Query OpenLDAP from Java using JNDI

Description: Uses Java Naming and Directory (JNDI) to connect to OpenLDAP in a Java application and query entries.

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import java.util.Properties; import javax.naming.Context; import javax.naming.NamingEnumeration; import javax.naming.NamingException; import javax.naming.directory.Attributes; import javax.naming.directory.InitialDirContext; import javax.naming.directory.SearchControls;   /** * Connect to OpenLDAP and query the directory using Java Naming * and Directory (JNDI). */ public class DirectoryConnection {     public static void main(String[] args) throws NamingException     {         //LDAP information         String ldapServerName = "localhost";         String ldapProviderURL = "ldap://" + ldapServerName + ":389";         String username = "cn=Manager,dc=my-domain,dc=com";         String password = "secret";           //Set LDAP information in a properties object         Properties properties = new Properties();         properties.put(Context.SECURITY_AUTHENTICATION, "simple");         properties.put(Context.INITIAL_CONTEXT_FACTORY, "com.sun.jndi.ldap.LdapCtxFactory");         properties.put(Context.PROVIDER_URL, ldapProviderURL);         properties.put(Context.SECURITY_PRINCIPAL, username);         properties.put(Context.SECURITY_CREDENTIALS, password);           //Initializing LDAP connection         InitialDirContext ctx = new InitialDirContext(properties);           //Create the search controls         SearchControls searchCtls = new SearchControls();           //Specify the attributes to return         String[] returnAttrs = {"cn", "sn", "uid"};         searchCtls.setReturningAttributes(returnAttrs);           //Specifiy the search scope         searchCtls.setSearchScope(SearchControls.SUBTREE_SCOPE);           //Specifiy the LDAP search filter         String searchFilter = "(&(uid=*))";           //Specify the base foe the search         String searchBase = "ou=people,dc=my-domain,dc=com";           //initialize counter to total the results         int totalResults = 0;           //Search for objects using the filter         NamingEnumeration answer = ctx.search(searchBase, searchFilter, searchCtls);           //Loop through the search results         while(answer.hasMoreElements())         {             javax.naming.directory.SearchResult sr = (javax.naming.directory.SearchResult) answer.next();             totalResults++;             System.out.println(">>>" + sr.getName());             Attributes attrs = sr.getAttributes();               //Print out some of the attributes             if(attrs != null)             {                 System.out.println(attrs.get("sn"));                 System.out.println(attrs.get("cn"));             }         }           System.out.println(totalResults);     } }