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[protege-discussion] NullPointerException:null

Timothy Redmond tredmond at stanford.edu
Thu Feb 2 10:38:04 PST 2012


There is a missing null pointer check and I will try to fix this.  It is 
happening because the reasoner factory is refusing to create a 
reasoner.  The reasoner factory doesn't throw an execption it just 
returns null.  I have seen this before but not for some time.

I believe that it means that the ontology is inconsistent.  If you 
restart Protege and try a different reasoner you may get the reasoner to 
tell you this.

To me it looks like the cause of the inconsistency is that the ontology 
has some problems.  So for instance, the ontology contains a statement 
that the Family class is equivalent to the person class.  A simple 
straightforward interpretation of this claim fails.  For example I would 
guess that the Kennedy family would be an instance of the Family class.  
But that would mean that the Kennedy family is a person which I would 
not expect.

I wasn't able to replicate your situation and provide more certain 
information because I was unsure of your notation.  I was not sure if 
the "C1 Subclass C2" meant that C1 is a subclass of C2 or if you really 
mean the more traditional subClassOf.

-Timothy




On 2/2/12 7:15 AM, jayadianti herlina wrote:
> Dear Mathew
> Here is a part of my ontologies:
> *ONTOLOGY 1*
> Class:
> Family
> Subclass - HeadOfFamily (instance gitopawiro, agussusilo )
> Subclass - MemberOfFamily
> TypeOfFood
> (Instance chicken, meat, egg..etc)
> ObjectProperty :
> hasRarelyEaten
> *ONTOLOGY 2*
> Class:
> person
> Subclass - MemberOfHouseHolder (instance GitoPawiro, AgusSusilo)
> Subclass - HeadOfHouseHolder
> ConsumeFood
> (instance Chicken, Meat, Egg..etc)
> ObjectProperty :
> hasFrequentlyEatenFood
> *ONTOLOGY 3*
> Class:
> People
> Subclass - Familymember
> Subclass - HouseHolder
> DataProperty:
> hasConsumeFood
> *COMONTOLOGY*
> Class:
> people ? Family ? person ? People
> Food ? ConsumeFood ? TypeOfFood
> ObjectProperty:
> hasConsumeFood
> *DLQUERY example :*
> people and hasRarelyEaten value meat or hasFrequentlyEatenFood value 
> egg or hasConsumeFood value "egg"^^string
> *RESULT*
> Agus Susilo
> /Everything goes well, I save my ontologies and then appear the dialog 
> box nullexpresiaon:null (I attached the image)/
> /I need you help. Thank you/
> Warm regards
> Lina jayadianti
> *RDF/XML COMONTOLOGY*
> <?xml version="1.0"?>
>
> <!DOCTYPE rdf:RDF [
> <!ENTITY owl "http://www.w3.org/2002/07/owl#" >
> <!ENTITY xsd "http://www.w3.org/2001/XMLSchema#" >
> <!ENTITY rdfs "http://www.w3.org/2000/01/rdf-schema#" >
> <!ENTITY ontology3 "http://www.semanticweb.org/ontology3.owl#" >
> <!ENTITY ontology2 "http://www.semanticweb.org/ontology2.owl#" >
> <!ENTITY ontology1 "http://www.semanticweb.org/ontology1.owl#" >
> <!ENTITY rdf "http://www.w3.org/1999/02/22-rdf-syntax-ns#" >
> <!ENTITY comontology "http://www.semanticweb.org/comontology.owl#" >
> ]>
>
> <rdf:RDF xmlns="http://www.semanticweb.org/comontology.owl#"
> xml:base="http://www.semanticweb.org/comontology.owl"
> xmlns:rdfs="http://www.w3.org/2000/01/rdf-schema#"
> xmlns:comontology="http://www.semanticweb.org/comontology.owl#"
> xmlns:owl="http://www.w3.org/2002/07/owl#"
> xmlns:xsd="http://www.w3.org/2001/XMLSchema#"
> xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
> xmlns:ontology3="http://www.semanticweb.org/ontology3.owl#"
> xmlns:ontology2="http://www.semanticweb.org/ontology2.owl#"
> xmlns:ontology1="http://www.semanticweb.org/ontology1.owl#">
> <owl:Ontology rdf:about="http://www.semanticweb.org/comontology.owl">
> <owl:imports rdf:resource="http://www.semanticweb.org/ontology1.owl"/ 
> <http://www.semanticweb.org/ontology1.owl%22/>>
> <owl:imports rdf:resource="http://www.semanticweb.org/ontology2.owl"/ 
> <http://www.semanticweb.org/ontology2.owl%22/>>
> <owl:imports rdf:resource="http://www.semanticweb.org/ontology3.owl"/ 
> <http://www.semanticweb.org/ontology3.owl%22/>>
> </owl:Ontology>
>
> <!--
> ///////////////////////////////////////////////////////////////////////////////////////
> //
> // Datatypes
> //
> ///////////////////////////////////////////////////////////////////////////////////////
> -->
>
> <!--
> ///////////////////////////////////////////////////////////////////////////////////////
> //
> // Object Properties
> //
> ///////////////////////////////////////////////////////////////////////////////////////
> -->
>
> <!-- http://www.semanticweb.org/comontology.owl#hasconsumefood -->
> <owl:ObjectProperty rdf:about="&comontology;hasconsumefood">
> <owl:equivalentProperty rdf:resource="&ontology1;hasRarelyEaten"/>
> <owl:equivalentProperty rdf:resource="&ontology2;hasFrequentlyEatenFood"/>
> </owl:ObjectProperty>
>
> <!-- http://www.semanticweb.org/ontology1.owl#hasRarelyEaten -->
> <rdf:Description rdf:about="&ontology1;hasRarelyEaten"/>
>
> <!-- http://www.semanticweb.org/ontology2.owl#hasFrequentlyEatenFood -->
> <rdf:Description rdf:about="&ontology2;hasFrequentlyEatenFood"/>
>
> <!--
> ///////////////////////////////////////////////////////////////////////////////////////
> //
> // Data properties
> //
> ///////////////////////////////////////////////////////////////////////////////////////
> -->
>
> <!-- http://www.semanticweb.org/comontology.owl#name -->
> <owl:DatatypeProperty rdf:about="&comontology;name"/>
>
> <!--
> ///////////////////////////////////////////////////////////////////////////////////////
> //
> // Classes
> //
> ///////////////////////////////////////////////////////////////////////////////////////
> -->
>
> <!-- http://www.semanticweb.org/comontology.owl#Food -->
> <owl:Class rdf:about="&comontology;Food">
> <owl:equivalentClass rdf:resource="&ontology1;TypeOfFood"/>
> <owl:equivalentClass rdf:resource="&ontology2;ConsumeFood"/>
> </owl:Class>
>
> <!-- http://www.semanticweb.org/comontology.owl#HeadOfHouseHolder -->
> <owl:Class rdf:about="&comontology;HeadOfHouseHolder">
> <owl:equivalentClass rdf:resource="&ontology1;HeadOfFamily"/>
> <owl:equivalentClass rdf:resource="&ontology2;HeadOfHouseHolder"/>
> <owl:equivalentClass rdf:resource="&ontology3;FamilyMember"/>
> <rdfs:subClassOf rdf:resource="&comontology;People"/>
> </owl:Class>
>
> <!-- http://www.semanticweb.org/comontology.owl#MemberOfHouseHolder -->
> <owl:Class rdf:about="&comontology;MemberOfHouseHolder">
> <rdfs:subClassOf rdf:resource="&comontology;People"/>
> </owl:Class>
>
> <!-- http://www.semanticweb.org/comontology.owl#People -->
> <owl:Class rdf:about="&comontology;People">
> <owl:equivalentClass rdf:resource="&ontology1;Family"/>
> <owl:equivalentClass rdf:resource="&ontology2;person"/>
> <owl:equivalentClass rdf:resource="&ontology3;people"/>
> </owl:Class>
>
> <!-- http://www.semanticweb.org/ontology1.owl#Family -->
> <rdf:Description rdf:about="&ontology1;Family">
> <owl:equivalentClass rdf:resource="&ontology2;person"/>
> <owl:equivalentClass rdf:resource="&ontology3;people"/>
> </rdf:Description>
>
> <!-- http://www.semanticweb.org/ontology1.owl#HeadOfFamily -->
> <rdf:Description rdf:about="&ontology1;HeadOfFamily">
> <owl:equivalentClass rdf:resource="&ontology2;HeadOfHouseHolder"/>
> <owl:equivalentClass rdf:resource="&ontology3;FamilyMember"/>
> </rdf:Description>
>
> <!-- http://www.semanticweb.org/ontology1.owl#TypeOfFood -->
> <rdf:Description rdf:about="&ontology1;TypeOfFood">
> <owl:equivalentClass rdf:resource="&ontology2;ConsumeFood"/>
> </rdf:Description>
>
> <!-- http://www.semanticweb.org/ontology2.owl#ConsumeFood -->
> <rdf:Description rdf:about="&ontology2;ConsumeFood"/>
>
> <!-- http://www.semanticweb.org/ontology2.owl#HeadOfHouseHolder -->
> <rdf:Description rdf:about="&ontology2;HeadOfHouseHolder">
> <owl:equivalentClass rdf:resource="&ontology3;FamilyMember"/>
> </rdf:Description>
>
> <!-- http://www.semanticweb.org/ontology2.owl#person -->
> <rdf:Description rdf:about="&ontology2;person">
> <owl:equivalentClass rdf:resource="&ontology3;people"/>
> </rdf:Description>
>
> <!-- http://www.semanticweb.org/ontology3.owl#FamilyMember -->
> <rdf:Description rdf:about="&ontology3;FamilyMember"/>
>
> <!-- http://www.semanticweb.org/ontology3.owl#people -->
> <rdf:Description rdf:about="&ontology3;people"/>
>
> <!--
> ///////////////////////////////////////////////////////////////////////////////////////
> //
> // Individuals
> //
> ///////////////////////////////////////////////////////////////////////////////////////
> -->
>
> <!-- http://www.semanticweb.org/comontology.owl#AgusSusilo -->
> <owl:NamedIndividual rdf:about="&comontology;AgusSusilo">
> <rdf:type rdf:resource="&ontology3;FamilyMember"/>
> <owl:sameAs rdf:resource="&ontology1;agussusilo"/>
> <owl:sameAs rdf:resource="&ontology3;agus_susilo"/>
> </owl:NamedIndividual>
>
> <!-- http://www.semanticweb.org/comontology.owl#Gitopawiro -->
> <owl:NamedIndividual rdf:about="&comontology;Gitopawiro">
> <rdf:type rdf:resource="&ontology3;FamilyMember"/>
> <name rdf:datatype="&xsd;string">gito pawiro</name>
> <owl:sameAs rdf:resource="&ontology1;gitopawiro"/>
> <owl:sameAs rdf:resource="&ontology2;GitoPawiro"/>
> <owl:sameAs rdf:resource="&ontology3;gito_pawiro"/>
> </owl:NamedIndividual>
>
> <!-- http://www.semanticweb.org/ontology1.owl#agussusilo -->
> <rdf:Description rdf:about="&ontology1;agussusilo">
> <owl:sameAs rdf:resource="&ontology3;agus_susilo"/>
> </rdf:Description>
>
> <!-- http://www.semanticweb.org/ontology1.owl#gitopawiro -->
> <rdf:Description rdf:about="&ontology1;gitopawiro">
> <owl:sameAs rdf:resource="&ontology2;GitoPawiro"/>
> <owl:sameAs rdf:resource="&ontology3;gito_pawiro"/>
> </rdf:Description>
>
> <!-- http://www.semanticweb.org/ontology2.owl#GitoPawiro -->
> <rdf:Description rdf:about="&ontology2;GitoPawiro">
> <owl:sameAs rdf:resource="&ontology3;gito_pawiro"/>
> </rdf:Description>
>
> <!-- http://www.semanticweb.org/ontology3.owl#agus_susilo -->
> <rdf:Description rdf:about="&ontology3;agus_susilo"/>
>
> <!-- http://www.semanticweb.org/ontology3.owl#gito_pawiro -->
> <rdf:Description rdf:about="&ontology3;gito_pawiro"/>
> </rdf:RDF>
>
>
> On Wed, Feb 1, 2012 at 7:37 PM, Matthew Horridge 
> <matthew.horridge at stanford.edu <mailto:matthew.horridge at stanford.edu>> 
> wrote:
>
>     Hi Jayadianti,
>
>     Can you repeat this every time?  Would it be possible to post your
>     ontologies to the list?
>
>     Cheers,
>
>     Matthew
>
>
>     On 30 Jan 2012, at 10:05, jayadianti herlina wrote:
>
>     > Hi all,
>     > I am using Protege 4.2.0 (build 249), I am working with 3
>     ontologies and then importing them into 1 ontology.
>     > I try to map and match between 3 ontologies. Everything going well.
>     > I am using DL Query (Version 1.1.0) and select a reasoner
>     (hermit 1.3.5 and faCT++).
>     > All as I expected, the query done very well, and mapped out
>     perfectly :)
>     >
>     > Then I save the file as usual, and then I tried to open it again.
>     > I do a query with DLquery as usual and appeared dialog box:
>     NullPointerException: null - whereas before all goes well.
>     > is this a known bug?
>     > Thank you very much for your help
>     >
>     > Warm Regards
>     > Jayadianti
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