[Pellet-users] Out of memory when using rules

[Somaya Aboulwafa]

I forgot to say that i have tried this using both Jena and OWLAPI. When
using OWLAPI I got the following exception:

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

at java.util.Arrays.copyOf(Unknown Source)

at java.util.BitSet.ensureCapacity(Unknown Source)

at java.util.BitSet.expandTo(Unknown Source)

at java.util.BitSet.set(Unknown Source)

at org.mindswap.pellet.DependencySet.<init>(*DependencySet.java:97*)

at org.mindswap.pellet.RuleBranch.tryBranch(*RuleBranch.java:149*)

at org.mindswap.pellet.RuleStrategy.createDisjunctionsFromBinding(*
RuleStrategy.java:413*)

at org.mindswap.pellet.RuleStrategy.applyRULERule(*RuleStrategy.java:148*)

at org.mindswap.pellet.RuleStrategy.complete(*RuleStrategy.java:319*)

at org.mindswap.pellet.ABox.isConsistent(*ABox.java:1605*)

at org.mindswap.pellet.ABox.isConsistent(*ABox.java:1489*)

at org.mindswap.pellet.KnowledgeBase.consistency(*KnowledgeBase.java:1568*)

at org.mindswap.pellet.KnowledgeBase.isConsistent(*KnowledgeBase.java:1589*)

at org.mindswap.pellet.KnowledgeBase.ensureConsistency(*
KnowledgeBase.java:1595*)

at org.mindswap.pellet.KnowledgeBase.classify(*KnowledgeBase.java:1601*)

at org.mindswap.pellet.KnowledgeBase.realize(*KnowledgeBase.java:1630*)

at org.mindswap.pellet.KnowledgeBase.getInstances(*KnowledgeBase.java:2710*)

at org.mindswap.pellet.owlapi.Reasoner.getIndividuals(*Reasoner.java:550*)

at Trial1.PolicyReasoningOWLapi.main(*PolicyReasoningOWLapi.java:44*)

And When using Jena I got the following similar exception:

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

at java.util.Arrays.copyOf(Unknown Source)

at java.util.BitSet.ensureCapacity(Unknown Source)

at java.util.BitSet.expandTo(Unknown Source)

at java.util.BitSet.set(Unknown Source)

at org.mindswap.pellet.DependencySet.<init>(*DependencySet.java:97*)

at org.mindswap.pellet.RuleBranch.tryBranch(*RuleBranch.java:149*)

at org.mindswap.pellet.RuleStrategy.createDisjunctionsFromBinding(*
RuleStrategy.java:413*)

at org.mindswap.pellet.RuleStrategy.applyRULERule(*RuleStrategy.java:148*)

at org.mindswap.pellet.RuleStrategy.complete(*RuleStrategy.java:319*)

at org.mindswap.pellet.ABox.isConsistent(*ABox.java:1605*)

at org.mindswap.pellet.ABox.isConsistent(*ABox.java:1489*)

at org.mindswap.pellet.KnowledgeBase.consistency(*KnowledgeBase.java:1568*)

at org.mindswap.pellet.KnowledgeBase.isConsistent(*KnowledgeBase.java:1589*)

at org.mindswap.pellet.jena.PelletInfGraph.prepare(*PelletInfGraph.java:267*
)

at com.hp.hpl.jena.ontology.impl.OntModelImpl.prepare(*
OntModelImpl.java:2598*)

at Trial1.PolicyReasoningJena.main(*PolicyReasoningJena.java:38*)
Thanks in advance,
Somaya

On Sun, Apr 6, 2008 at 3:09 PM, Somaya Aboulwafa <somaya.ahmad at gmail.com>
wrote:

> *Hi all,*
> *I'm in need for help on how to troubleshoot this problem. I got an out of
> memory exception (heap space). I use an ontology generated by **Protege
> (with OWL Plugin 3.3.1, Build 430) and I use Pellet 1.5.1 APIs. My ontology
> has some classes and individuals and only one rule. The rule is as follows:
> *
>
> *Agent(?x), IsInactivestaff(?C), hasCred(?X,?C), CoursesProh(?P) ->
> hasAD(?X,?P)*
>
> *However, when I write the rules as follows, then I got no exception and
> the inference works fine:*
>
> *Agent(?x), IsInactivestaff(?C), hasCred(?X,?C) -> hasAD(?X,Proh_Teach)*
>
> *Where: Proh_Teach is an individual of class CoursesProh*
> *I have removed all the enumerated classes. As I read in some previous
> posts that it might make a problem with pellet. Also I don't use min/max
> cardinalities. Moreover I have increased the JVM allocated memory to 500M,
> but it doesn't work.*
>
> *I don't know where the problem? Do I need to re-design my ontology differently? Or there is something wrong with the first rule?*
>
> * **Plz let me know if I should send my OWL files.*
>
> * *
>
> *Regards,*
>
> *Somaya*
>
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.owldl.com/pipermail/pellet-users/attachments/20080406/5575b42d/attachment.htm