[DAS] LDAS/DasClient problems

[Brian Gilman]

Hello all,


	Do we have a new DTD for this spec?? It looks like our client will
not be able to connect to any new LDAS backended server with the new
changes in place. I'm thinking of good ideas ways of being able to connect
to any DAS server but I'm finding myself in spec hell right now. 

	Here's the current thoughts:

	1) Look at HTTP header for das version 
	2) Get instance of builder object for the XML handler instances
	3) Stream XML into this handler
	4) Pass objects to client 


	We use a validating parser on the backend to make sure the data
coming down the wire is valid. This is the reason our group keeps finding
little niggly bugs in the servers different groups have implemented.
Hopefully we can keep people "true" to the spec. Anyway, suggestions are
welcome as to how to do this sort of thing. 

				Best, 

					-B

-----------------------
Brian Gilman <gilmanb@genome.wi.mit.edu>
Sr. Software Engineer MIT/Whitehead Inst. Center for Genome Research
One Kendall Square, Bldg. 300 / Cambridge, MA 02139-1561 USA
phone +1 617  252 1069 / fax +1 617 252 1902


On Tue, 5 Feb 2002, Thomas Down wrote:

> On Fri, Feb 01, 2002 at 04:06:57PM -0800, Mr Dmitriy Ryaboy wrote:
> > Hi everyone,
> > I've been trying to set up a DAS annotation server at
> > http://zilla.lbl.gov/cgi-bin/das , but I keep running
> > into some problems..  I installed LDAS following
> > Lincoln Stein's excellent instructions, and using
> > slightly different test data (see below, along with
> > the .conf file).  Ldasdump works, http query work.  
> > When I try to view the annotation on Ensembl's
> > DasClient, however, I get the following error:
> 
> Hi...
> 
> I've added a workaround to the BioJava DAS library which
> now allows it to communicate with the current LDAS release.  You can
> download a new DasClient build including this code from:
> 
>    http://www.biojava.org/download/das-client/
> 
> (Make sure you get the latest build -- currently 20020205).
> 
> There are still a couple of other issues:
> 
>   - When the client requests a stylesheet from your server,
>     the HTTP connection gets dropped (without even an error
>     message).  This suggests some kind of server error -- not
>     sure if this is an LDAS bug or a local misconfiguration.
>     You'll get an error as a result of this, but if you click
>     `Continue', DasClient will auto-generate a stylesheet then
>     carry on, so don't worry about it too much for now.
> 
>   - Having connected to your server, I can browse around
>     without any errors, but I must confess that I haven't
>     actually seen any features.  This might just mean that
>     there aren't very many features in your server and I
>     haven't looked in the right place, but it could also mean
>     there's a problem -- especially if, as you say, you can't
>     see features on the Ensembl website either.
> 
> 
> Let me know if I can help any further with this,
> 
>     Thomas.
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