import javax.naming.*;
import javax.naming.directory.*;
import java.util.Hashtable;
 
/**
 * Demonstrates how to create an initial context to an LDAP server
 * using simple authentication.
 */
 
class Simple {
    public static void main(String[] args) {
    	Hashtable authEnv = new Hashtable(11);
    	String userName = "johnlennon";
    	String passWord = "sushi974";
    	String base = "ou=People,dc=example,dc=com";
    	String dn = "uid=" + userName + "," + base;
    	String ldapURL = "ldap://ldap.example.com:389";
 
    	authEnv.put(Context.INITIAL_CONTEXT_FACTORY,"com.sun.jndi.ldap.LdapCtxFactory");
   		authEnv.put(Context.PROVIDER_URL, ldapURL);
   		authEnv.put(Context.SECURITY_AUTHENTICATION, "simple");
   		authEnv.put(Context.SECURITY_PRINCIPAL, dn);
   		authEnv.put(Context.SECURITY_CREDENTIALS, passWord);
 
    	try {
    		DirContext authContext = new InitialDirContext(authEnv);
    		System.out.println("Authentication Success!");
    	} catch (AuthenticationException authEx) {
    		System.out.println("Authentication failed!");
 
    	} catch (NamingException namEx) {
    		System.out.println("Something went wrong!");
    		namEx.printStackTrace();
    	}
    }
}