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Issue with too-slow LDAP queries

John Gordon
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I wrote some java code to do LDAP queries. It runs quite slowly and I don't
know why.

On a query that returns about 275K entries my code takes about 50 minutes
to complete, where the Sun "ldapsearch" tool takes about 8 minutes.

Is this expected? Does the Java LDAP implementation just have that much

I'd appreciate any comments on my code. Thanks!

import java.util.*;
import java.text.*;
import javax.naming.*;
import javax.naming.ldap.*;
import org.jdom.*;
import org.jdom.input.*;
import org.jdom.output.*;

public class ldapSearch
public static void main (String[] args)
int ldapRecords = 0; // total number of ldap records read
LdapContext m_Ctx = null;
Hashtable<String, String> m_env = new Hashtable<String, String>();
javax.naming.ldap.SortControl sctl = null;
javax.naming.ldap.PagedResultsControl pctl = null;
SearchControls constraints = null;
NamingEnumeration results = null;

m_env.put(Context.INITIAL_CONTEXT_FACTORY, "com.sun.jndi.ldap.LdapCtxFactory");
m_env.put(Context.PROVIDER_URL, "ldaps://,dc=mycompany,dc=com");
m_env.put(Context.SECURITY_PRINCIPAL, "cn=Automated LDAP Account,ou=specials,dc=mycompany,dc=com");
m_env.put(Context.SECURITY_CREDENTIALS, "sekrit");

m_Ctx = new InitialLdapContext(m_env, null);

if(m_Ctx != null)
byte[] cookie = null;

sctl = new javax.naming.ldap.SortControl(new String[]{"cn"}, Control.CRITICAL);
pctl = new javax.naming.ldap.PagedResultsControl(100, Control.CRITICAL);
String[] returnedAttributes = { "cn", "ssn", "firstName", "lastName",
"generationQualifier", "someField", "someOtherField" };
constraints = new SearchControls();
constraints.setSearchScope(SearchControls.SUBTREE_ SCOPE);
constraints.setReturningAttributes(returnedAttribu tes);

m_Ctx.setRequestControls(new Control[]{sctl, pctl});
results ="", "uid=*", constraints);

if (results != null)
while (results.hasMoreElements())
SearchResult sr = (SearchResult) results.nextElement();

if(sr != null)
Attributes attrib = sr.getAttributes();
if(attrib != null)

// get the response controls to our search
Control[] controls = m_Ctx.getResponseControls();
if (controls != null)
for(int i = 0; i < controls.length; i++)
if(controls[i] instanceof javax.naming.ldap.PagedResultsResponseControl)
javax.naming.ldap.PagedResultsResponseControl prrc = (javax.naming.ldap.PagedResultsResponseControl) controls[i];
cookie = prrc.getCookie(); // cookie will be null when no pages remain, otherwise it will point to the next page of results

// re-create the page control so the next call to m_Ctx.setRequestControls() will get the next page in the result set
pctl = new javax.naming.ldap.PagedResultsControl(100, cookie, Control.CRITICAL);

} while ((cookie != null) && (cookie.length != 0));

System.out.println(ldapRecords + " LDAP records read.");


catch (IOException e) { System.out.println("Could not create sort control for LDAP search"); }
catch (NamingException e) { System.out.println("Error communicating with LDAP server"); }



John Gordon A is for Amy, who fell down the stairs Removed) B is for Basil, assaulted by bears
-- Edward Gorey, "The Gashlycrumb Tinies"

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