How to create and add a new user to existing group in Active Directory via Java client

I am a beginner and I try to implement client in Java for Active Directory. I would like to create and add a new user to AD. So far, I have written the following code:

import java.util.Hashtable;
import javax.naming.Context;
import javax.naming.NamingException;
import javax.naming.directory.Attribute;
import javax.naming.directory.Attributes;
import javax.naming.directory.BasicAttribute;
import javax.naming.directory.BasicAttributes;
import javax.naming.ldap.InitialLdapContext;
import javax.naming.ldap.LdapContext;

public class NewUser {

    public static void main(String[] args) {
        NewUser user = new NewUser("aaa", "bbb", "ccc", "mypass", "orgunit");
        try {
            System.out.print(user.addUser());
        } catch (NamingException e) {
            e.printStackTrace();
        }
    }

    private static final String DOMAIN_NAME = "xyz.xyz";
    private static final String DOMAIN_ROOT = "abc.xyz.xyz"; // ?
    private static final String ADMIN_NAME = "CN=Administrator,CN=Users,DC=xyz,DC=xyz";
    private static final String ADMIN_PASS = "xxxxxxx";
    private static final String DOMAIN_URL = "ldap://xxx.xxx.xx.xx:389";


    private String userName, firstName, lastName, password, organisationUnit;
    private LdapContext context;

    public NewUser(String userName, String firstName, String lastName,
                   String password, String organisationUnit) {

        this.userName = userName;
        this.firstName = firstName;
        this.lastName = lastName;
        this.password = password;
        this.organisationUnit = organisationUnit;

        Hashtable<String, String> env = new Hashtable<String, String>();

        env.put(Context.INITIAL_CONTEXT_FACTORY, "com.sun.jndi.ldap.LdapCtxFactory");

        // set security credentials, note using simple cleartext authentication
        env.put(Context.SECURITY_AUTHENTICATION, "simple");
        env.put(Context.SECURITY_PRINCIPAL, ADMIN_NAME);
        env.put(Context.SECURITY_CREDENTIALS, ADMIN_PASS);

        // connect to my domain controller
        env.put(Context.PROVIDER_URL, DOMAIN_URL);
        try {
            this.context = new InitialLdapContext(env, null);
        } catch (NamingException e) {
            System.err.println("Problem creating object: ");
            e.printStackTrace();
        }
    }

    public boolean addUser() throws NamingException {

        // Create a container set of attributes
        Attributes container = new BasicAttributes();

        // Create the objectclass to add
        Attribute objClasses = new BasicAttribute("objectClass");
        objClasses.add("top");
        objClasses.add("person");
        objClasses.add("organizationalPerson");
        objClasses.add("user");

        // Assign the username, first name, and last name
        String cnValue = new StringBuffer(firstName).append(" ").append(lastName).toString();
        Attribute cn = new BasicAttribute("cn", cnValue);
        Attribute sAMAccountName = new BasicAttribute("sAMAccountName", userName);
        Attribute principalName = new BasicAttribute("userPrincipalName", userName+ "@" + DOMAIN_NAME);
        Attribute givenName = new BasicAttribute("givenName", firstName);
        Attribute sn = new BasicAttribute("sn", lastName);
        Attribute uid = new BasicAttribute("uid", userName);

        // Add password
        Attribute userPassword = new BasicAttribute("userpassword", password);

        // Add these to the container
        container.put(objClasses);
        container.put(sAMAccountName);
        container.put(principalName);
        container.put(cn);
        container.put(sn);
        container.put(givenName);
        container.put(uid);
        container.put(userPassword);

        // Create the entry
        try {
            context.createSubcontext(getUserDN(cnValue, organisationUnit), container);
            return true;
        } catch (Exception e) {
            e.printStackTrace();
            return false;
        }
    }

    private static String getUserDN(String aUsername, String aOU) {
        return "cn=" + aUsername + ",ou=" + aOU + "," + DOMAIN_ROOT;
    }
}

And there is the following error:

javax.naming.InvalidNameException: Invalid name: cn=bbb ccc,ou=orgunit,abc.xyz.xyz; remaining name 'cn=bbb ccc,ou=orgunit,abc.xyz.xyz' at javax.naming.ldap.Rfc2253Parser.doParse(Rfc2253Parser.java:86) at javax.naming.ldap.Rfc2253Parser.parseDn(Rfc2253Parser.java:49) false at javax.naming.ldap.LdapName.parse(LdapName.java:772) at javax.naming.ldap.LdapName.(LdapName.java:108) at com.sun.jndi.ldap.LdapCtx.addRdnAttributes(LdapCtx.java:902) at com.sun.jndi.ldap.LdapCtx.c_createSubcontext(LdapCtx.java:783) at com.sun.jndi.toolkit.ctx.ComponentDirContext.p_createSubcontext(ComponentDirContext.java:319) at com.sun.jndi.toolkit.ctx.PartialCompositeDirContext.createSubcontext(PartialCompositeDirContext.java:248) at com.sun.jndi.toolkit.ctx.PartialCompositeDirContext.createSubcontext(PartialCompositeDirContext.java:236) at javax.naming.directory.InitialDirContext.createSubcontext(InitialDirContext.java:178) at NewUser.addUser(NewUser.java:98) at NewUser.main(NewUser.java:17) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at com.intellij.rt.execution.application.AppMain.main(AppMain.java:120)

Anyone can help me? I have spent long time ti fix it but it still does not work.

Thank you in advance