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From Jeff MAURY <>
Subject Re: Toward 2.0...
Date Wed, 18 Mar 2009 09:06:59 GMT
If I correctly understood the need from the ADS point of view (and not from
a pure technology point of view Spring vs ....), what the ADS team is
looking for is a solution for configuring through an XML file with a simple
syntax a set of classes and assembling them in a simple way (JavaBeans
convention, no AOP, no IOC).
So why not use commons digester ( ? It
is being used by Tomcat for a long time ago now and seems to fill the
requirements ?


On Wed, Mar 18, 2009 at 2:20 AM, Howard Chu <> wrote:

> David Boreham wrote:
>> Graham Leggett wrote:
>>> That said, both Fedora and OpenLDAP use the DIT for config, so that
>>> may be an XML free option :)
>> FDS doesn't exactly use the DIT. We had the same argument that you're
>> having, in 1997 or so, and
>> decided to write an 'ldif back end' for the server, specifically for
>> config (there had been an earlier
>> flat-file back end that provided some inspiration and possibly some
>> code).
> Heh. Sounds like the same discussion we had in 2000, it took us a while to
> get out of the weeds of LDAPv3 before we could see it. ;)
>  This replaced the original
>> UMich text config file (which I believe OpenLDAP still used until
>> recently). So while the config
>> manifests as LDAP entries, and can be read/written over-the-wire, it is
>> stored in a text file as LDIF.
>> If it were in the primary database, you'd have a chicken/egg problem.
> Right. We wound up with an LDIF backend as well; it can still be configured
> as a primary database (but that would be stupid) but its main point is that
> it is so simple to configure (just needs a directory path to store its
> files) that its bootstrap can be hardcoded, thus giving us the initial egg.
> I also experimented with using back-ldap as the cn=config backing store;
> i.e., running a server with a configuration proxied from (and thus identical
> to) a separate server. But it's more reliable to just replicate the master's
> config to a local LDIF copy. There's no reason we couldn't provide hardcoded
> parameters for any other backend type as well, but back-ldif has the virtue
> of being human-readable/editable in case Something Went Wrong...
> --
>  -- Howard Chu
>  CTO, Symas Corp. 
>  Director, Highland Sun
>  Chief Architect, OpenLDAP

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