Re: [jgrapht-users] No such vertex in Graph error

[Pallavi K. <kar...@gm...>]

Thanks much,
Will try these debugging steps..



On Jan 8, 2018 6:31 PM, "Dimitrios Michail" <dim...@gm...>
wrote:

> Almost always this is a problem with hashCode() and Equals() as Joris
> suggested.
>
> Some directions for debugging:
>  - Make sure that your hashCode() and equals() are consistent.
>  - The graph creates edges using an EdgeFactory class. If you do not
> provide one by the constructor, it uses a
>    ClassBasedEdgeFactory which calls the edge default constructor. If your
> edge default constructor does not create unique objects
>    then you might experience such problems.
>  - The wiki article https://github.com/jgrapht/
> jgrapht/wiki/EqualsAndHashCode explains the most common problems, and
>    also describes how to use the class ParanoidGraph for debugging.
>  - Try to replace your vertices and edges with Graph<Integer, DefaultEdge>
> and see if it works. There are plenty of examples in
>    the test cases of the library.
>
>
> On Mon, Jan 8, 2018 at 12:35 PM, Pallavi Karanth <kar...@gm...
> > wrote:
>
>> Changed vertex type to a class which implements equals and hashcode,
>> Still getting the same error,
>> May I know how to resolve this?
>> Thanks much..
>>
>> On Mon, Jan 8, 2018 at 2:21 PM, J Kinable <j.k...@gm...> wrote:
>>
>>> Most likely, this is the issue:
>>> https://github.com/jgrapht/jgrapht/wiki/EqualsAndHashCode
>>>
>>>
>>> On Mon, Jan 8, 2018 at 1:21 AM, Pallavi Karanth <
>>> kar...@gm...> wrote:
>>>
>>>> Hi,
>>>>
>>>> Have formed a DefaultDirectedGraph like this:
>>>> public DirectedGraph<OWLEntity, DefaultEdge> OWLGraph = new
>>>> DefaultDirectedGraph<OWLEntity, DefaultEdge>(DefaultEdge.class);
>>>>
>>>> Have added vertices and edges,
>>>> Vertex list is printed as follows:
>>>> System.out.println(OWLGraph.vertexSet());
>>>>
>>>> The list shows the vertex:
>>>> http://www.semanticweb.org/drkm/ontologies/2017/4/untitled-o
>>>> ntology-82#Disease
>>>>
>>>> Am constructing all directed paths from the graph as follows:
>>>> AllDirectedPaths allPathsGraph = new AllDirectedPaths(toGraph.OWLGr
>>>> aph);
>>>>
>>>> Here, OWLGraph is the default directed graph,
>>>>
>>>> Next, i call getAllPaths from source vertex http://www.semanticweb.
>>>> org/drkm/ontologies/2017/4/untitled-ontology-82#Food to destination
>>>> vertex:
>>>> http://www.semanticweb.org/drkm/ontologies/2017/4/untitled-o
>>>> ntology-82#Disease
>>>>
>>>> The stack trace shows the error as:
>>>> java.lang.IllegalArgumentException: no such vertex in graph:
>>>> http://www.semanticweb.org/drkm/ontologies/2017/4/unti
>>>> tled-ontology-82#Disease
>>>> at org.jgrapht.graph.AbstractGraph.assertVertexExist(AbstractGr
>>>> aph.java:132)
>>>> at org.jgrapht.graph.AbstractBaseGraph.incomingEdgesOf(Abstract
>>>> BaseGraph.java:365)
>>>> at org.jgrapht.alg.AllDirectedPaths.edgeMinDistancesBackwards(A
>>>> llDirectedPaths.java:158)
>>>> at org.jgrapht.alg.AllDirectedPaths.getAllPaths(AllDirectedPath
>>>> s.java:105)
>>>> at org.jgrapht.alg.AllDirectedPaths.getAllPaths(AllDirectedPath
>>>> s.java:69)
>>>> at com.mycompany.semanticdistance.SemanticDistance.SemanticDist
>>>> ance(SemanticDistance.java:161)
>>>> at com.mycompany.semanticdistance.SemanticDistance.loadOntology
>>>> (SemanticDistance.java:136)
>>>> at com.mycompany.semanticdistance.SemanticDistance.main(Semanti
>>>> cDistance.java:84)
>>>>
>>>> May i know how to resolve this?
>>>> Kindly help.
>>>> Thanks much in advance
>>>>
>>>> --
>>>> Regs, Pallavi
>>>>
>>>> Linkedin Profile : http://in.linkedin.com/pub/pallavi-karanth/b/b71/26b
>>>>
>>>> “Your time is limited, don’t waste it living someone else’s life. Don’t
>>>> be trapped by dogma, which is living the result of other people’s thinking.
>>>> Don’t let the noise of other opinions drown your own inner voice. And most
>>>> important, have the courage to follow your heart and intuition, they
>>>> somehow already know what you truly want to become. Everything else is
>>>> secondary.”
>>>>
>>>> -- Steve Jobs
>>>>
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>>>> ------------------
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>>>>
>>>>
>>>
>>
>>
>> --
>> Regs, Pallavi
>>
>> Linkedin Profile : http://in.linkedin.com/pub/pallavi-karanth/b/b71/26b
>>
>> “Your time is limited, don’t waste it living someone else’s life. Don’t
>> be trapped by dogma, which is living the result of other people’s thinking.
>> Don’t let the noise of other opinions drown your own inner voice. And most
>> important, have the courage to follow your heart and intuition, they
>> somehow already know what you truly want to become. Everything else is
>> secondary.”
>>
>> -- Steve Jobs
>>
>> ------------------------------------------------------------
>> ------------------
>> Check out the vibrant tech community on one of the world's most
>> engaging tech sites, Slashdot.org! http://sdm.link/slashdot
>> _______________________________________________
>> jgrapht-users mailing list
>> jgr...@li...
>> https://lists.sourceforge.net/lists/listinfo/jgrapht-users
>>
>>
>
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