>> But i have given the type as xsd:dateTime, so it should take it right?
The computer says otherwise.
>>myfn:LastModified(?r) >
>> "2005-11-06T00:00:00Z"^^xsd:dateTime )
"2005-11-06T00:00:00Z"^^xsd:dateTime is OK
>> "1969-12-31T19:00:00"^^xsd:date
Not OK. Find out where "1969-12-31T19:00:00" comes from. Is it in the data?
Andy
On 10/08/18 06:53, Lorenz Buehmann wrote:
which type? in the function or in the data? both have to match, there is
no implicit conversion I guess.
On 09.08.2018 21:29, Arunkumar Krishnamoorthy wrote:
But i have given the type as xsd:dateTime, so it should take it right?
On Thu, Aug 9, 2018 at 3:24 PM, ajs6f <[email protected]> wrote:
13:44:11 WARN NodeValue :: Datatype format exception:
"1969-12-31T19:00:00"^^xsd:date
No, Jena is just telling you (quite correctly) that "1969-12-31T19:00:00"
is not an xsd:date. Notice the time that is included. xsd:date does not
include time.
ajs6f
On Aug 9, 2018, at 2:35 PM, Arunkumar Krishnamoorthy <[email protected]>
wrote:
Hello Andy,
I am getting the below error when i run the query against the dataset
shared with you,
PREFIX myfn: <java:samplejena.>
PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
PREFIX dc: <http://purl.org/dc/elements/1.1/>
PREFIX xsd: <http://www.w3.org/2001/XMLSchema#>
SELECT ?title ?r
WHERE {
?s rdfs:seeAlso ?r.
OPTIONAL {?r dc:title ?title.}
FILTER ( isURI(?r) &&
myfn:LastModified(?r) >
"2005-11-06T00:00:00Z"^^xsd:dateTime )
}
13:44:11 WARN NodeValue :: Datatype format exception:
"1969-12-31T19:00:00"^^xsd:date
Is this because of any old version or something?
On Thu, Aug 9, 2018 at 6:34 AM, Andy Seaborne <[email protected]> wrote:
Good question - there is still a noticeable tail of com.hp.hpl, here and
on Stackoverflow.
Some is due to old apps; that is good in that the software is useful
enough to be used for such a long time.
I suspect that some of the rest is university courses providing the
materials that have not been updated.
(Jena3 was 2015-07-29)
Andy
On 09/08/18 06:48, Lorenz Buehmann wrote:
I'm always wondering how people that are new to Apache Jena still use
the old version. I mean, the first hit via Google is the Apache Jena
webpage which clearly refers to the latest version.
In the current case, he just copied the code example from [1] which
indeed uses the old version given that the blog entry is from 2005.
Well, at this time I didn't know about Semantic Web at all...
[1] http://www.ldodds.com/projects/sparql/LastModified.txt
On 08.08.2018 22:14, Andy Seaborne wrote:
com.hp.hpl.jena -- that's Jena2.
Packages are "org.apache.jena" in Jena3.
The code seems to have been compiled against Jena2 and run against
Jena3. That won't work.
Andy
On 08/08/18 18:14, Arunkumar Krishnamoorthy wrote:
The java code i am executing is,
package samplejena;
import com.hp.hpl.jena.query.expr.NodeValue;
import com.hp.hpl.jena.query.function.FunctionBase1;
import java.net.*;
import java.text.SimpleDateFormat;
import java.util.*;
public class LastModified extends FunctionBase1
{
private static final SimpleDateFormat format = new
SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss");
private Map _cache;
public LastModified()
{
_cache = new HashMap();
}
public NodeValue exec(NodeValue nodeValue)
{
String value = nodeValue.asString();
if (_cache.containsKey(value))
{
return (NodeValue)_cache.get(value);
}
String lastModified = "";
try {
lastModified = getLastModified( nodeValue.asString() );
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
NodeValue date = NodeValue.makeDate(lastModified);
_cache.put(value, date);
return date;
}
public String getLastModified(String link) throws Exception
{
URL url = new URL(link);
URLConnection connection = url.openConnection();
connection.setAllowUserInteraction(false);
long secs = connection.getLastModified();
String xsdDate = dateToXSD(secs);
return xsdDate;
}
public String dateToXSD(long secs)
{
Date date = new Date(secs);
return format.format(date);
}
}
On Wed, Aug 8, 2018 at 1:14 PM, Arunkumar Krishnamoorthy
<[email protected]>
wrote:
Hello Andy,
I am getting the following issue when i run the code,
Caused by: java.lang.ClassNotFoundException: com.hp.hpl.jena.query.
function.FunctionBase1
at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.j
I have added the .class file in the directory. Do i need to package
the
dependancy jars also? Please advice.
Regards,
Arun
On Tue, Aug 7, 2018 at 2:11 PM, Arunkumar Krishnamoorthy <
[email protected]> wrote:
It is executing now Andy. Thanks a lot. I missed to add the
directory.
Thanks again for this help.
On Tue, Aug 7, 2018 at 2:06 PM, Andy Seaborne <[email protected]>
wrote:
On 07/08/18 18:07, Arunkumar Krishnamoorthy wrote:
So my JENA_CP
is JENA_CP='/home/ak/Downloads/apache-jena-3.8.0/lib/*:/home/ak
/Documents'.
Does the file
/home/ak/Documents/samplejena/LastModified.class
exist?
/home/ak/Documents location has the classfile/jar of the code
But still when i run this command,
/home/ak/Downloads/apache-jena-3.8.0/bin/arq --data
/home/ak/Desktop/dataset.rdf --query /home/ak/Desktop/query.rq
I am getting the below error,
ak@akrish12:~$ /home/ak/Downloads/apache-jena-3.8.0/bin/arq
--data
/home/ak/Desktop/dataset.rdf --query /home/ak/Desktop/query.rq
12:41:35 WARN ClsLoader :: Class not found:
samplejena.LastModified
12:41:35 WARN exec :: URI
<java:samplejena.LastModified>
has no registered function factory
-------------
| title | r |
=============
-------------
Regards,
Arun
On Tue, Aug 7, 2018 at 12:20 PM, Andy Seaborne <[email protected]>
wrote:
The list doesn't accept attachments.
JENA_CP="$JENA_HOME"'/home/ak/Documents'
This needs to be a valid java classpath.
$JENA_HOME is directory of the Jena installation.
In the original it says:
JENA_CP="$JENA_HOME"'/lib/*'
the .../lib/* (NB single quotes - no * expansion) puts all the
jars in
that direct on the classpath.
For you:
JENA_CP='/home/ak/Downloads/apache-jena-3.8.0/lib/*'
You need to add the package/classfile tree for you code.
As you have: java:samplejena
Suppoose /DIR is the top of that directory tree so "samplejena"
is one
directory within /DIR.
You then want:
JENA_CP='/home/afs/jlib/apache-jena/lib/*:/DIR'
: is the classpath separator.
Andy
On 07/08/18 16:25, Arunkumar Krishnamoorthy wrote:
Hello,
I have attached the file with the change, i am getting Could
not find
or
load main class arq.arq
My classpath location is /home/ak/Documents. Please let me know
whether
my change is correct.
Regards,
Arun
On Tue, Aug 7, 2018 at 11:11 AM, Andy Seaborne <
[email protected]
<mailto:
[email protected]>> wrote:
Hi - Please send email to the jena users mailing list.
(It is correct if it works!)
Andy
