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From "Stefan Zoerner (JIRA)" <directory-...@incubator.apache.org>
Subject [jira] Created: (DIREVE-227) Fetching the schema fails on some LDAP clients
Date Wed, 17 Aug 2005 12:03:54 GMT
Fetching the schema fails on some LDAP clients
----------------------------------------------

         Key: DIREVE-227
         URL: http://issues.apache.org/jira/browse/DIREVE-227
     Project: Directory Server
        Type: Bug
    Versions: 0.9.2    
    Reporter: Stefan Zoerner
 Assigned to: Alex Karasulu 
    Priority: Minor


Fetching the schema fails on some LDAP clients I tried. Some others are able to retrieve a
subset of the schema. E.g. Softerra LDAP Adminstrator displays some object classes, some are
missing (for instance top, inetOrgPerson). Therefore the creation of entries by some GUI clients
may not work (e.g. if the client provides support by displaying required and optional attributes).
This is especially true for Softerra.

I am not 100% sure, but I assume the problem lies in in the textual respresentation of schema
elements in the schema subentry. Here is an example:

Objectclass "top" looks to client like this for Apache DS:
( 2.5.6.0 NAME 'top' DESC 'top of the superclass chain'  STRUCTURAL MUST objectClass MAY 
)
and like this for another server I checked:
( 2.5.6.0 NAME 'top' DESC 'Standard LDAP objectclass' ABSTRACT MUST objectClass X-ORIGIN 'RFC
2256' )

I guess some tools have problems with the empty "MAY". The same is probably true for empty
"MUST" parts. Therfore inetOrgPerson does not appear in Softerra, but person does (person
has both MAY and MUST attributes).

The problen does not only occur in some GUI clients, but also in JNDI code, if you use the
schema functionality (for many of your users this may be more critical). You find a JNDI example
attached to this issue report which crashes an Apache DS but runs without problems on other
solutions. Maybe the JNDI parser has the same problem with empty MUSTs and MAYs. Problem is
comparable, e.g. fetching "top" causes an exception, "person" does not.

Btw.: Within the JXplorer client there are no problems.  

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