Al Brown wrote:
Askild Aaberg Olsen wrote:
I've been using Jena with Cocoon without problems, so it's definitely
possible. If i remember correctly, Jena is included with the
Deli-block. You probably should make sure that this block is excluded
from the build.
You should also check that the error you get is actually a result of
you replacing jena.jar. If not, this is another issue that should be
resolved before you continue.
Askild
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Thanks, its good to know that I'm not alone.
I have part of my code working. I can open a prebuilt repoistory and
create a model.
When I go to run a query it fails. I have checked the version number,
at runtime, and I'm using the jena that came with cocoon.
It seems to not use my java classpath at all.
I have look in the jena-2.1.jar and it is a lot different than the one
that came with jena-2.5.2
I will try to reconfirm that I have a problem switching jena. I assume
that you are using what came with cocoon. Are you doing any sparql
querries?
Al
We replaced jena-2.1.jar with 2.3 or 2.4 i think, and also did
SPARQL-queries. This was from Flow and in XSLT (calling Java from Saxon,
which is actually a very nice feature...).
I haven't tried it with XSP.
There should not be any problems using Jena with Cocoon. I guess that if
you sort out your classpath-problems, then you'r up and running.
One issue I can think of is finding a way to keep the model in memory
between requests. We did not get as far as solving this, since that part
of the project are "resting", but I guess you could create your own
class with a static field to hold your models, like when keeping
Hibernate SessionFactories as in
http://www.hibernate.org/hib_docs/v3/reference/en/html_single/#tutorial-firstapp-helpers
And there's also the Issue of what to do with your results in Cocoon. I
guess that your planning to output your SPARQL-results into a pipeline.
Going from a graph-based model to XML (not RDF/XML) is not trivial, but
we were inspired by the following paper:
http://www.idealliance.org/papers/extreme/proceedings/html/2006/Souzis01/EML2006Souzis01.html
This resulted in a working prototype on an XQuery-engine towards the
Jena API.
I'm interested in hearing your results on these issues :-)
Askild
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