[Pellet-users] OutOfMemoryException in RulesExample

[Noah Zimmerman]

Hello,

 

I am working on a Pellet implementation of the Protégé SWRLRuleEngineBridge
[1]. I tried loading the sample ontology family.swrl.owl [2] included in the
Protégé distribution as illustrated in the RulesExample file in Pellet. 

 

                ont = "http://www.stanford.edu/~noahz/family.swrl.owl";

                model =
ModelFactory.createOntologyModel(PelletReasonerFactory.

                        THE_SPEC, null);  

                model.read(ont);

 

After approximately 15 sec of churning I get an OutOfMemoryException. 

 

INFO [AWT-EventQueue-0] (PelletOptions.java:82) - Reading Pellet
configuration file
jar:file:/C:/Protege/Pellet/dist/lib/pellet.jar!/pellet.properties

 INFO [AWT-EventQueue-0] (KnowledgeBase.java:1470) - Expressivity:
ALCHOIF(D), Classes: 31 Properties: 30 Individuals: 100 Strategy:
RuleStrategy

 INFO [AWT-EventQueue-0] (ABox.java:1527) - ABox consistency for 0
individuals

Exception in thread "AWT-EventQueue-0" java.lang.OutOfMemoryError: Java heap
space 

 

I have my heap size increased (java -Xmx1024m). Working with the latest
version of Pellet checked out today (revision 322) and the latest version of
Protégé OWL (3.3). Windows XP, 2G RAM, java 1.5 

 

I get the same result when I run the RulesExample with the family ontology
(outside of Protégé):

 

RulesExample, JVM 1.5.0_03-b07, memory=1065M

 INFO [main] (PelletOptions.java:82) - Reading Pellet configuration file
jar:file:/C:/Protege/Pellet/dist/lib/pellet.jar!/pellet.properties

 INFO [main] (KnowledgeBase.java:1470) - Expressivity: ALCHOIF(D), Classes:
31 Properties: 30 Individuals: 100 Strategy: RuleStrategy

 INFO [main] (ABox.java:1527) - ABox consistency for 0 individuals

Exception in thread "main" java.lang.OutOfMemoryError: Java heap space

 

Have others gotten the family example to work successfully using Pellet? Any
ideas why it is causing such problems? 

 

Thank you,

Noah

 

[1] http://protege.cim3.net/cgi-bin/wiki.pl?SWRLRuleEngineBridgeFAQ

Reproduced at [2] http://www.stanford.edu/~noahz/family.swrl.owl

 

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