[protege-discussion] problems classifying OWL-DL ontology containing import command

[Alexandre Vidal]

Hi. Could someone help me?

I'm testing the classification task on two OWL-DL ontologies:
(1) http://www.deinf.ufma.br/~vidal/GBOS/PlatformOntology.owl
(2) http://www.deinf.ufma.br/~vidal/GBOS/GridBaseOntology.owl

I submitted both ontologies to validator, and they are Ok.

The ontology (1) does not import any ontology, while the ontology (2) does.

I'm using Eclipse and Protégé-OWL API with this simple code:

try {
	JenaOWLModel gridOwlModel =
ProtegeOWL.createJenaOWLModelFromURI(ONTOLOGY_URL);

       ReasonerManager reasonerManager = ReasonerManager.getInstance();

       ProtegeOWLReasoner reasoner = reasonerManager.getReasoner(gridOwlModel);
			
	//	Set the reasoner URL and test the connection.
	reasoner.setURL(REASONER_URL);
			
	if (reasoner.isConnected()) {
	    DIGReasonerIdentity reasonerIdentity = reasoner.getIdentity();
	    System.out.println("Connected to " + reasonerIdentity.getName() + " " +
			    		reasonerIdentity.getVersion());

	    //	We can classify the whole ontology, which will put the
	    //	inferred class hierarchy information directly into the
Protégé-OWL model.
	    System.out.println("Classifying taxonomy...");
	    reasoner.classifyTaxonomy(null);
	    System.out.println("...Classified taxonomy!");
	else {
                System.out.println("Reasoner not connected!");
         }
} catch (Exception e) {
	// TODO Auto-generated catch block
	e.printStackTrace();
}


I have no problem to classify the former ontology;
However, when I try to classify the later, I get the error messages
below, though I've been succeed before classifying this same ontology.
What could cause such errors?
----------------------------------------------------------------------------------------------
vidal at vidal-laptop:/home/pos/aplicativos/pellet-1.4-RC1$  sh pellet-dig.sh

PelletDIGServer Version 1.4-RC1 (November 7 2006)
Port: 8081
 WARN [HttpConnection] - POST / HTTP/1.1
java.lang.OutOfMemoryError: Java heap space     // error on Pellet execution
---------------------------------------------------------------------------------------------
Eclipse error Message:
JVM terminated. Exit code=1
/usr/bin/java
-Xms40m
-Xmx256m
-jar /home/pub/eclipse3.2//startup.jar
-os linux
-ws gtk
-arch x86
-launcher /home/pub/eclipse3.2//eclipse
-name Eclipse
-showsplash 600
-exitdata 46000a
-data /home/vidal/Workspace
-vm /usr/bin/java
-vmargs
-Xms40m
-Xmx256m
-jar /home/pub/eclipse3.2//startup.jar

Thanks.

Alexandre