Hi Gerrit,
On Aug 25, 2011, at 6:54 PM, Gerrit wrote:
> I have a spin:UpdateTemplate with a DELETE WHERE clause:
>
> DELETE {
> ?this sc:hasMediaPath ?mp .
> }
> WHERE {
> ?this sc:hasMediaPath ?mp .
> ?mp bonding:mediaSourceSO ?mediaSource .
> ?mp bonding:mediaOriginator ?device2 .
> FILTER NOT EXISTS {
> ?this sc:connectedTo ?device2 .
> } .
> }
This does not look like a DELETE WHERE. That would be something like
DELETE WHERE {
?this sc:hasMediaPath ?mp
}
Anyway, just as an aside because I don't think this is the problem.
> I created the template by subclassing spin:UpdateTemplates and filling
> in spin:body with the above, and spin:labelTemplate with a human-
> readable string.
>
> This seems to work fine in TBC FE. When using it with SPIN 1.2.0, I
> get the following error:
>
> Exception in thread "main" java.lang.NullPointerException
> at org.topbraid.spin.util.UpdateUtil.addUpdatedGraphs(UpdateUtil.java:
> 58)
That line is
if(quad.isDefaultGraph()) {
results.add(graphStore.getDefaultModel().getGraph());
}
which indicates to me that your query is trying to update the default graph,
but your Dataset does not define a default graph. So please either check your
code where you construct the Dataset to make sure you give it a default graph,
or change your query so that it explicitly mentions a named graph using
DELETE {
GRAPH [g] {
...
}
}
WHERE {
...
}
If the triple you are trying to delete is inferred then it may be in a graph
that doesn't even have a name in the default Dataset, so you would need to
overload ARQFactory.getDataset() so that it returns a Dataset that has the
inferred graph as default graph, or the [g] above.
Cheers,
Holger
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