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Posted to dev@stanbol.apache.org by David Riccitelli <da...@interact.it> on 2011/08/29 10:58:40 UTC
exception
Dears,
I'm having an issue with Stanbol (r1153390), the analysis of a text fails
100% of the times with an exception. The root cause seems to
be: org.codehaus.jettison.json.JSONException: A JSONObject text must begin
with '{' at character 0 of
but how do I track down the issue?
Here's the full stack trace:
SEVERE: The exception contained within MappableContainerException could not
be mapped to a response, re-throwing to the HTTP container
org.apache.stanbol.enhancer.servicesapi.EngineException:
'NamedEntityTaggingEngine' failed to process content item
'urn:content-item-sha1-feef2e6a8bb37b08ff71e7b2d27582ae4c640adb' with type
'text/plain':
org.apache.stanbol.entityhub.servicesapi.site.ReferencedSiteException:
Unable to execute query on remote site http://dbpedia.org/sparql with
entitySearcher org.apache.stanbol.entityhub.searcher.VirtuosoSearcher!
at
org.apache.stanbol.enhancer.engines.entitytagging.impl.NamedEntityTaggingEngine.computeEnhancements(NamedEntityTaggingEngine.java:323)
at
org.apache.stanbol.enhancer.jobmanager.impl.InMemoryJobManager.enhanceContent(InMemoryJobManager.java:78)
at
org.apache.stanbol.enhancer.jersey.resource.EnginesRootResource.enhanceAndBuildResponse(EnginesRootResource.java:179)
at
org.apache.stanbol.enhancer.jersey.resource.EnginesRootResource.enhanceFromForm(EnginesRootResource.java:143)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:616)
at
com.sun.jersey.spi.container.JavaMethodInvokerFactory$1.invoke(JavaMethodInvokerFactory.java:60)
at
com.sun.jersey.server.impl.model.method.dispatch.AbstractResourceMethodDispatchProvider$ResponseOutInvoker._dispatch(AbstractResourceMethodDispatchProvider.java:205)
at
com.sun.jersey.server.impl.model.method.dispatch.ResourceJavaMethodDispatcher.dispatch(ResourceJavaMethodDispatcher.java:75)
at
com.sun.jersey.server.impl.uri.rules.HttpMethodRule.accept(HttpMethodRule.java:288)
at
com.sun.jersey.server.impl.uri.rules.ResourceClassRule.accept(ResourceClassRule.java:108)
at
com.sun.jersey.server.impl.uri.rules.RightHandPathRule.accept(RightHandPathRule.java:147)
at
com.sun.jersey.server.impl.uri.rules.RootResourceClassesRule.accept(RootResourceClassesRule.java:84)
at
com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1465)
at
com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1396)
at
com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1345)
at
com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1335)
at
com.sun.jersey.spi.container.servlet.WebComponent.service(WebComponent.java:416)
at
com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:537)
at
com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:699)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
at
org.apache.felix.http.base.internal.handler.ServletHandler.doHandle(ServletHandler.java:96)
at
org.apache.felix.http.base.internal.handler.ServletHandler.handle(ServletHandler.java:79)
at
org.apache.felix.http.base.internal.dispatch.ServletPipeline.handle(ServletPipeline.java:42)
at
org.apache.felix.http.base.internal.dispatch.InvocationFilterChain.doFilter(InvocationFilterChain.java:49)
at
org.apache.felix.http.base.internal.dispatch.HttpFilterChain.doFilter(HttpFilterChain.java:33)
at
org.apache.felix.http.base.internal.dispatch.FilterPipeline.dispatch(FilterPipeline.java:48)
at
org.apache.felix.http.base.internal.dispatch.Dispatcher.dispatch(Dispatcher.java:39)
at
org.apache.felix.http.base.internal.DispatcherServlet.service(DispatcherServlet.java:67)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511)
at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:390)
at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)
at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765)
at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
at org.mortbay.jetty.Server.handle(Server.java:326)
at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542)
at
org.mortbay.jetty.HttpConnection$RequestHandler.content(HttpConnection.java:943)
at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:756)
at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:218)
at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
at
org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:410)
at
org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:582)
Caused by:
org.apache.stanbol.entityhub.servicesapi.site.ReferencedSiteException:
Unable to execute query on remote site http://dbpedia.org/sparql with
entitySearcher org.apache.stanbol.entityhub.searcher.VirtuosoSearcher!
at
org.apache.stanbol.entityhub.core.impl.ReferencedSiteImpl.findEntities(ReferencedSiteImpl.java:318)
at
org.apache.stanbol.enhancer.engines.entitytagging.impl.NamedEntityTaggingEngine.computeEntityRecommentations(NamedEntityTaggingEngine.java:408)
at
org.apache.stanbol.enhancer.engines.entitytagging.impl.NamedEntityTaggingEngine.computeEnhancements(NamedEntityTaggingEngine.java:320)
... 44 more
Caused by: java.io.IOException: Unable to parse JSON Result Set for parsed
query
at
org.apache.stanbol.entityhub.site.linkeddata.impl.SparqlSearcher.extractEntitiesFromJsonResult(SparqlSearcher.java:113)
at
org.apache.stanbol.entityhub.site.linkeddata.impl.VirtuosoSearcher.findEntities(VirtuosoSearcher.java:92)
at
org.apache.stanbol.entityhub.core.impl.ReferencedSiteImpl.findEntities(ReferencedSiteImpl.java:316)
... 46 more
Caused by: org.codehaus.jettison.json.JSONException: A JSONObject text must
begin with '{' at character 0 of
at org.codehaus.jettison.json.JSONTokener.syntaxError(JSONTokener.java:439)
at org.codehaus.jettison.json.JSONObject.<init>(JSONObject.java:169)
at org.codehaus.jettison.json.JSONObject.<init>(JSONObject.java:266)
at
org.apache.stanbol.entityhub.site.linkeddata.impl.SparqlSearcher.extractEntitiesFromJsonResult(SparqlSearcher.java:87)
... 48 more
--
David Riccitelli
-----
Skype: ziodave
Twitter: @ziodave
LinkedIn: http://it.linkedin.com/in/riccitelli
-----
Interact SpA
Via A. Bargoni 78 (scala F)
00153 Roma
T +39 06 58318 301
F +39 06 58318 303
Re: exception
Posted by David Riccitelli <da...@interact.it>.
If I run, $ curl "
http://dbpedia.org/sparql?query=SELECT+DISTINCT+?id+%ntax-ns%23type%3E+%3Chttp://dbpedia.org/ontology/Person%3E+.+%0A++++?id+%3Chttp://www.w3.org/2000/01/rdf-schema%23label%3E+?tmp1+.+%0A++++++?tmp1+bif:contains+'%22Plantar%22'+.+%0A%7D+%0A%7D+%0AORDER+BY+DESC+(+%3CLONG::IRI_RANK%3E+(?id)+)+%0ALIMIT+20+%0A&format=application/sparql-results%2Bjson
"
I get a:
{ "head": { "link": [], "vars": ["id"] },
"results": { "distinct": false, "ordered": true, "bindings": [ ] } }
David
On Mon, Aug 29, 2011 at 5:40 PM, David Riccitelli <
david.riccitelli@interact.it> wrote:
> Hi Rupert,
>
> I think is this one:
> http://dbpedia.org/sparql?query=SELECT+DISTINCT+?id+%0AWHERE+%7B+%0A++%7B+%0A++++?id+%3Chttp://www.w3.org/1999/02/22-rdf-syntax-ns%23type%3E+%3Chttp://dbpedia.org/ontology/Person%3E+.+%0A++++?id+%3Chttp://www.w3.org/2000/01/rdf-schema%23label%3E+?tmp1+.+%0A++++++?tmp1+bif:contains+'%22Plantar%22'+.+%0A%7D+%0A%7D+%0AORDER+BY+DESC+(+%3CLONG::IRI_RANK%3E+(?id)+)+%0ALIMIT+20+%0A&format=application/sparql-results%2Bjson
>
> In fact before that exception I have this one:
>
> 29.08.2011 08:51:54.939 *WARN* [1605442425@qtp-23480987-1]
> org.apache.felix.http.jetty /engines/
> (org.apache.stanbol.enhancer.servicesapi.EngineException:
> 'NamedEntityTaggingEngine' failed to process content item
> 'urn:content-item-sha1-feef2e6a8bb37b08ff71e7b2d27582ae4c640adb' with type
> 'text/plain':
> org.apache.stanbol.entityhub.servicesapi.site.ReferencedSiteException:
> Unable to execute query on remote site http://dbpedia.org/sparql with
> entitySearcher org.apache.stanbol.entityhub.searcher.VirtuosoSearcher!)
> org.apache.stanbol.enhancer.servicesapi.EngineException:
> 'NamedEntityTaggingEngine' failed to process content item
> 'urn:content-item-sha1-feef2e6a8bb37b08ff71e7b2d27582ae4c640adb' with type
> 'text/plain':
> org.apache.stanbol.entityhub.servicesapi.site.ReferencedSiteException:
> Unable to execute query on remote site http://dbpedia.org/sparql with
> entitySearcher org.apache.stanbol.entityhub.searcher.VirtuosoSearcher!
> (...)
> Caused by: java.io.IOException: Server returned HTTP response code: 500 for
> URL:
> http://dbpedia.org/sparql?query=SELECT+DISTINCT+?id+%0AWHERE+%7B+%0A++%7B+%0A++++?id+%3Chttp://www.w3.org/1999/02/22-rdf-syntax-ns%23type%3E+%3Chttp://dbpedia.org/ontology/Person%3E+.+%0A++++?id+%3Chttp://www.w3.org/2000/01/rdf-schema%23label%3E+?tmp1+.+%0A++++++?tmp1+bif:contains+'%22Plantar%22'+.+%0A%7D+%0A%7D+%0AORDER+BY+DESC+(+%3CLONG::IRI_RANK%3E+(?id)+)+%0ALIMIT+20+%0A&format=application/sparql-results%2Bjson
> (...)
>
> And then I have lots of these (at least 20):
>
> 29.08.2011 08:53:35.924 *INFO* [1605442425@qtp-23480987-1]
> org.apache.stanbol.enhancer.servicesapi.helper.EnhancementEngineHelper No
> Triple found for <urn:enhancement-fa2cfb8d-5cad-5e80-ea03-b2b39be6f404> and
> property <http://purl.org/dc/terms/type>! -> return null
> 29.08.2011 08:53:35.924 *WARN* [1605442425@qtp-23480987-1]
> org.apache.stanbol.enhancer.engines.entitytagging.impl.NamedEntityTaggingEngine
> Unable to process TextAnnotation
> <urn:enhancement-fa2cfb8d-5cad-5e80-ea03-b2b39be6f404> because property<
> http://purl.org/dc/terms/type> is not present
>
> Thanks!
>
> David
>
> On Mon, Aug 29, 2011 at 4:44 PM, Rupert Westenthaler <
> rupert.westenthaler@gmail.com> wrote:
>
>> Hi David
>>
>> To me it looks like that the SPARQL endpoint of dbpedia does not
>> return valid JSON as results of a SPARQL CONSTRUCT query.
>>
>> I think in the error.log file (/sling/logs/error.log) should provide
>> some additional information (such as the query sent to
>> "http://dbpedia.org/sparql".
>> You could e.g. use your browser to see the returned results yourself.
>> If you provide such information I could also make some tests and help.
>>
>> best
>> Rupert
>>
>> On Mon, Aug 29, 2011 at 11:20 AM, Bertrand Delacretaz
>> <bd...@apache.org> wrote:
>> > Hi David,
>> >
>> > On Mon, Aug 29, 2011 at 10:58 AM, David Riccitelli
>> > <da...@interact.it> wrote:
>> >> ...I'm having an issue with Stanbol (r1153390), the analysis of a text
>> fails
>> >> 100% of the times with an exception. The root cause seems to
>> >> be: org.codehaus.jettison.json.JSONException: A JSONObject text must
>> begin
>> >> with '{' at character 0 of
>> >>
>> >> but how do I track down the issue?...
>> >
>> > Seems like it's happening here:
>> >
>> > org.apache.stanbol.entityhub.servicesapi.site.ReferencedSiteException:
>> > Unable to execute query on remote site http://dbpedia.org/sparql with
>> > entitySearcher
>> org.apache.stanbol.entityhub.searcher.VirtuosoSearcher!...
>> >
>> > I'd try debugging that VirtuosoSearcher and especially have a look a
>> > that what sparql endpoint is returning.
>> >
>> > -Bertrand
>> >
>>
>>
>>
>> --
>> | Rupert Westenthaler rupert.westenthaler@gmail.com
>> | Bodenlehenstraße 11 ++43-699-11108907
>> | A-5500 Bischofshofen
>>
>
>
>
> --
> David Riccitelli
> -----
> Skype: ziodave
> Twitter: @ziodave
> LinkedIn: http://it.linkedin.com/in/riccitelli
> -----
> Interact SpA
> Via A. Bargoni 78 (scala F)
> 00153 Roma
>
> T +39 06 58318 301
> F +39 06 58318 303
>
>
--
David Riccitelli
-----
Skype: ziodave
Twitter: @ziodave
LinkedIn: http://it.linkedin.com/in/riccitelli
-----
Interact SpA
Via A. Bargoni 78 (scala F)
00153 Roma
T +39 06 58318 301
F +39 06 58318 303
Re: exception
Posted by David Riccitelli <da...@interact.it>.
I made a tcpdump to see the exact packets flowing. I confirm, DBpedia is
sending empty responses:
stanbol > dbpedia
GET
/sparql?query=SELECT+DISTINCT+?id+%0AWHERE+%7B+%0A++%7B+%0A++++?id+%3Chttp://
www.w3.org/1999/02/22-rdf-syntax-ns%23type%3E+%3Chttp://dbpedia.org/ontology/Organisation%3E+.+%0A++++?id+%3Chttp://www.w3.org/2000/01/rdf-schema%23label%3E+?tmp1+.+%0A++++++?tmp1+bif:contains+'(%22Research%22+AND+%22in%22+AND+%22Motion%22)'+.+%0A%7D+%0A%7D+%0AORDER+BY+DESC+(+%3CLONG::IRI_RANK%3E+(?id)+)+%0ALIMIT+20+%0A&format=application/sparql-results%2BjsonHTTP/1.1
Accept: application/sparql-results+json
User-Agent: Java/1.6.0_20
Host: dbpedia.org
Connection: keep-alive
dbpedia > stanbol
HTTP/1.1 200 OK
Date: Tue, 30 Aug 2011 09:05:41 GMT
Content-Type: application/sparql-results+json; charset=UTF-8
Connection: keep-alive
Server: Virtuoso/06.02.3130 (Linux) x86_64-generic-linux-glibc25-64 VDB
Accept-Ranges: bytes
Content-Length: 203
-----
Content Length of 203, but nothing after ... other tests made with curl:
$ curl "
http://dbpedia.org/sparql?query=SELECT+DISTINCT+?id+%0AWHERE+%7B+%0A++%7B+%0A++++?id+%3Chttp://www.w3.org/2000/01/rdf-schema%23label%3E+?tmp1+.+%0A++++++?tmp1+bif:contains+'(%22London%22+AND+%22Metropolitan%22+AND+%22Police%22)'+.+%0A%7D+%0A%7D+%0AORDER+BY+DESC+(+%3CLONG::IRI_RANK%3E+(?id)+)+%0ALIMIT+20+%0A&format=application/sparql-results%2Bjson
"
*curl: (18) transfer closed with 311 bytes remaining to read*
David
On Tue, Aug 30, 2011 at 12:04 PM, Rupert Westenthaler <
rupert.westenthaler@gmail.com> wrote:
> On Tue, Aug 30, 2011 at 10:45 AM, David Riccitelli
> <da...@interact.it> wrote:
> > Thanks Rupert,
> >>
> >> So for me it looks like that the dbpedia.org SPARQL server has
> >> currently some problems in writing JSON responses.
> >
> > According to you, if I would create an offline cache of DBpedia, would I
> be
> > able to overcome this issue?
>
> Queries are not supported by "caches". (cache strategy "used")
> Only if you use local index (cache strategy "all") also queries are
> exceeded on the locally available data.
>
> You could simple go the the configuration tab of the Felix Web Console
> (http://localhost:8080/system/console/configMgr), open the
> configuration for the dbpedia Referenced Site and change the
> configuration of the CacheStrategy from "used" to "all". After that
> queries should be executed locally over the entities you have
> previously cached from dbpedia.org.
>
> best
> Rupert Westenthaler
>
> BTW: I forgot to mention in my last mail, that I am getting the exact
> same JSONExceptions as you mentioned.
> Caused by:
> org.apache.stanbol.entityhub.servicesapi.site.ReferencedSiteException:
> Unable to execute query on remote site http://dbpedia.org/sparql with
> entitySearcher org.apache.stanbol.entityhub.searcher.VirtuosoSearcher!
> at
> org.apache.stanbol.entityhub.core.impl.ReferencedSiteImpl.findEntities(ReferencedSiteImpl.java:318)
> at
> org.apache.stanbol.enhancer.engines.entitytagging.impl.NamedEntityTaggingEngine.computeEntityRecommentations(NamedEntityTaggingEngine.java:408)
> at
> org.apache.stanbol.enhancer.engines.entitytagging.impl.NamedEntityTaggingEngine.computeEnhancements(NamedEntityTaggingEngine.java:320)
> ... 44 more
> Caused by: java.io.IOException: Unable to parse JSON Result Set for parsed
> query
> at
> org.apache.stanbol.entityhub.site.linkeddata.impl.SparqlSearcher.extractEntitiesFromJsonResult(SparqlSearcher.java:113)
> at
> org.apache.stanbol.entityhub.site.linkeddata.impl.VirtuosoSearcher.findEntities(VirtuosoSearcher.java:92)
> at
> org.apache.stanbol.entityhub.core.impl.ReferencedSiteImpl.findEntities(ReferencedSiteImpl.java:316)
> ... 46 more
> Caused by: org.codehaus.jettison.json.JSONException: A JSONObject text
> must begin with '{' at character 0 of
> at
> org.codehaus.jettison.json.JSONTokener.syntaxError(JSONTokener.java:439)
> at org.codehaus.jettison.json.JSONObject.<init>(JSONObject.java:169)
> at org.codehaus.jettison.json.JSONObject.<init>(JSONObject.java:266)
> at
> org.apache.stanbol.entityhub.site.linkeddata.impl.SparqlSearcher.extractEntitiesFromJsonResult(SparqlSearcher.java:87)
> ... 48 more
>
>
>
> > BR
> > David
> > On Tue, Aug 30, 2011 at 11:39 AM, Rupert Westenthaler
> > <ru...@gmail.com> wrote:
> >>
> >> Hi David
> >>
> >> On Mon, Aug 29, 2011 at 4:40 PM, David Riccitelli
> >> <da...@interact.it> wrote:
> >> > Hi Rupert,
> >> >
> >> > I think is this one:
> >> >
> >> >
> http://dbpedia.org/sparql?query=SELECT+DISTINCT+?id+%0AWHERE+%7B+%0A++%7B+%0A++++?id+%3Chttp://www.w3.org/1999/02/22-rdf-syntax-ns%23type%3E+%3Chttp://dbpedia.org/ontology/Person%3E+.+%0A++++?id+%3Chttp://www.w3.org/2000/01/rdf-schema%23label%3E+?tmp1+.+%0A++++++?tmp1+bif:contains+'%22Plantar%22'+.+%0A%7D+%0A%7D+%0AORDER+BY+DESC+(+%3CLONG::IRI_RANK%3E+(?id)+)+%0ALIMIT+20+%0A&format=application/sparql-results%2Bjson
> >> >
> >>
> >> This corresponds to this SPARQL query:
> >>
> >> SELECT DISTINCT ?id
> >> WHERE {
> >> {
> >> ?id <http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
> >> <http://dbpedia.org/ontology/Person> .
> >> ?id <http://www.w3.org/2000/01/rdf-schema#label> ?tmp1 .
> >> ?tmp1 bif:contains '"Plantar"' .
> >> }
> >> }
> >> ORDER BY DESC ( <LONG::IRI_RANK> (?id) )
> >> LIMIT 20
> >>
> >> this is a typical query as used by the NamedEntityTaggingEngine to
> lookup
> >> an Entity with the name "Plantar" for an TextAnnotation with the
> >> dc:type dbpedia-ont:Person
> >>
> >> > In fact before that exception I have this one:
> >> >
> >> > 29.08.2011 08:51:54.939 *WARN* [1605442425@qtp-23480987-1]
> >> > org.apache.felix.http.jetty /engines/
> >> > (org.apache.stanbol.enhancer.servicesapi.EngineException:
> >> > 'NamedEntityTaggingEngine' failed to process content item
> >> > 'urn:content-item-sha1-feef2e6a8bb37b08ff71e7b2d27582ae4c640adb' with
> >> > type
> >> > 'text/plain':
> >> > org.apache.stanbol.entityhub.servicesapi.site.ReferencedSiteException:
> >> > Unable to execute query on remote site http://dbpedia.org/sparql with
> >> > entitySearcher
> org.apache.stanbol.entityhub.searcher.VirtuosoSearcher!)
> >> > org.apache.stanbol.enhancer.servicesapi.EngineException:
> >> > 'NamedEntityTaggingEngine' failed to process content item
> >> > 'urn:content-item-sha1-feef2e6a8bb37b08ff71e7b2d27582ae4c640adb' with
> >> > type
> >> > 'text/plain':
> >> > org.apache.stanbol.entityhub.servicesapi.site.ReferencedSiteException:
> >> > Unable to execute query on remote site http://dbpedia.org/sparql with
> >> > entitySearcher org.apache.stanbol.entityhub.searcher.VirtuosoSearcher!
> >> > (...)
> >> > Caused by: java.io.IOException: Server returned HTTP response code:
> 500
> >> > for
> >> > URL:
> >> >
> >> >
> http://dbpedia.org/sparql?query=SELECT+DISTINCT+?id+%0AWHERE+%7B+%0A++%7B+%0A++++?id+%3Chttp://www.w3.org/1999/02/22-rdf-syntax-ns%23type%3E+%3Chttp://dbpedia.org/ontology/Person%3E+.+%0A++++?id+%3Chttp://www.w3.org/2000/01/rdf-schema%23label%3E+?tmp1+.+%0A++++++?tmp1+bif:contains+'%22Plantar%22'+.+%0A%7D+%0A%7D+%0AORDER+BY+DESC+(+%3CLONG::IRI_RANK%3E+(?id)+)+%0ALIMIT+20+%0A&format=application/sparql-results%2Bjson
> >> > (...)
> >> >
> >> In the earlier mail you where getting a JSONException while praising
> >> the response of a query. Here you are getting a 500 indicating the the
> >> dbpedia SPARQL endpoint had some problems.
> >>
> >> Testing this query today resulted in a 200. However I could observe
> >> strange behavior while testing.
> >> Precisely: sending the above URL with curl -v printed the headers of
> >> the response however after that the curl command has not terminated as
> >> expected. It kept running until I manually terminated it.
> >> Making the same request but without the
> >> "&format=application/sparql-results%2Bjson" parameter I was also
> >> getting a 200 (as expected) but this time curl terminated and printed
> >>
> >> <sparql xmlns="http://www.w3.org/2005/sparql-results#"
> >> xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
> >> xsi:schemaLocation="
> http://www.w3.org/2001/sw/DataAccess/rf1/result2.xsd">
> >> <head>
> >> <variable name="id"/>
> >> </head>
> >> <results distinct="false" ordered="true">
> >> </results>
> >> </sparql>
> >>
> >> ... an empty response.
> >>
> >> If I make a request with the above URL (including the
> >> "&format=application/sparql-results%2Bjson") directly in the Browser I
> >> get an empty response. As far as I know this would not be valid JSON
> >> and could explain the JSONException as mentioned in the earlier mail.
> >>
> >> So for me it looks like that the dbpedia.org SPARQL server has
> >> currently some problems in writing JSON responses.
> >>
> >> On Mon, Aug 29, 2011 at 4:51 PM, David Riccitelli
> >> <da...@interact.it> wrote:
> >> > If I run, $ curl "
> >> >
> >> >
> http://dbpedia.org/sparql?query=SELECT+DISTINCT+?id+%ntax-ns%23type%3E+%3Chttp://dbpedia.org/ontology/Person%3E+.+%0A++++?id+%3Chttp://www.w3.org/2000/01/rdf-schema%23label%3E+?tmp1+.+%0A++++++?tmp1+bif:contains+'%22Plantar%22'+.+%0A%7D+%0A%7D+%0AORDER+BY+DESC+(+%3CLONG::IRI_RANK%3E+(?id)+)+%0ALIMIT+20+%0A&format=application/sparql-results%2Bjson
> >> > "
> >> >
> >> > I get a:
> >> >
> >> > { "head": { "link": [], "vars": ["id"] },
> >> > "results": { "distinct": false, "ordered": true, "bindings": [ ] } }
> >> >
> >> I was not able to confirm this. The above URL is not an valid request
> >> because
> >>
> >> SELECT+DISTINCT+?id+%ntax-ns%23type%3E+
> >>
> >> "%ntax-ns" is not valid. Could it be that you have missed some parts
> >> when copying this request to the mail?
> >>
> >> However the result noted in this mail would be the expected response
> >> if the query would not return any results.
> >>
> >> On Mon, Aug 29, 2011 at 4:40 PM, David Riccitelli
> >> <da...@interact.it> wrote:
> >> > And then I have lots of these (at least 20):
> >> >
> >> > 29.08.2011 08:53:35.924 *INFO* [1605442425@qtp-23480987-1]
> >> > org.apache.stanbol.enhancer.servicesapi.helper.EnhancementEngineHelper
> >> > No
> >> > Triple found for
> <urn:enhancement-fa2cfb8d-5cad-5e80-ea03-b2b39be6f404>
> >> > and
> >> > property <http://purl.org/dc/terms/type>! -> return null
> >> > 29.08.2011 08:53:35.924 *WARN* [1605442425@qtp-23480987-1]
> >> >
> >> >
> org.apache.stanbol.enhancer.engines.entitytagging.impl.NamedEntityTaggingEngine
> >> > Unable to process TextAnnotation
> >> > <urn:enhancement-fa2cfb8d-5cad-5e80-ea03-b2b39be6f404> because
> property<
> >> > http://purl.org/dc/terms/type> is not present
> >> >
> >>
> >> Before processing TextAnnotations the NamedEntityTaggingEngine checks
> >> that the "dc:type" and "selected-text" properties are present for an
> >> TextAnnotations. So if you see such warnings there must be some other
> >> enhancement engine present that creates TextAnnotations that are
> >> missing the "dc:type" property.
> >>
> >> best
> >> Rupert Westenthaler
> >>
> >>
> >> --
> >> | Rupert Westenthaler rupert.westenthaler@gmail.com
> >> | Bodenlehenstraße 11 ++43-699-11108907
> >> | A-5500 Bischofshofen
> >
> >
> >
> > --
> > David Riccitelli
> > -----
> > Skype: ziodave
> > Twitter: @ziodave
> > LinkedIn: http://it.linkedin.com/in/riccitelli
> > -----
> > Interact SpA
> > Via A. Bargoni 78 (scala F)
> > 00153 Roma
> >
> > T +39 06 58318 301
> > F +39 06 58318 303
> >
>
>
>
> --
> | Rupert Westenthaler rupert.westenthaler@gmail.com
> | Bodenlehenstraße 11 ++43-699-11108907
> | A-5500 Bischofshofen
>
--
David Riccitelli
-----
Skype: ziodave
Twitter: @ziodave
LinkedIn: http://it.linkedin.com/in/riccitelli
-----
Interact SpA
Via A. Bargoni 78 (scala F)
00153 Roma
T +39 06 58318 301
F +39 06 58318 303
Re: exception
Posted by Rupert Westenthaler <ru...@gmail.com>.
Hi
On Tue, Aug 30, 2011 at 11:15 AM, David Riccitelli
<da...@interact.it> wrote:
> Hi Rupert,
>>
>> Queries are not supported by "caches". (cache strategy "used")
>> Only if you use local index (cache strategy "all") also queries are
>> exceeded on the locally available data.
>
> What is the all behaviour? Is it like:
> [1] check into cache,
> [2] return cache,
> [3] if not found in cache, retrieve online,
> [4] in cache
This is exactly how it works for requests for Entities by ID and Cache
Strategy "used".
For Queries the cache is not used (if Cache Strategy "used" is
configured). Queries are always forwarded to the remote Site, because
executing a query a partially locally cached dataset would not provide
the complete result set.
In case of Cache Stragegy "all" than the remote service are only used
as fallback if of the local cache is not available of throws an
Exception.
So in case of a request for an Entity by ID it would return a 404 if
it is not locally cached. I case of a query it would perform the query
on the locally cached entities only.
best
Rupert Westenthaler
--
| Rupert Westenthaler rupert.westenthaler@gmail.com
| Bodenlehenstraße 11 ++43-699-11108907
| A-5500 Bischofshofen
Re: exception
Posted by David Riccitelli <da...@interact.it>.
Hi Rupert,
Queries are not supported by "caches". (cache strategy "used")
> Only if you use local index (cache strategy "all") also queries are
> exceeded on the locally available data.
What is the all behaviour? Is it like:
[1] check into cache,
[2] return cache,
[3] if not found in cache, retrieve online,
[4] in cache
Or, if it's not in the cache, is not going to be retrieved?
Thanks!
David
On Tue, Aug 30, 2011 at 12:04 PM, Rupert Westenthaler <
rupert.westenthaler@gmail.com> wrote:
> On Tue, Aug 30, 2011 at 10:45 AM, David Riccitelli
> <da...@interact.it> wrote:
> > Thanks Rupert,
> >>
> >> So for me it looks like that the dbpedia.org SPARQL server has
> >> currently some problems in writing JSON responses.
> >
> > According to you, if I would create an offline cache of DBpedia, would I
> be
> > able to overcome this issue?
>
> Queries are not supported by "caches". (cache strategy "used")
> Only if you use local index (cache strategy "all") also queries are
> exceeded on the locally available data.
>
> You could simple go the the configuration tab of the Felix Web Console
> (http://localhost:8080/system/console/configMgr), open the
> configuration for the dbpedia Referenced Site and change the
> configuration of the CacheStrategy from "used" to "all". After that
> queries should be executed locally over the entities you have
> previously cached from dbpedia.org.
>
> best
> Rupert Westenthaler
>
> BTW: I forgot to mention in my last mail, that I am getting the exact
> same JSONExceptions as you mentioned.
> Caused by:
> org.apache.stanbol.entityhub.servicesapi.site.ReferencedSiteException:
> Unable to execute query on remote site http://dbpedia.org/sparql with
> entitySearcher org.apache.stanbol.entityhub.searcher.VirtuosoSearcher!
> at
> org.apache.stanbol.entityhub.core.impl.ReferencedSiteImpl.findEntities(ReferencedSiteImpl.java:318)
> at
> org.apache.stanbol.enhancer.engines.entitytagging.impl.NamedEntityTaggingEngine.computeEntityRecommentations(NamedEntityTaggingEngine.java:408)
> at
> org.apache.stanbol.enhancer.engines.entitytagging.impl.NamedEntityTaggingEngine.computeEnhancements(NamedEntityTaggingEngine.java:320)
> ... 44 more
> Caused by: java.io.IOException: Unable to parse JSON Result Set for parsed
> query
> at
> org.apache.stanbol.entityhub.site.linkeddata.impl.SparqlSearcher.extractEntitiesFromJsonResult(SparqlSearcher.java:113)
> at
> org.apache.stanbol.entityhub.site.linkeddata.impl.VirtuosoSearcher.findEntities(VirtuosoSearcher.java:92)
> at
> org.apache.stanbol.entityhub.core.impl.ReferencedSiteImpl.findEntities(ReferencedSiteImpl.java:316)
> ... 46 more
> Caused by: org.codehaus.jettison.json.JSONException: A JSONObject text
> must begin with '{' at character 0 of
> at
> org.codehaus.jettison.json.JSONTokener.syntaxError(JSONTokener.java:439)
> at org.codehaus.jettison.json.JSONObject.<init>(JSONObject.java:169)
> at org.codehaus.jettison.json.JSONObject.<init>(JSONObject.java:266)
> at
> org.apache.stanbol.entityhub.site.linkeddata.impl.SparqlSearcher.extractEntitiesFromJsonResult(SparqlSearcher.java:87)
> ... 48 more
>
>
>
> > BR
> > David
> > On Tue, Aug 30, 2011 at 11:39 AM, Rupert Westenthaler
> > <ru...@gmail.com> wrote:
> >>
> >> Hi David
> >>
> >> On Mon, Aug 29, 2011 at 4:40 PM, David Riccitelli
> >> <da...@interact.it> wrote:
> >> > Hi Rupert,
> >> >
> >> > I think is this one:
> >> >
> >> >
> http://dbpedia.org/sparql?query=SELECT+DISTINCT+?id+%0AWHERE+%7B+%0A++%7B+%0A++++?id+%3Chttp://www.w3.org/1999/02/22-rdf-syntax-ns%23type%3E+%3Chttp://dbpedia.org/ontology/Person%3E+.+%0A++++?id+%3Chttp://www.w3.org/2000/01/rdf-schema%23label%3E+?tmp1+.+%0A++++++?tmp1+bif:contains+'%22Plantar%22'+.+%0A%7D+%0A%7D+%0AORDER+BY+DESC+(+%3CLONG::IRI_RANK%3E+(?id)+)+%0ALIMIT+20+%0A&format=application/sparql-results%2Bjson
> >> >
> >>
> >> This corresponds to this SPARQL query:
> >>
> >> SELECT DISTINCT ?id
> >> WHERE {
> >> {
> >> ?id <http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
> >> <http://dbpedia.org/ontology/Person> .
> >> ?id <http://www.w3.org/2000/01/rdf-schema#label> ?tmp1 .
> >> ?tmp1 bif:contains '"Plantar"' .
> >> }
> >> }
> >> ORDER BY DESC ( <LONG::IRI_RANK> (?id) )
> >> LIMIT 20
> >>
> >> this is a typical query as used by the NamedEntityTaggingEngine to
> lookup
> >> an Entity with the name "Plantar" for an TextAnnotation with the
> >> dc:type dbpedia-ont:Person
> >>
> >> > In fact before that exception I have this one:
> >> >
> >> > 29.08.2011 08:51:54.939 *WARN* [1605442425@qtp-23480987-1]
> >> > org.apache.felix.http.jetty /engines/
> >> > (org.apache.stanbol.enhancer.servicesapi.EngineException:
> >> > 'NamedEntityTaggingEngine' failed to process content item
> >> > 'urn:content-item-sha1-feef2e6a8bb37b08ff71e7b2d27582ae4c640adb' with
> >> > type
> >> > 'text/plain':
> >> > org.apache.stanbol.entityhub.servicesapi.site.ReferencedSiteException:
> >> > Unable to execute query on remote site http://dbpedia.org/sparql with
> >> > entitySearcher
> org.apache.stanbol.entityhub.searcher.VirtuosoSearcher!)
> >> > org.apache.stanbol.enhancer.servicesapi.EngineException:
> >> > 'NamedEntityTaggingEngine' failed to process content item
> >> > 'urn:content-item-sha1-feef2e6a8bb37b08ff71e7b2d27582ae4c640adb' with
> >> > type
> >> > 'text/plain':
> >> > org.apache.stanbol.entityhub.servicesapi.site.ReferencedSiteException:
> >> > Unable to execute query on remote site http://dbpedia.org/sparql with
> >> > entitySearcher org.apache.stanbol.entityhub.searcher.VirtuosoSearcher!
> >> > (...)
> >> > Caused by: java.io.IOException: Server returned HTTP response code:
> 500
> >> > for
> >> > URL:
> >> >
> >> >
> http://dbpedia.org/sparql?query=SELECT+DISTINCT+?id+%0AWHERE+%7B+%0A++%7B+%0A++++?id+%3Chttp://www.w3.org/1999/02/22-rdf-syntax-ns%23type%3E+%3Chttp://dbpedia.org/ontology/Person%3E+.+%0A++++?id+%3Chttp://www.w3.org/2000/01/rdf-schema%23label%3E+?tmp1+.+%0A++++++?tmp1+bif:contains+'%22Plantar%22'+.+%0A%7D+%0A%7D+%0AORDER+BY+DESC+(+%3CLONG::IRI_RANK%3E+(?id)+)+%0ALIMIT+20+%0A&format=application/sparql-results%2Bjson
> >> > (...)
> >> >
> >> In the earlier mail you where getting a JSONException while praising
> >> the response of a query. Here you are getting a 500 indicating the the
> >> dbpedia SPARQL endpoint had some problems.
> >>
> >> Testing this query today resulted in a 200. However I could observe
> >> strange behavior while testing.
> >> Precisely: sending the above URL with curl -v printed the headers of
> >> the response however after that the curl command has not terminated as
> >> expected. It kept running until I manually terminated it.
> >> Making the same request but without the
> >> "&format=application/sparql-results%2Bjson" parameter I was also
> >> getting a 200 (as expected) but this time curl terminated and printed
> >>
> >> <sparql xmlns="http://www.w3.org/2005/sparql-results#"
> >> xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
> >> xsi:schemaLocation="
> http://www.w3.org/2001/sw/DataAccess/rf1/result2.xsd">
> >> <head>
> >> <variable name="id"/>
> >> </head>
> >> <results distinct="false" ordered="true">
> >> </results>
> >> </sparql>
> >>
> >> ... an empty response.
> >>
> >> If I make a request with the above URL (including the
> >> "&format=application/sparql-results%2Bjson") directly in the Browser I
> >> get an empty response. As far as I know this would not be valid JSON
> >> and could explain the JSONException as mentioned in the earlier mail.
> >>
> >> So for me it looks like that the dbpedia.org SPARQL server has
> >> currently some problems in writing JSON responses.
> >>
> >> On Mon, Aug 29, 2011 at 4:51 PM, David Riccitelli
> >> <da...@interact.it> wrote:
> >> > If I run, $ curl "
> >> >
> >> >
> http://dbpedia.org/sparql?query=SELECT+DISTINCT+?id+%ntax-ns%23type%3E+%3Chttp://dbpedia.org/ontology/Person%3E+.+%0A++++?id+%3Chttp://www.w3.org/2000/01/rdf-schema%23label%3E+?tmp1+.+%0A++++++?tmp1+bif:contains+'%22Plantar%22'+.+%0A%7D+%0A%7D+%0AORDER+BY+DESC+(+%3CLONG::IRI_RANK%3E+(?id)+)+%0ALIMIT+20+%0A&format=application/sparql-results%2Bjson
> >> > "
> >> >
> >> > I get a:
> >> >
> >> > { "head": { "link": [], "vars": ["id"] },
> >> > "results": { "distinct": false, "ordered": true, "bindings": [ ] } }
> >> >
> >> I was not able to confirm this. The above URL is not an valid request
> >> because
> >>
> >> SELECT+DISTINCT+?id+%ntax-ns%23type%3E+
> >>
> >> "%ntax-ns" is not valid. Could it be that you have missed some parts
> >> when copying this request to the mail?
> >>
> >> However the result noted in this mail would be the expected response
> >> if the query would not return any results.
> >>
> >> On Mon, Aug 29, 2011 at 4:40 PM, David Riccitelli
> >> <da...@interact.it> wrote:
> >> > And then I have lots of these (at least 20):
> >> >
> >> > 29.08.2011 08:53:35.924 *INFO* [1605442425@qtp-23480987-1]
> >> > org.apache.stanbol.enhancer.servicesapi.helper.EnhancementEngineHelper
> >> > No
> >> > Triple found for
> <urn:enhancement-fa2cfb8d-5cad-5e80-ea03-b2b39be6f404>
> >> > and
> >> > property <http://purl.org/dc/terms/type>! -> return null
> >> > 29.08.2011 08:53:35.924 *WARN* [1605442425@qtp-23480987-1]
> >> >
> >> >
> org.apache.stanbol.enhancer.engines.entitytagging.impl.NamedEntityTaggingEngine
> >> > Unable to process TextAnnotation
> >> > <urn:enhancement-fa2cfb8d-5cad-5e80-ea03-b2b39be6f404> because
> property<
> >> > http://purl.org/dc/terms/type> is not present
> >> >
> >>
> >> Before processing TextAnnotations the NamedEntityTaggingEngine checks
> >> that the "dc:type" and "selected-text" properties are present for an
> >> TextAnnotations. So if you see such warnings there must be some other
> >> enhancement engine present that creates TextAnnotations that are
> >> missing the "dc:type" property.
> >>
> >> best
> >> Rupert Westenthaler
> >>
> >>
> >> --
> >> | Rupert Westenthaler rupert.westenthaler@gmail.com
> >> | Bodenlehenstraße 11 ++43-699-11108907
> >> | A-5500 Bischofshofen
> >
> >
> >
> > --
> > David Riccitelli
> > -----
> > Skype: ziodave
> > Twitter: @ziodave
> > LinkedIn: http://it.linkedin.com/in/riccitelli
> > -----
> > Interact SpA
> > Via A. Bargoni 78 (scala F)
> > 00153 Roma
> >
> > T +39 06 58318 301
> > F +39 06 58318 303
> >
>
>
>
> --
> | Rupert Westenthaler rupert.westenthaler@gmail.com
> | Bodenlehenstraße 11 ++43-699-11108907
> | A-5500 Bischofshofen
>
--
David Riccitelli
-----
Skype: ziodave
Twitter: @ziodave
LinkedIn: http://it.linkedin.com/in/riccitelli
-----
Interact SpA
Via A. Bargoni 78 (scala F)
00153 Roma
T +39 06 58318 301
F +39 06 58318 303
Re: exception
Posted by Rupert Westenthaler <ru...@gmail.com>.
On Tue, Aug 30, 2011 at 10:45 AM, David Riccitelli
<da...@interact.it> wrote:
> Thanks Rupert,
>>
>> So for me it looks like that the dbpedia.org SPARQL server has
>> currently some problems in writing JSON responses.
>
> According to you, if I would create an offline cache of DBpedia, would I be
> able to overcome this issue?
Queries are not supported by "caches". (cache strategy "used")
Only if you use local index (cache strategy "all") also queries are
exceeded on the locally available data.
You could simple go the the configuration tab of the Felix Web Console
(http://localhost:8080/system/console/configMgr), open the
configuration for the dbpedia Referenced Site and change the
configuration of the CacheStrategy from "used" to "all". After that
queries should be executed locally over the entities you have
previously cached from dbpedia.org.
best
Rupert Westenthaler
BTW: I forgot to mention in my last mail, that I am getting the exact
same JSONExceptions as you mentioned.
Caused by: org.apache.stanbol.entityhub.servicesapi.site.ReferencedSiteException:
Unable to execute query on remote site http://dbpedia.org/sparql with
entitySearcher org.apache.stanbol.entityhub.searcher.VirtuosoSearcher!
at org.apache.stanbol.entityhub.core.impl.ReferencedSiteImpl.findEntities(ReferencedSiteImpl.java:318)
at org.apache.stanbol.enhancer.engines.entitytagging.impl.NamedEntityTaggingEngine.computeEntityRecommentations(NamedEntityTaggingEngine.java:408)
at org.apache.stanbol.enhancer.engines.entitytagging.impl.NamedEntityTaggingEngine.computeEnhancements(NamedEntityTaggingEngine.java:320)
... 44 more
Caused by: java.io.IOException: Unable to parse JSON Result Set for parsed query
at org.apache.stanbol.entityhub.site.linkeddata.impl.SparqlSearcher.extractEntitiesFromJsonResult(SparqlSearcher.java:113)
at org.apache.stanbol.entityhub.site.linkeddata.impl.VirtuosoSearcher.findEntities(VirtuosoSearcher.java:92)
at org.apache.stanbol.entityhub.core.impl.ReferencedSiteImpl.findEntities(ReferencedSiteImpl.java:316)
... 46 more
Caused by: org.codehaus.jettison.json.JSONException: A JSONObject text
must begin with '{' at character 0 of
at org.codehaus.jettison.json.JSONTokener.syntaxError(JSONTokener.java:439)
at org.codehaus.jettison.json.JSONObject.<init>(JSONObject.java:169)
at org.codehaus.jettison.json.JSONObject.<init>(JSONObject.java:266)
at org.apache.stanbol.entityhub.site.linkeddata.impl.SparqlSearcher.extractEntitiesFromJsonResult(SparqlSearcher.java:87)
... 48 more
> BR
> David
> On Tue, Aug 30, 2011 at 11:39 AM, Rupert Westenthaler
> <ru...@gmail.com> wrote:
>>
>> Hi David
>>
>> On Mon, Aug 29, 2011 at 4:40 PM, David Riccitelli
>> <da...@interact.it> wrote:
>> > Hi Rupert,
>> >
>> > I think is this one:
>> >
>> > http://dbpedia.org/sparql?query=SELECT+DISTINCT+?id+%0AWHERE+%7B+%0A++%7B+%0A++++?id+%3Chttp://www.w3.org/1999/02/22-rdf-syntax-ns%23type%3E+%3Chttp://dbpedia.org/ontology/Person%3E+.+%0A++++?id+%3Chttp://www.w3.org/2000/01/rdf-schema%23label%3E+?tmp1+.+%0A++++++?tmp1+bif:contains+'%22Plantar%22'+.+%0A%7D+%0A%7D+%0AORDER+BY+DESC+(+%3CLONG::IRI_RANK%3E+(?id)+)+%0ALIMIT+20+%0A&format=application/sparql-results%2Bjson
>> >
>>
>> This corresponds to this SPARQL query:
>>
>> SELECT DISTINCT ?id
>> WHERE {
>> {
>> ?id <http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
>> <http://dbpedia.org/ontology/Person> .
>> ?id <http://www.w3.org/2000/01/rdf-schema#label> ?tmp1 .
>> ?tmp1 bif:contains '"Plantar"' .
>> }
>> }
>> ORDER BY DESC ( <LONG::IRI_RANK> (?id) )
>> LIMIT 20
>>
>> this is a typical query as used by the NamedEntityTaggingEngine to lookup
>> an Entity with the name "Plantar" for an TextAnnotation with the
>> dc:type dbpedia-ont:Person
>>
>> > In fact before that exception I have this one:
>> >
>> > 29.08.2011 08:51:54.939 *WARN* [1605442425@qtp-23480987-1]
>> > org.apache.felix.http.jetty /engines/
>> > (org.apache.stanbol.enhancer.servicesapi.EngineException:
>> > 'NamedEntityTaggingEngine' failed to process content item
>> > 'urn:content-item-sha1-feef2e6a8bb37b08ff71e7b2d27582ae4c640adb' with
>> > type
>> > 'text/plain':
>> > org.apache.stanbol.entityhub.servicesapi.site.ReferencedSiteException:
>> > Unable to execute query on remote site http://dbpedia.org/sparql with
>> > entitySearcher org.apache.stanbol.entityhub.searcher.VirtuosoSearcher!)
>> > org.apache.stanbol.enhancer.servicesapi.EngineException:
>> > 'NamedEntityTaggingEngine' failed to process content item
>> > 'urn:content-item-sha1-feef2e6a8bb37b08ff71e7b2d27582ae4c640adb' with
>> > type
>> > 'text/plain':
>> > org.apache.stanbol.entityhub.servicesapi.site.ReferencedSiteException:
>> > Unable to execute query on remote site http://dbpedia.org/sparql with
>> > entitySearcher org.apache.stanbol.entityhub.searcher.VirtuosoSearcher!
>> > (...)
>> > Caused by: java.io.IOException: Server returned HTTP response code: 500
>> > for
>> > URL:
>> >
>> > http://dbpedia.org/sparql?query=SELECT+DISTINCT+?id+%0AWHERE+%7B+%0A++%7B+%0A++++?id+%3Chttp://www.w3.org/1999/02/22-rdf-syntax-ns%23type%3E+%3Chttp://dbpedia.org/ontology/Person%3E+.+%0A++++?id+%3Chttp://www.w3.org/2000/01/rdf-schema%23label%3E+?tmp1+.+%0A++++++?tmp1+bif:contains+'%22Plantar%22'+.+%0A%7D+%0A%7D+%0AORDER+BY+DESC+(+%3CLONG::IRI_RANK%3E+(?id)+)+%0ALIMIT+20+%0A&format=application/sparql-results%2Bjson
>> > (...)
>> >
>> In the earlier mail you where getting a JSONException while praising
>> the response of a query. Here you are getting a 500 indicating the the
>> dbpedia SPARQL endpoint had some problems.
>>
>> Testing this query today resulted in a 200. However I could observe
>> strange behavior while testing.
>> Precisely: sending the above URL with curl -v printed the headers of
>> the response however after that the curl command has not terminated as
>> expected. It kept running until I manually terminated it.
>> Making the same request but without the
>> "&format=application/sparql-results%2Bjson" parameter I was also
>> getting a 200 (as expected) but this time curl terminated and printed
>>
>> <sparql xmlns="http://www.w3.org/2005/sparql-results#"
>> xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
>> xsi:schemaLocation="http://www.w3.org/2001/sw/DataAccess/rf1/result2.xsd">
>> <head>
>> <variable name="id"/>
>> </head>
>> <results distinct="false" ordered="true">
>> </results>
>> </sparql>
>>
>> ... an empty response.
>>
>> If I make a request with the above URL (including the
>> "&format=application/sparql-results%2Bjson") directly in the Browser I
>> get an empty response. As far as I know this would not be valid JSON
>> and could explain the JSONException as mentioned in the earlier mail.
>>
>> So for me it looks like that the dbpedia.org SPARQL server has
>> currently some problems in writing JSON responses.
>>
>> On Mon, Aug 29, 2011 at 4:51 PM, David Riccitelli
>> <da...@interact.it> wrote:
>> > If I run, $ curl "
>> >
>> > http://dbpedia.org/sparql?query=SELECT+DISTINCT+?id+%ntax-ns%23type%3E+%3Chttp://dbpedia.org/ontology/Person%3E+.+%0A++++?id+%3Chttp://www.w3.org/2000/01/rdf-schema%23label%3E+?tmp1+.+%0A++++++?tmp1+bif:contains+'%22Plantar%22'+.+%0A%7D+%0A%7D+%0AORDER+BY+DESC+(+%3CLONG::IRI_RANK%3E+(?id)+)+%0ALIMIT+20+%0A&format=application/sparql-results%2Bjson
>> > "
>> >
>> > I get a:
>> >
>> > { "head": { "link": [], "vars": ["id"] },
>> > "results": { "distinct": false, "ordered": true, "bindings": [ ] } }
>> >
>> I was not able to confirm this. The above URL is not an valid request
>> because
>>
>> SELECT+DISTINCT+?id+%ntax-ns%23type%3E+
>>
>> "%ntax-ns" is not valid. Could it be that you have missed some parts
>> when copying this request to the mail?
>>
>> However the result noted in this mail would be the expected response
>> if the query would not return any results.
>>
>> On Mon, Aug 29, 2011 at 4:40 PM, David Riccitelli
>> <da...@interact.it> wrote:
>> > And then I have lots of these (at least 20):
>> >
>> > 29.08.2011 08:53:35.924 *INFO* [1605442425@qtp-23480987-1]
>> > org.apache.stanbol.enhancer.servicesapi.helper.EnhancementEngineHelper
>> > No
>> > Triple found for <urn:enhancement-fa2cfb8d-5cad-5e80-ea03-b2b39be6f404>
>> > and
>> > property <http://purl.org/dc/terms/type>! -> return null
>> > 29.08.2011 08:53:35.924 *WARN* [1605442425@qtp-23480987-1]
>> >
>> > org.apache.stanbol.enhancer.engines.entitytagging.impl.NamedEntityTaggingEngine
>> > Unable to process TextAnnotation
>> > <urn:enhancement-fa2cfb8d-5cad-5e80-ea03-b2b39be6f404> because property<
>> > http://purl.org/dc/terms/type> is not present
>> >
>>
>> Before processing TextAnnotations the NamedEntityTaggingEngine checks
>> that the "dc:type" and "selected-text" properties are present for an
>> TextAnnotations. So if you see such warnings there must be some other
>> enhancement engine present that creates TextAnnotations that are
>> missing the "dc:type" property.
>>
>> best
>> Rupert Westenthaler
>>
>>
>> --
>> | Rupert Westenthaler rupert.westenthaler@gmail.com
>> | Bodenlehenstraße 11 ++43-699-11108907
>> | A-5500 Bischofshofen
>
>
>
> --
> David Riccitelli
> -----
> Skype: ziodave
> Twitter: @ziodave
> LinkedIn: http://it.linkedin.com/in/riccitelli
> -----
> Interact SpA
> Via A. Bargoni 78 (scala F)
> 00153 Roma
>
> T +39 06 58318 301
> F +39 06 58318 303
>
--
| Rupert Westenthaler rupert.westenthaler@gmail.com
| Bodenlehenstraße 11 ++43-699-11108907
| A-5500 Bischofshofen
Re: exception
Posted by David Riccitelli <da...@interact.it>.
Thanks Rupert,
So for me it looks like that the dbpedia.org SPARQL server has
> currently some problems in writing JSON responses.
According to you, if I would create an offline cache of DBpedia, would I be
able to overcome this issue?
BR
David
On Tue, Aug 30, 2011 at 11:39 AM, Rupert Westenthaler <
rupert.westenthaler@gmail.com> wrote:
> Hi David
>
> On Mon, Aug 29, 2011 at 4:40 PM, David Riccitelli
> <da...@interact.it> wrote:
> > Hi Rupert,
> >
> > I think is this one:
> >
> http://dbpedia.org/sparql?query=SELECT+DISTINCT+?id+%0AWHERE+%7B+%0A++%7B+%0A++++?id+%3Chttp://www.w3.org/1999/02/22-rdf-syntax-ns%23type%3E+%3Chttp://dbpedia.org/ontology/Person%3E+.+%0A++++?id+%3Chttp://www.w3.org/2000/01/rdf-schema%23label%3E+?tmp1+.+%0A++++++?tmp1+bif:contains+'%22Plantar%22'+.+%0A%7D+%0A%7D+%0AORDER+BY+DESC+(+%3CLONG::IRI_RANK%3E+(?id)+)+%0ALIMIT+20+%0A&format=application/sparql-results%2Bjson
> >
>
> This corresponds to this SPARQL query:
>
> SELECT DISTINCT ?id
> WHERE {
> {
> ?id <http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
> <http://dbpedia.org/ontology/Person> .
> ?id <http://www.w3.org/2000/01/rdf-schema#label> ?tmp1 .
> ?tmp1 bif:contains '"Plantar"' .
> }
> }
> ORDER BY DESC ( <LONG::IRI_RANK> (?id) )
> LIMIT 20
>
> this is a typical query as used by the NamedEntityTaggingEngine to lookup
> an Entity with the name "Plantar" for an TextAnnotation with the
> dc:type dbpedia-ont:Person
>
> > In fact before that exception I have this one:
> >
> > 29.08.2011 08:51:54.939 *WARN* [1605442425@qtp-23480987-1]
> > org.apache.felix.http.jetty /engines/
> > (org.apache.stanbol.enhancer.servicesapi.EngineException:
> > 'NamedEntityTaggingEngine' failed to process content item
> > 'urn:content-item-sha1-feef2e6a8bb37b08ff71e7b2d27582ae4c640adb' with
> type
> > 'text/plain':
> > org.apache.stanbol.entityhub.servicesapi.site.ReferencedSiteException:
> > Unable to execute query on remote site http://dbpedia.org/sparql with
> > entitySearcher org.apache.stanbol.entityhub.searcher.VirtuosoSearcher!)
> > org.apache.stanbol.enhancer.servicesapi.EngineException:
> > 'NamedEntityTaggingEngine' failed to process content item
> > 'urn:content-item-sha1-feef2e6a8bb37b08ff71e7b2d27582ae4c640adb' with
> type
> > 'text/plain':
> > org.apache.stanbol.entityhub.servicesapi.site.ReferencedSiteException:
> > Unable to execute query on remote site http://dbpedia.org/sparql with
> > entitySearcher org.apache.stanbol.entityhub.searcher.VirtuosoSearcher!
> > (...)
> > Caused by: java.io.IOException: Server returned HTTP response code: 500
> for
> > URL:
> >
> http://dbpedia.org/sparql?query=SELECT+DISTINCT+?id+%0AWHERE+%7B+%0A++%7B+%0A++++?id+%3Chttp://www.w3.org/1999/02/22-rdf-syntax-ns%23type%3E+%3Chttp://dbpedia.org/ontology/Person%3E+.+%0A++++?id+%3Chttp://www.w3.org/2000/01/rdf-schema%23label%3E+?tmp1+.+%0A++++++?tmp1+bif:contains+'%22Plantar%22'+.+%0A%7D+%0A%7D+%0AORDER+BY+DESC+(+%3CLONG::IRI_RANK%3E+(?id)+)+%0ALIMIT+20+%0A&format=application/sparql-results%2Bjson
> > (...)
> >
> In the earlier mail you where getting a JSONException while praising
> the response of a query. Here you are getting a 500 indicating the the
> dbpedia SPARQL endpoint had some problems.
>
> Testing this query today resulted in a 200. However I could observe
> strange behavior while testing.
> Precisely: sending the above URL with curl -v printed the headers of
> the response however after that the curl command has not terminated as
> expected. It kept running until I manually terminated it.
> Making the same request but without the
> "&format=application/sparql-results%2Bjson" parameter I was also
> getting a 200 (as expected) but this time curl terminated and printed
>
> <sparql xmlns="http://www.w3.org/2005/sparql-results#"
> xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
> xsi:schemaLocation="http://www.w3.org/2001/sw/DataAccess/rf1/result2.xsd">
> <head>
> <variable name="id"/>
> </head>
> <results distinct="false" ordered="true">
> </results>
> </sparql>
>
> ... an empty response.
>
> If I make a request with the above URL (including the
> "&format=application/sparql-results%2Bjson") directly in the Browser I
> get an empty response. As far as I know this would not be valid JSON
> and could explain the JSONException as mentioned in the earlier mail.
>
> So for me it looks like that the dbpedia.org SPARQL server has
> currently some problems in writing JSON responses.
>
> On Mon, Aug 29, 2011 at 4:51 PM, David Riccitelli
> <da...@interact.it> wrote:
> > If I run, $ curl "
> >
> http://dbpedia.org/sparql?query=SELECT+DISTINCT+?id+%ntax-ns%23type%3E+%3Chttp://dbpedia.org/ontology/Person%3E+.+%0A++++?id+%3Chttp://www.w3.org/2000/01/rdf-schema%23label%3E+?tmp1+.+%0A++++++?tmp1+bif:contains+'%22Plantar%22'+.+%0A%7D+%0A%7D+%0AORDER+BY+DESC+(+%3CLONG::IRI_RANK%3E+(?id)+)+%0ALIMIT+20+%0A&format=application/sparql-results%2Bjson
> > "
> >
> > I get a:
> >
> > { "head": { "link": [], "vars": ["id"] },
> > "results": { "distinct": false, "ordered": true, "bindings": [ ] } }
> >
> I was not able to confirm this. The above URL is not an valid request
> because
>
> SELECT+DISTINCT+?id+%ntax-ns%23type%3E+
>
> "%ntax-ns" is not valid. Could it be that you have missed some parts
> when copying this request to the mail?
>
> However the result noted in this mail would be the expected response
> if the query would not return any results.
>
> On Mon, Aug 29, 2011 at 4:40 PM, David Riccitelli
> <da...@interact.it> wrote:
> > And then I have lots of these (at least 20):
> >
> > 29.08.2011 08:53:35.924 *INFO* [1605442425@qtp-23480987-1]
> > org.apache.stanbol.enhancer.servicesapi.helper.EnhancementEngineHelper No
> > Triple found for <urn:enhancement-fa2cfb8d-5cad-5e80-ea03-b2b39be6f404>
> and
> > property <http://purl.org/dc/terms/type>! -> return null
> > 29.08.2011 08:53:35.924 *WARN* [1605442425@qtp-23480987-1]
> >
> org.apache.stanbol.enhancer.engines.entitytagging.impl.NamedEntityTaggingEngine
> > Unable to process TextAnnotation
> > <urn:enhancement-fa2cfb8d-5cad-5e80-ea03-b2b39be6f404> because property<
> > http://purl.org/dc/terms/type> is not present
> >
>
> Before processing TextAnnotations the NamedEntityTaggingEngine checks
> that the "dc:type" and "selected-text" properties are present for an
> TextAnnotations. So if you see such warnings there must be some other
> enhancement engine present that creates TextAnnotations that are
> missing the "dc:type" property.
>
> best
> Rupert Westenthaler
>
>
> --
> | Rupert Westenthaler rupert.westenthaler@gmail.com
> | Bodenlehenstraße 11 ++43-699-11108907
> | A-5500 Bischofshofen
>
--
David Riccitelli
-----
Skype: ziodave
Twitter: @ziodave
LinkedIn: http://it.linkedin.com/in/riccitelli
-----
Interact SpA
Via A. Bargoni 78 (scala F)
00153 Roma
T +39 06 58318 301
F +39 06 58318 303
Re: exception
Posted by Rupert Westenthaler <ru...@gmail.com>.
Hi David
On Mon, Aug 29, 2011 at 4:40 PM, David Riccitelli
<da...@interact.it> wrote:
> Hi Rupert,
>
> I think is this one:
> http://dbpedia.org/sparql?query=SELECT+DISTINCT+?id+%0AWHERE+%7B+%0A++%7B+%0A++++?id+%3Chttp://www.w3.org/1999/02/22-rdf-syntax-ns%23type%3E+%3Chttp://dbpedia.org/ontology/Person%3E+.+%0A++++?id+%3Chttp://www.w3.org/2000/01/rdf-schema%23label%3E+?tmp1+.+%0A++++++?tmp1+bif:contains+'%22Plantar%22'+.+%0A%7D+%0A%7D+%0AORDER+BY+DESC+(+%3CLONG::IRI_RANK%3E+(?id)+)+%0ALIMIT+20+%0A&format=application/sparql-results%2Bjson
>
This corresponds to this SPARQL query:
SELECT DISTINCT ?id
WHERE {
{
?id <http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<http://dbpedia.org/ontology/Person> .
?id <http://www.w3.org/2000/01/rdf-schema#label> ?tmp1 .
?tmp1 bif:contains '"Plantar"' .
}
}
ORDER BY DESC ( <LONG::IRI_RANK> (?id) )
LIMIT 20
this is a typical query as used by the NamedEntityTaggingEngine to lookup
an Entity with the name "Plantar" for an TextAnnotation with the
dc:type dbpedia-ont:Person
> In fact before that exception I have this one:
>
> 29.08.2011 08:51:54.939 *WARN* [1605442425@qtp-23480987-1]
> org.apache.felix.http.jetty /engines/
> (org.apache.stanbol.enhancer.servicesapi.EngineException:
> 'NamedEntityTaggingEngine' failed to process content item
> 'urn:content-item-sha1-feef2e6a8bb37b08ff71e7b2d27582ae4c640adb' with type
> 'text/plain':
> org.apache.stanbol.entityhub.servicesapi.site.ReferencedSiteException:
> Unable to execute query on remote site http://dbpedia.org/sparql with
> entitySearcher org.apache.stanbol.entityhub.searcher.VirtuosoSearcher!)
> org.apache.stanbol.enhancer.servicesapi.EngineException:
> 'NamedEntityTaggingEngine' failed to process content item
> 'urn:content-item-sha1-feef2e6a8bb37b08ff71e7b2d27582ae4c640adb' with type
> 'text/plain':
> org.apache.stanbol.entityhub.servicesapi.site.ReferencedSiteException:
> Unable to execute query on remote site http://dbpedia.org/sparql with
> entitySearcher org.apache.stanbol.entityhub.searcher.VirtuosoSearcher!
> (...)
> Caused by: java.io.IOException: Server returned HTTP response code: 500 for
> URL:
> http://dbpedia.org/sparql?query=SELECT+DISTINCT+?id+%0AWHERE+%7B+%0A++%7B+%0A++++?id+%3Chttp://www.w3.org/1999/02/22-rdf-syntax-ns%23type%3E+%3Chttp://dbpedia.org/ontology/Person%3E+.+%0A++++?id+%3Chttp://www.w3.org/2000/01/rdf-schema%23label%3E+?tmp1+.+%0A++++++?tmp1+bif:contains+'%22Plantar%22'+.+%0A%7D+%0A%7D+%0AORDER+BY+DESC+(+%3CLONG::IRI_RANK%3E+(?id)+)+%0ALIMIT+20+%0A&format=application/sparql-results%2Bjson
> (...)
>
In the earlier mail you where getting a JSONException while praising
the response of a query. Here you are getting a 500 indicating the the
dbpedia SPARQL endpoint had some problems.
Testing this query today resulted in a 200. However I could observe
strange behavior while testing.
Precisely: sending the above URL with curl -v printed the headers of
the response however after that the curl command has not terminated as
expected. It kept running until I manually terminated it.
Making the same request but without the
"&format=application/sparql-results%2Bjson" parameter I was also
getting a 200 (as expected) but this time curl terminated and printed
<sparql xmlns="http://www.w3.org/2005/sparql-results#"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.w3.org/2001/sw/DataAccess/rf1/result2.xsd">
<head>
<variable name="id"/>
</head>
<results distinct="false" ordered="true">
</results>
</sparql>
... an empty response.
If I make a request with the above URL (including the
"&format=application/sparql-results%2Bjson") directly in the Browser I
get an empty response. As far as I know this would not be valid JSON
and could explain the JSONException as mentioned in the earlier mail.
So for me it looks like that the dbpedia.org SPARQL server has
currently some problems in writing JSON responses.
On Mon, Aug 29, 2011 at 4:51 PM, David Riccitelli
<da...@interact.it> wrote:
> If I run, $ curl "
> http://dbpedia.org/sparql?query=SELECT+DISTINCT+?id+%ntax-ns%23type%3E+%3Chttp://dbpedia.org/ontology/Person%3E+.+%0A++++?id+%3Chttp://www.w3.org/2000/01/rdf-schema%23label%3E+?tmp1+.+%0A++++++?tmp1+bif:contains+'%22Plantar%22'+.+%0A%7D+%0A%7D+%0AORDER+BY+DESC+(+%3CLONG::IRI_RANK%3E+(?id)+)+%0ALIMIT+20+%0A&format=application/sparql-results%2Bjson
> "
>
> I get a:
>
> { "head": { "link": [], "vars": ["id"] },
> "results": { "distinct": false, "ordered": true, "bindings": [ ] } }
>
I was not able to confirm this. The above URL is not an valid request because
SELECT+DISTINCT+?id+%ntax-ns%23type%3E+
"%ntax-ns" is not valid. Could it be that you have missed some parts
when copying this request to the mail?
However the result noted in this mail would be the expected response
if the query would not return any results.
On Mon, Aug 29, 2011 at 4:40 PM, David Riccitelli
<da...@interact.it> wrote:
> And then I have lots of these (at least 20):
>
> 29.08.2011 08:53:35.924 *INFO* [1605442425@qtp-23480987-1]
> org.apache.stanbol.enhancer.servicesapi.helper.EnhancementEngineHelper No
> Triple found for <urn:enhancement-fa2cfb8d-5cad-5e80-ea03-b2b39be6f404> and
> property <http://purl.org/dc/terms/type>! -> return null
> 29.08.2011 08:53:35.924 *WARN* [1605442425@qtp-23480987-1]
> org.apache.stanbol.enhancer.engines.entitytagging.impl.NamedEntityTaggingEngine
> Unable to process TextAnnotation
> <urn:enhancement-fa2cfb8d-5cad-5e80-ea03-b2b39be6f404> because property<
> http://purl.org/dc/terms/type> is not present
>
Before processing TextAnnotations the NamedEntityTaggingEngine checks
that the "dc:type" and "selected-text" properties are present for an
TextAnnotations. So if you see such warnings there must be some other
enhancement engine present that creates TextAnnotations that are
missing the "dc:type" property.
best
Rupert Westenthaler
--
| Rupert Westenthaler rupert.westenthaler@gmail.com
| Bodenlehenstraße 11 ++43-699-11108907
| A-5500 Bischofshofen
Re: exception
Posted by David Riccitelli <da...@interact.it>.
Hi Rupert,
I think is this one:
http://dbpedia.org/sparql?query=SELECT+DISTINCT+?id+%0AWHERE+%7B+%0A++%7B+%0A++++?id+%3Chttp://www.w3.org/1999/02/22-rdf-syntax-ns%23type%3E+%3Chttp://dbpedia.org/ontology/Person%3E+.+%0A++++?id+%3Chttp://www.w3.org/2000/01/rdf-schema%23label%3E+?tmp1+.+%0A++++++?tmp1+bif:contains+'%22Plantar%22'+.+%0A%7D+%0A%7D+%0AORDER+BY+DESC+(+%3CLONG::IRI_RANK%3E+(?id)+)+%0ALIMIT+20+%0A&format=application/sparql-results%2Bjson
In fact before that exception I have this one:
29.08.2011 08:51:54.939 *WARN* [1605442425@qtp-23480987-1]
org.apache.felix.http.jetty /engines/
(org.apache.stanbol.enhancer.servicesapi.EngineException:
'NamedEntityTaggingEngine' failed to process content item
'urn:content-item-sha1-feef2e6a8bb37b08ff71e7b2d27582ae4c640adb' with type
'text/plain':
org.apache.stanbol.entityhub.servicesapi.site.ReferencedSiteException:
Unable to execute query on remote site http://dbpedia.org/sparql with
entitySearcher org.apache.stanbol.entityhub.searcher.VirtuosoSearcher!)
org.apache.stanbol.enhancer.servicesapi.EngineException:
'NamedEntityTaggingEngine' failed to process content item
'urn:content-item-sha1-feef2e6a8bb37b08ff71e7b2d27582ae4c640adb' with type
'text/plain':
org.apache.stanbol.entityhub.servicesapi.site.ReferencedSiteException:
Unable to execute query on remote site http://dbpedia.org/sparql with
entitySearcher org.apache.stanbol.entityhub.searcher.VirtuosoSearcher!
(...)
Caused by: java.io.IOException: Server returned HTTP response code: 500 for
URL:
http://dbpedia.org/sparql?query=SELECT+DISTINCT+?id+%0AWHERE+%7B+%0A++%7B+%0A++++?id+%3Chttp://www.w3.org/1999/02/22-rdf-syntax-ns%23type%3E+%3Chttp://dbpedia.org/ontology/Person%3E+.+%0A++++?id+%3Chttp://www.w3.org/2000/01/rdf-schema%23label%3E+?tmp1+.+%0A++++++?tmp1+bif:contains+'%22Plantar%22'+.+%0A%7D+%0A%7D+%0AORDER+BY+DESC+(+%3CLONG::IRI_RANK%3E+(?id)+)+%0ALIMIT+20+%0A&format=application/sparql-results%2Bjson
(...)
And then I have lots of these (at least 20):
29.08.2011 08:53:35.924 *INFO* [1605442425@qtp-23480987-1]
org.apache.stanbol.enhancer.servicesapi.helper.EnhancementEngineHelper No
Triple found for <urn:enhancement-fa2cfb8d-5cad-5e80-ea03-b2b39be6f404> and
property <http://purl.org/dc/terms/type>! -> return null
29.08.2011 08:53:35.924 *WARN* [1605442425@qtp-23480987-1]
org.apache.stanbol.enhancer.engines.entitytagging.impl.NamedEntityTaggingEngine
Unable to process TextAnnotation
<urn:enhancement-fa2cfb8d-5cad-5e80-ea03-b2b39be6f404> because property<
http://purl.org/dc/terms/type> is not present
Thanks!
David
On Mon, Aug 29, 2011 at 4:44 PM, Rupert Westenthaler <
rupert.westenthaler@gmail.com> wrote:
> Hi David
>
> To me it looks like that the SPARQL endpoint of dbpedia does not
> return valid JSON as results of a SPARQL CONSTRUCT query.
>
> I think in the error.log file (/sling/logs/error.log) should provide
> some additional information (such as the query sent to
> "http://dbpedia.org/sparql".
> You could e.g. use your browser to see the returned results yourself.
> If you provide such information I could also make some tests and help.
>
> best
> Rupert
>
> On Mon, Aug 29, 2011 at 11:20 AM, Bertrand Delacretaz
> <bd...@apache.org> wrote:
> > Hi David,
> >
> > On Mon, Aug 29, 2011 at 10:58 AM, David Riccitelli
> > <da...@interact.it> wrote:
> >> ...I'm having an issue with Stanbol (r1153390), the analysis of a text
> fails
> >> 100% of the times with an exception. The root cause seems to
> >> be: org.codehaus.jettison.json.JSONException: A JSONObject text must
> begin
> >> with '{' at character 0 of
> >>
> >> but how do I track down the issue?...
> >
> > Seems like it's happening here:
> >
> > org.apache.stanbol.entityhub.servicesapi.site.ReferencedSiteException:
> > Unable to execute query on remote site http://dbpedia.org/sparql with
> > entitySearcher org.apache.stanbol.entityhub.searcher.VirtuosoSearcher!...
> >
> > I'd try debugging that VirtuosoSearcher and especially have a look a
> > that what sparql endpoint is returning.
> >
> > -Bertrand
> >
>
>
>
> --
> | Rupert Westenthaler rupert.westenthaler@gmail.com
> | Bodenlehenstraße 11 ++43-699-11108907
> | A-5500 Bischofshofen
>
--
David Riccitelli
-----
Skype: ziodave
Twitter: @ziodave
LinkedIn: http://it.linkedin.com/in/riccitelli
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Interact SpA
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Re: exception
Posted by Rupert Westenthaler <ru...@gmail.com>.
Hi David
To me it looks like that the SPARQL endpoint of dbpedia does not
return valid JSON as results of a SPARQL CONSTRUCT query.
I think in the error.log file (/sling/logs/error.log) should provide
some additional information (such as the query sent to
"http://dbpedia.org/sparql".
You could e.g. use your browser to see the returned results yourself.
If you provide such information I could also make some tests and help.
best
Rupert
On Mon, Aug 29, 2011 at 11:20 AM, Bertrand Delacretaz
<bd...@apache.org> wrote:
> Hi David,
>
> On Mon, Aug 29, 2011 at 10:58 AM, David Riccitelli
> <da...@interact.it> wrote:
>> ...I'm having an issue with Stanbol (r1153390), the analysis of a text fails
>> 100% of the times with an exception. The root cause seems to
>> be: org.codehaus.jettison.json.JSONException: A JSONObject text must begin
>> with '{' at character 0 of
>>
>> but how do I track down the issue?...
>
> Seems like it's happening here:
>
> org.apache.stanbol.entityhub.servicesapi.site.ReferencedSiteException:
> Unable to execute query on remote site http://dbpedia.org/sparql with
> entitySearcher org.apache.stanbol.entityhub.searcher.VirtuosoSearcher!...
>
> I'd try debugging that VirtuosoSearcher and especially have a look a
> that what sparql endpoint is returning.
>
> -Bertrand
>
--
| Rupert Westenthaler rupert.westenthaler@gmail.com
| Bodenlehenstraße 11 ++43-699-11108907
| A-5500 Bischofshofen
Re: exception
Posted by Bertrand Delacretaz <bd...@apache.org>.
Hi David,
On Mon, Aug 29, 2011 at 10:58 AM, David Riccitelli
<da...@interact.it> wrote:
> ...I'm having an issue with Stanbol (r1153390), the analysis of a text fails
> 100% of the times with an exception. The root cause seems to
> be: org.codehaus.jettison.json.JSONException: A JSONObject text must begin
> with '{' at character 0 of
>
> but how do I track down the issue?...
Seems like it's happening here:
org.apache.stanbol.entityhub.servicesapi.site.ReferencedSiteException:
Unable to execute query on remote site http://dbpedia.org/sparql with
entitySearcher org.apache.stanbol.entityhub.searcher.VirtuosoSearcher!...
I'd try debugging that VirtuosoSearcher and especially have a look a
that what sparql endpoint is returning.
-Bertrand