public class LDAPTest {
public static void main(String[] args) throws NamingException {
    final String ldapAdServer = "ldap://ad.your-server.com:8080";
    // final String ldapSearchBase =
    // "dc=ad,dc=my-domain,dc=com,cn=directory manager";
    final String ldapSearchBase = "cn=directory manager";
    final String ldapUsername = "myLdapUsername";
    final String ldapPassword = "myLdapPassword";
    Hashtable<String, Object> env = new Hashtable<String, Object>();
    env.put(Context.SECURITY_AUTHENTICATION, "simple");
    env.put(Context.SECURITY_PRINCIPAL, ldapUsername);
    env.put(Context.SECURITY_CREDENTIALS, ldapPassword);
    env.put(Context.INITIAL_CONTEXT_FACTORY,
            "com.sun.jndi.ldap.LdapCtxFactory");
    env.put(Context.PROVIDER_URL, ldapAdServer);
    LdapContext ctx = new InitialLdapContext(env, null);
    String uid = "abc123";
    String searchFilter = "(&(objectClass=group)(objectSid=" + uid + "))";
    SearchControls searchControls = new SearchControls();
    searchControls.setSearchScope(SearchControls.SUBTREE_SCOPE);
    NamingEnumeration<SearchResult> results = ctx.search(ldapSearchBase,
            searchFilter, searchControls);
}