Hi
I have some problems with d2rq+jena API examples (http://d2rq.org/jena).
The first two example codes run OK:
4. Using D2RQ with Jena's Model API # OK
5. Using D2RQ with Jena's Graph API # OK
PROBLEM 1 WITH Example 6:
-------------------------
But when I try to run the example:
6. Executing SPARQL queries against a ModelD2RQ #
at Eclipse platform (Windows7) I get the java.lang.StackOverflowError
message:
13:29:14 DEBUG ConnectedDB :: Keep alive agent is enabled
(interval: 3600 seconds, noop query: 'SELECT 1').
Exception in thread "main" java.lang.StackOverflowError
at java.nio.CharBuffer.charAt(Unknown Source)
at java.nio.StringCharBuffer.get(Unknown Source)
at sun.nio.cs.UTF_8$Encoder.encodeBufferLoop(Unknown Source)
at sun.nio.cs.UTF_8$Encoder.encodeLoop(Unknown Source)
at java.nio.charset.CharsetEncoder.encode(Unknown Source)
at org.openjena.atlas.lib.Bytes.toByteBuffer(Bytes.java:285)
at org.openjena.atlas.lib.Bytes.toByteBuffer(Bytes.java:274)
at
org.openjena.atlas.io.BufferingWriter.output(BufferingWriter.java:139)
at
org.openjena.atlas.io.BufferingWriter.output(BufferingWriter.java:150)
at
org.openjena.atlas.io.BufferingWriter.output(BufferingWriter.java:171)
....
I have increased vm stack size up to -Xss1024k but it didn't help.
Daniel had somekind of problem with these examples that was related to a
missing jar-file. He wrote in mail "[d2rq-dev] listStatements problem,
missing jar file"
>Another problem I had was that concurrent.jar was missing (problem
>solved by downloading it, but I thought you'd like to know).
>Daniel Elenius
If this is the solution, where can I download a correct version of
concurrent.jar appropriate for java 1.6? I didn't find it from jena jars?
PROBLEM 2 WITH Example 7:
-------------------------
And next, when I try to run the example:
7. The D2RQ Assembler #
Following error messages occur:
*Exception in thread "main"
com.hp.hpl.jena.shared.DoesNotExistException:
http://www.wiwiss.fu-berlin.de/suhl/bizer/D2RQ/0.1#
* at com.hp.hpl.jena.rdf.arp.JenaReader.read(JenaReader.java:104)
and next time I got a little further in execution with error message as:
*Exception in thread "main" com.hp.hpl.jena.shared.JenaException:
java.net.ConnectException: Connection refused: connect
at com.hp.hpl.jena.rdf.arp.JenaReader.read(JenaReader.java:106)
at com.hp.hpl.jena.rdf.model.impl.ModelCom.read(ModelCom.java:223)
The problem might be in the assembler.ttl file content copied from the
example page. So, jena can't import the d2rq.rdf from the
url:<http://www.wiwiss.fu-berlin.de/suhl/bizer/D2RQ/0.1#>
My assembler.ttl content:
------------------------
@prefix : <#> .
@prefix ja: <http://jena.hpl.hp.com/2005/11/Assembler#> .
@prefix d2rq: <http://www.wiwiss.fu-berlin.de/suhl/bizer/D2RQ/0.1#> .
<> ja:imports d2rq: .
:myModel
a d2rq:D2RQModel;
d2rq:mappingFile <mapping-iswc.ttl>;
d2rq:resourceBaseURI <http://localhost:2020/>;
.
-------------------------
How should I edit this ttl-code so that it imports the d2rq rdf-file
from my local PC? Sure, I have to study jena assembler a little in order
to understand this example better.
Thanks in advanced
Pekka Aarnio
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