Oracle SQL Developer && LDAP Connection

[Quoted] [Quoted] I've configured openldap to store information from tnsnames.ora. See http://oracle-cookies.blogspot.com/2007/01/get-tnsnamesora-from-openldap.html for details.
[Quoted] [Quoted] Then I configured Naming Methods via netca as follows:

olimpico_work ~ # cat /usr/local/oracle/app/oracle/product/10.2.0/ network/admin/sqlnet.ora

1. sqlnet.ora Network Configuration File: /usr/local/oracle/app/ oracle/product/10.2.0/network/admin/sqlnet.ora
2. Generated by Oracle configuration tools.

NAMES.DIRECTORY_PATH= (LDAP, TNSNAMES) olimpico_work ~ #

This is my ldap.ora file:

olimpico_work ~ # cat /usr/local/oracle/app/oracle/product/10.2.0/ network/admin/ldap.ora
DIRECTORY_SERVERS = (develop2:389:636)
DEFAULT_ADMIN_CONTEXT = "dc=itfits,dc=biz" DIRECTORY_SERVER_TYPE = OID
olimpico_work ~ #

As shown below tnsping works fine:

olimpico_work ~ # tnsping sumtel_fake

TNS Ping Utility for Linux: Version 10.2.0.1.0 - Production on 30- SEP-2008 11:58:48 Copyright (c) 1997, 2005, Oracle. All rights reserved.

Used parameter files:
/usr/local/oracle/app/oracle/product/10.2.0/network/admin/sqlnet.ora

Used LDAP adapter to resolve the alias
Attempting to contact (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)
(HOST=sumtel.clients.net)(PORT=1521))
(CONNECT_DATA=(SERVICE_NAME=ORANGE)))

OK (690 msec)
olimpico_work ~ #

The problem lies in that I can't create LDAP connection in Oracle SQL Developer.
Doc says that sql developer should load entries from ldap.ora (http:// www.oracle.com/technology/oramag/oracle/08-may/o38sql.html). However, I found that it even doesn't read ldap.ora file (I'm sure since I traced sqldeveloper via "strace" utility).

How to get it work?
Any ideas?

Thank you beforehand!

P.S.
I'm using the latest Gentoo Linux with kernel 2.6.22. The version of Oracle installed is 10.2.0.1.0. The version of Oracle SQL developer is 1.5.1.54.40. Received on Thu Oct 02 2008 - 08:26:26 CEST