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LDAP and NamingEnumeration

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This following my code search & get the last name and first name & email address of the user from Active Directory. Now I found onething that if any of user last name is empty in Active Directory, this code fails and misorder the last name with first name i.e If I have two users : John(which doesn't have last name) and Ed Lin then I see John Lin. Why???
// throw up if not already authenticated
String server = (String) cookies.ge(Constants.SERVER);
String user = (String)cookies.get(Constants.USER);
String password = (String)cookies.get(Constants.PASSWORD);
password = decrypt(password);
String provider = "ldap://" + server + ":389";
Hashtable env = new Hashtable();
/* Specify host and port to use for directory service */
env.put(Context.PROVIDER_URL, provider);
env.put(Context.INITIAL_CONTEXT_FACTORY, "com.sun.jndi.ldap.LdapCtxFactory");
/* specify authentication information */
env.put(Context.SECURITY_AUTHENTICATION, "simple");
env.put(Context.SECURITY_PRINCIPAL, user);
env.put(Context.SECURITY_CREDENTIALS, password);
DirContext ctx = new InitialDirContext(env);
if (ctx != null)
SearchControls constraints = new SearchControls();
NamingEnumeration results = ctx.search(book, "(cn=*)", constraints);
while (results.hasMoreElements())
SearchResult si = (SearchResult)results.next();
Attributes attrs = si.getAttributes();
if (attrs != null)
// we have some attributes for this object
NamingEnumeration ae = attrs.getAll();
System.out.println("The ae is ---> " + ae);
while (ae.hasMoreElements())
Attribute attr = (Attribute)ae.next();
String attrId = attr.getID();
// this object has the right attribute
// get all the values of this attribute
Enumeration vals = attr.getAll();
while (vals.hasMoreElements())
String emailaddr = (String)vals.nextElement();
catch(Exception e){}
//return temp;
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