Pb with LDAP

Hi,
 
I'am experiencing pbs with LDAP (using Jahia 4.1.0_01 and Lotus LDAP) :
    the LDAP groups are located at the root of the server : I mean there is no Base DN to locate my groups
    --> this generate exceptions of type ArrayOutOfBoundException and create problems when looking for groups
 
After looking to the java code, it appears that the Base DN cannot be null or empty...
--> does a solution exist without touching my LDAP groups ?
 
 
Another point is the ability to create LDAP filter when using Jahia : is this feature foreseen ?
 
 
Kind regards,
 
Arnaud.