The only way to solve this cleanly would be to package your plugn using a tool like jarjar which embeds jar from modules inside a global jar. Groovy is packaged like that and it has solved conflicts on the asm jar with hibernate. It could make sense to upgrade Xerces in XWiki. Ludovic Julien Bourdon a écrit :

I resolved this tricky problem. Jena and XWiki both use Xerces. I found the actualValueType field in the xerces API (http://xerces.apache.org/xerces2-j/javadocs/xerces2/org/apache/xerces/impl/d... <http://xerces.apache.org/xerces2-j/javadocs/xerces2/org/apache/xerces/impl/dv/ValidatedInfo.html#actualValue>). . The fact is that it seems that XWiki uses a jar file which is less complete than the one provided by Jena (called xercesImpl.jar). I therefore deleted <http://svn.forge.objectweb.org/cgi-bin/viewcvs.cgi/xwiki/xwiki/trunk/lib/xerces-2.4.0.jar?view=log&rev=468>xerces-2.4.0.jar from WEB-INF/lib and replaced it with the one provided by xerces.

However, this looks more like a hack to a real solution. Does anyone know where I could configure XWiki to give priority to the Jena jar when I call my plugin rather than to the XWiki one?

Thanks a lot!

On 05/04/06, *Julien Bourdon* <[email protected] <mailto:[email protected]>> wrote:

Hi all!

I'm trying to develop a plugin to interact with Jena (http://jena.sourceforge.net <http://jena.sourceforge.net>), a semantic web framework.

I developed the plugin as I documented it in the plugin development tutorial. I have a hello() method which works perfectly. however when I try to call this method:

public List<String> test1(){ Vector<String> uris = new Vector<String>(); OntModel model = ModelFactory.createOntologyModel(OntModelSpec.RDFS_MEM_RDFS_INF, null );

model.read("http://www.dcs.shef.ac.uk/~zzc05jb/environmentOntology/pollutionInventory.rd... <http://www.dcs.shef.ac.uk/%7Ezzc05jb/environmentOntology/pollutionInventory.rdfs>"); model.read(" http://www.dcs.shef.ac.uk/~zzc05jb/environmentOntology/instances/disposalRec... <http://www.dcs.shef.ac.uk/%7Ezzc05jb/environmentOntology/instances/disposalRecoveryMethods.rdf>"); Iterator iter = model.listIndividuals(); while(iter.hasNext()){ OntResource ontClass = (OntResource)iter.next(); uris.add(ontClass.getURI()); } return uris; }

I get this exception:

Error number 4001 in 4: Error while parsing velocity page Tests.OntologyPlugin Wrapped Exception: Invocation of method 'test1' in class secoia.plugin.OntologyPluginApi threw exception class java.lang.NoSuchFieldError : actualValueType

I can't really make sense of it. This method works if i use it form a classic Java application. I copied all the Jena jar files to the webapps/xwiki/WEB-INF/lib directory. Moreover, I don't know where this actualValueType comes from. Does it come from XWiki?

Any clue on this problem?

Thanks a lot!

-- _ _ Julien Bourdon (o)(o)--. http://purl.org/net/JulienBourdon \../ ( ) self isAddictedTo:(#Squeak&#linux) m\/m--m'`--. ^true

-- _ _ Julien Bourdon (o)(o)--. http://purl.org/net/JulienBourdon \../ ( ) self isAddictedTo:(#Squeak&#linux) m\/m--m'`--. ^true ------------------------------------------------------------------------

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