[Owldb-users] Fwd: Owldb-users post from dvrmchowdhary@gmail.com requires approval

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---------- Forwarded message ----------
From: Chowdary DVRM <dvr...@gm...>
Date: 2009/12/17
Subject: Re: [Owldb-users] Owldb-users post from
dvr...@gm... approval
To: Joachim Kleb <joa...@go...>

Hi Jaochim,
I get the following error when I try using owldb.
-------------------------------------------------------------
INFO [main] (?:?) - Loading ontology: jdbc:mysql://localhost/owldb
 INFO [main] (Environment.java:560) - Hibernate 3.3.2.GA
 INFO [main] (Environment.java:593) - hibernate.properties not found
 INFO [main] (Environment.java:771) - Bytecode provider name : javassist
 INFO [main] (Environment.java:652) - using JDK 1.4 java.sql.Timestamp
handling
 INFO [main] (Configuration.java:1474) - configuring from resource:
/hibernate.cfg.xml
 INFO [main] (Configuration.java:1451) - Configuration resource:
/hibernate.cfg.xml
ERROR [main] (?:?) - Initial SessionFactory creation failed.
org.hibernate.HibernateException: /hibernate.cfg.xml not found
    at
org.hibernate.util.ConfigHelper.getResourceAsStream(ConfigHelper.java:170)
    at
org.hibernate.cfg.Configuration.getConfigurationInputStream(Configuration.java:1453)
    at org.hibernate.cfg.Configuration.configure(Configuration.java:1475)
    at org.hibernate.cfg.Configuration.configure(Configuration.java:1462)
    at de.fraunhofer.iitb.owldb.util.HibernateCfgUtil.<init>(Unknown Source)
    at de.fraunhofer.iitb.owldb.OWLDBOntology.<init>(Unknown Source)
    at
de.fraunhofer.iitb.owldb.OWLDBOntologyFactory.createOWLOntology(Unknown
Source)
    at
de.fraunhofer.iitb.owldb.OWLDBOntologyFactory.createOWLOntology(Unknown
Source)
    at de.fraunhofer.iitb.owldb.OWLDBOntologyManager.createOntology(Unknown
Source)
    at de.fraunhofer.iitb.owldb.OWLDBStorer.storeOntology(Unknown Source)
    at de.fraunhofer.iitb.owldb.OWLDBStorer.storeOntology(Unknown Source)
    at de.fraunhofer.iitb.owldb.OWLDBOntologyManager.saveOntology(Unknown
Source)
    at ceti.osu.test.owldb.MyOwlDBTest.storeOntology(MyOwlDBTest.java:24)
    at ceti.osu.test.owldb.MyOwlDBTest.main(MyOwlDBTest.java:36)
Exception in thread "main" java.lang.ExceptionInInitializerError
    at de.fraunhofer.iitb.owldb.util.HibernateCfgUtil.<init>(Unknown Source)
    at de.fraunhofer.iitb.owldb.OWLDBOntology.<init>(Unknown Source)
    at
de.fraunhofer.iitb.owldb.OWLDBOntologyFactory.createOWLOntology(Unknown
Source)
    at
de.fraunhofer.iitb.owldb.OWLDBOntologyFactory.createOWLOntology(Unknown
Source)
    at de.fraunhofer.iitb.owldb.OWLDBOntologyManager.createOntology(Unknown
Source)
    at de.fraunhofer.iitb.owldb.OWLDBStorer.storeOntology(Unknown Source)
    at de.fraunhofer.iitb.owldb.OWLDBStorer.storeOntology(Unknown Source)
    at de.fraunhofer.iitb.owldb.OWLDBOntologyManager.saveOntology(Unknown
Source)
    at ceti.osu.test.owldb.MyOwlDBTest.storeOntology(MyOwlDBTest.java:24)
    at ceti.osu.test.owldb.MyOwlDBTest.main(MyOwlDBTest.java:36)
Caused by: org.hibernate.HibernateException: /hibernate.cfg.xml not found
    at
org.hibernate.util.ConfigHelper.getResourceAsStream(ConfigHelper.java:170)
    at
org.hibernate.cfg.Configuration.getConfigurationInputStream(Configuration.java:1453)
    at org.hibernate.cfg.Configuration.configure(Configuration.java:1475)
    at org.hibernate.cfg.Configuration.configure(Configuration.java:1462)
    ... 10 more
----------------------------------------
I am not sure which hibernate.cfg.xml is being looked for. I tried creating
it in my project, but I still doesn't work.

Thanks,
Chowdary.

On Tue, Dec 8, 2009 at 12:59 AM, Joachim Kleb
<joa...@go...>wrote:

>  Hi Chowdary,
>
> Sorry for the late reply. Regarding your first question: there is currently
> no generated jar-file
> included. The project repository include two ant-build-files in order to
> build the project and also create the jar-files.
> Therefore use ant (ant.apache.org) and execute "ant build" on the
> command line.
> 2: The java-doc will be also created during the build process. There
> will be a folder "javadoc" including all necessary html-files.
> There are also examples included in the source code explaining how to
> use OWLDB.
> 3: OWLDB make use of the OWL-API (http://owlapi.sourceforge.net/) and
> represents a database-backend for this api. Thus you can use the
> querying and reasoning functionality of the owl-api in order to access
> your ontology stored via the owldb in your database.
> OWLDB uses an hibernate-mapping that allows to map the ontology
> represented by the owlapi in a database. Here we tried to optimise the
> mapping regarding the general requirements of owl. The resulting schema
> is very specific. Reusing projects with already existing database
> schemas and transfering their data to an ontology means to map the data
> between both worlds. That could be done either by a programm focused on
> database transformations or by a programm reading your existing database
> and transfering it to owlapi objects. Subsequently it would be
> automatically stored in a database based on the owldb functionality.
>
> As an alternative you can also use D2R2
> (http://www4.wiwiss.fu-berlin.de/bizer/d2rq/) in order to map your
> existing db-schema to an ontology, dump it as rdf-ontology and use owldb
> as database-backend for this ontology.
>
> Best,
> Joachim
>
>
>  ------------------------------
>   Subject:
> A question on OWLDB
> From:
> Chowdary DVRM <dvr...@gm...> <dvr...@gm...>
> Date:
> Fri, 4 Dec 2009 11:22:48 -0500
> To:
> owl...@li...
> To:
> owl...@li...  Hi,
> I am trying to use OWLDB in my project and I have a few questions which I
> request you to help me with.
>
> 1. I don't see a jar file of the distribution in the svn. Where can I find
> it ?
> 2. Where can I find the javadoc for the api ?
> 3. I would like to know how the ontology(TBox and ABox) stored in a
> realational DB like MySQL can be queried and loaded into a reasoner like
> Pellet using owldb(may be going through owldb's api doc might help). In my
> project, the ontology schema and the existing database schema are a little
> different(with many overlappings) and I would like to query my database
> first to populate the ontology and load it into a reasoner for inferencing
> and store the entailments back into the database. So, basically, I guess I
> am trying to replicate what you have done with OWLdB. It would be great if
> you can comment on such situations where I don't want to stick to a database
> automatically generated from an ontology schema which is what I guess owl db
> does.
>
> Thanks&Regards,
> Chowdary Davuluri,
> M.S. in CS&E,
> The Ohio State University.
>
>
>
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