Re: 303 See Other, Riot

Andy Seaborne Fri, 20 Jan 2017 03:25:53 -0800


On 20/01/17 08:33, Jean-Marc Vanel wrote:

Haaa, I got it !
jena-3.1.0 brings the exception, jena-3.1.1 does not .


I used the head of development.

So whatever it is, it is working now.

    Andy


cd ~/apps/apache-jena-3.1.0 ; JENA= ; for f in lib/*; do JENA=$JENA:$f;
done ; javac -cp $JENA ReadMgr.java ; java -cp $JENA ReadMgr
log4j:WARN No appenders could be found for logger (Jena).
log4j:WARN Please initialize the log4j system properly.
log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for
more info.
*org.apache.jena.riot.RiotException: [line: 1863, col: 13] Failed to find a
prefix name or keyword: –(8211;0x2013)*


2017-01-20 9:18 GMT+01:00 Jean-Marc Vanel <[email protected]>:



2017-01-19 22:26 GMT+01:00 Andy Seaborne <[email protected]>:

I get the parse error message with that code.


This is strange. I can't think of a reason for this difference in
execution. My impression is that the exceptions worked some weeks or a few
months ago. And what has changed since is the Ubuntu OS updates.

I tried both these Java JDK:

$   java -version
openjdk version "1.8.0_111"
OpenJDK Runtime Environment (build 1.8.0_111-8u111-b14-2ubuntu0.1
6.10.2-b14)
OpenJDK 64-Bit Server VM (build 25.111-b14, mixed mode)

java -version
java version "1.8.0_121"
Java(TM) SE Runtime Environment (build 1.8.0_121-b13)
Java HotSpot(TM) 64-Bit Server VM (build 25.121-b13, mixed mode)

My OS is
uname -a
Linux jmv-SMBIOSation 4.8.0-34-generic #36-Ubuntu SMP Wed Dec 21 17:24:18
UTC 2016 x86_64 x86_64 x86_64 GNU/Linux


Instead of working in a Scala eclipse environment, I downloaded a fresh
Jena 3.1.1, and tried again: SAME THING !

cd ~/apps/apache-jena-3.1.1
for f in lib/*; do JENA=$JENA:$f; done
javac -cp $JENA ReadMgr.java
java  -cp $JENA ReadMgr
log4j:WARN No appenders could be found for logger (Jena).
log4j:WARN Please initialize the log4j system properly.
log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for
more info.
*size 0*

You can force the use of, say RDF/XML, by opening the connection directly

with HttpOp.  You then have to tell the parse the syntax and base URI:


This I will do systematically, because as you explained , Turtle is
fragile. But of course, I must understand why the exception does not occur,
and the reading also does not occur.

try {
    Graph g = GraphFactory.createDefaultGraph();
    String uri = "http://dbpedia.org/resource/Rome";;
    try ( TypedInputStream in = HttpOp.execHttpGet(uri,
"application/rdf+xml") ) {
        RDFDataMgr.read(g, in, uri, Lang.RDFXML);
    }
    System.out.println("size " + g.size());
} catch (Throwable e) {
    System.err.println(e);
}

==>

size 8142

        Andy


On 19/01/17 16:52, Jean-Marc Vanel wrote:

import org.apache.jena.graph.Graph;
import org.apache.jena.riot.RDFDataMgr;

public class ReadMgr {
    public static void main(String[] args) {
        try {
            Graph g = RDFDataMgr.loadGraph("http://d
bpedia.org/resource/Rome
");
            System.out.println("size " + g.size());
        } catch (Throwable e) {
            System.err.println(e);
        }
    }
}



--
Jean-Marc Vanel
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Re: 303 See Other, Riot

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