAttribute attribute = findEntry.getAttribute(dsUserAtr);
Enumeration enumValues = attribute.getStringValues();                    // put
attribute values into an Enumeration
        if (!enumValues.hasMoreElements())
            {
            System.out.println("** ERROR **: enumValues.hasMoreElements() is
false ==> found match to certificate Subject and found desired
attribute, but attribute had no values...");
            System.out.println("** ERROR **:    -> So, will now return
indication that authentication failed...");
            return "";
            }
        returnString = (String)enumValues.nextElement();                    // move 1st
attribute value into returnString
        numMatches++;                                    // increment count of matches for this search
        System.out.println("found match, returned string #(" + numMatches +
") = [" + returnString + "]");
        } // end inner try
        catch (LDAPReferralException e)
            {
            System.out.println("LDAP search failed ...");
            System.out.println("LDAPReferralException = [" + e + "]"); <<--We
think Nullpointerexception being thrown here...
            return "";
            }
        } // end while
        System.out.println("LDAP search found [" + numMatches + "]
matches");
        System.out.println("Disconnecting from LDAP server");
        ld.disconnect();
        } // end outer try
        catch (LDAPException e)
            {
            System.out.println("** ERROR **: Failed ...");
            System.out.println("** ERROR **:   -> LDAPException = [" + e +
"]");
            return "";
            }