Andy,
I found the TDB transaction documentation on jena website, followed it and
it works now. Thank you.
Site (Victor) Guo
> From: [email protected]
> To: [email protected]
> Subject: RE: How to list models in a dataset?
> Date: Sun, 14 Apr 2013 12:00:04 -0500
>
> I'm running 2.10.0
> I think you are right. When I change the dataset to another newly created one
> it works.
>
> How am I supposed to sync the TDB before exiting JVM?
>
> Site (Victor) Guo
>
>
>
> > Date: Sun, 14 Apr 2013 17:55:35 +0100
> > From: [email protected]
> > To: [email protected]
> > Subject: Re: How to list models in a dataset?
> >
> > On 14/04/13 15:36, Site Guo wrote:
> > > Is there an API function that lists all models (graphs) within a given
> > > dataset?
> > >
> > > There is a function listNames() in Dataset. I am not sure if it is used
> > > to return all named graphs. When I tried to use it like this:
> > >
> > > Iterator<String> models = ds.listNames(); //ds is a dataset object that
> > > has been created and connected.
> > > while (models.hasNext())
> > > {
> > > System.out.println(models.next());
> > > }
> > >
> > > Java gave me the following error:
> > >
> > >
> > > Exception in thread "main" java.lang.NullPointerException
> > > at com.hp.hpl.jena.sparql.util.NodeUtils$1.accept(NodeUtils.java:94)
> > > at com.hp.hpl.jena.sparql.util.NodeUtils$1.accept(NodeUtils.java:90)
> > > at
> > > com.hp.hpl.jena.util.iterator.MapFilterIterator.hasNext(MapFilterIterator.java:55)
> > >
> > > I am using TDB.
> > >
> > > Could anyone help me figure that out ?
> > > Thanks in advance.
> >
> > Hi,
> >
> > I checked it works for me (Jena 2.10.1 development, TDB 0.10.1 development).
> >
> > A way this can occur is a corrupted database by non-transactional use
> > then exiting the JVM without sync'ing the database.
> >
> > Which version are you running>
> >
> > Andy
> >
> > >
> > > Site (Victor) Guo
> > >
> > >
> > >
> >
>
