LDAP Connection/ Apache DS / Java

i wanted to make an easy LDAP Connection with using Apache DS and Java, wanted to learn and play a bit with authentification. However, when i start using the my jar file, i always get this error message:

Setting up LDAP connection ... 
LDAPException(resultCode=91 (connect error), errorMessage='An error occurred while attempting to resolve address 'ldap://localhost:10389':  
UnknownHostException(Der angegebene Host ist unbekannt (ldap://localhost:10389)), ldapSDKVersion=6.0.0, revision=524c20f3bbcc0d83fb56b9e136a2fd3a7f60437d')

My apache DS LDAP server looks like this:

enter image description here

My Java code:

package ldap.test;
import java.security.GeneralSecurityException;

import javax.net.SocketFactory;

import com.unboundid.ldap.sdk.BindRequest;
import com.unboundid.ldap.sdk.BindResult;
import com.unboundid.ldap.sdk.Filter;
import com.unboundid.ldap.sdk.LDAPConnection;
import com.unboundid.ldap.sdk.LDAPException;
import com.unboundid.ldap.sdk.LDAPSearchException;
import com.unboundid.ldap.sdk.ResultCode;
import com.unboundid.ldap.sdk.SearchRequest;
import com.unboundid.ldap.sdk.SearchResult;
import com.unboundid.ldap.sdk.SearchResultEntry;
import com.unboundid.ldap.sdk.SearchScope;
import com.unboundid.ldap.sdk.SimpleBindRequest;
import com.unboundid.util.ssl.SSLUtil;
import com.unboundid.util.ssl.TrustAllTrustManager;

public final class App2 {
    // hostname of the ldap instance
      public static final String HOSTNAME = "ldap://localhost:10389";
      
      // port of the ldap instance
      public static final int PORT = 10389;
      
      public static final void main(String[] args)
      {
        // lazy hack
        if ( args.length != 4 ) {
          System.out.println("One or more parameters are missing!");
          System.out.println("java -jar App2.jar $cn $sn $employeenumber $password");
          System.out.println("Example: java -jar App2.jar Max Mustermann 1 1");
          System.exit(1);
        }

        // Use no key manager, and trust all certificates. This should not be used in non-trivial code!
        SSLUtil sslUtil = new SSLUtil(null, new TrustAllTrustManager());

        SocketFactory socketFactory;
        LDAPConnection ldapConnection = null;
        try {
          // Create the socket factory that will be used to make a secure
          // connection to the server.
          socketFactory = sslUtil.createSSLSocketFactory();
          System.out.print("Setting up LDAP connection ... ");
          ldapConnection = new LDAPConnection(socketFactory, HOSTNAME, PORT);
          System.out.println("done!");
        }
        catch ( LDAPException ldapException ) {
          System.err.println(ldapException);
          System.exit(ldapException.getResultCode().intValue());
        }
        catch ( GeneralSecurityException exception ) {
          System.err.println(exception);
          System.exit(1);
        }

        // LDAP bindrequest and actual bind for DN search
        System.out.print("Search DN for user with employeeNumber: " + args[2] + " ... ");
        BindRequest ldapBind = new SimpleBindRequest(args[0], args[1]);
        try {
          // bind with technical user and password and search for DN
          ldapConnection.bind(ldapBind);
          String employeeNumber = args[2];
          String userPassword = args[3];
          Filter ldapFilter = Filter.createANDFilter(Filter.createEqualityFilter("number", employeeNumber));
          SearchRequest searchReq = new SearchRequest("ou=users,o=Beispiel", SearchScope.SUB, ldapFilter, "dn");
          SearchResult searchResult;
          String foundDN = "none";
          try
          {
            searchResult = ldapConnection.search(searchReq);
            System.out.println("done!");
            for ( SearchResultEntry entry : searchResult.getSearchEntries() )
            {
              foundDN = entry.getDN();
            }
          }
          catch ( LDAPSearchException lse )
          {
            System.out.println("... error!");
            // The search failed for some reason
            searchResult = lse.getSearchResult();
            ResultCode resultCode = lse.getResultCode();
            System.out.println("Resultcode: " + resultCode);
            String errorMessageFromServer = lse.getDiagnosticMessage();
            System.out.println("Error message from server: " + errorMessageFromServer);
          }

          // now check for the foundDN if the given password is correct
          if ( !foundDN.equals("none") ) {
            System.out.println("Found DN for user with EmployeeNumber: " + employeeNumber + " => " + foundDN);
            System.out.println("Now checking if password for user is correct!");
            BindRequest userBindReq = new SimpleBindRequest(foundDN, userPassword);
            BindResult userBindRes = ldapConnection.bind(userBindReq);
            System.out.println("Result: " + userBindRes);
          }
          else {
            System.out.println("No DN found for user with EmployeeNumber: " + employeeNumber);
          }

        }
        catch ( LDAPException ldapException ) {
          System.err.println(ldapException);
          System.exit(ldapException.getResultCode().intValue());
        }
        finally {
          // Close ldap connection
          ldapConnection.close();
        }
      }
    }

No idea why i cant connect to the server...

-----Edit--------

When i change the HOSTNAME to localhost, i get the following error message:

Setting up LDAP connection ... LDAPException(resultCode=91 (connect error),
errorMessage='An error occurred while attempting to connect to server localhost:10389:  IOException(LDAPException(resultCode=91 (connect error), 
errorMessage='An error occurred while attempting to establish a connection to server localhost/127.0.0.1:10389:  SSLException(Unsupported or unrecognized SSL message), 
ldapSDKVersion=6.0.0, revision=524c20f3bbcc0d83fb56b9e136a2fd3a7f60437d'))') 

Well the good thing is that he can find localhost, but he cant connect to the server