getCommonParentIndex causing an exception

  • Pat Halogen

    Pat Halogen - 2004-02-19


    I am looping through various senses for certain words trying to find the nearest common parent for each sense pair. I am using the examples code line:

    System.out.println("Common Parent Index: " + ((AsymmetricRelationship) list.get(0)).getCommonParentIndex());

    to get it printed. However, with certain sense-pairs I get an exeption ending in:

    java.lang.IndexOutOfBoundsException: Index: 0, Size: 0
            at java.util.ArrayList.RangeCheck(
            at java.util.ArrayList.get(
            at net.didion.jwnl.util.TypeCheckingList.get(

    I noticed that the word sense-pairs that cause that exception do not have a common parent in the WordNet dictionary. For example if you try to get a common parent for the sense of animal, "dog", (the top-node of which is 'entity') with the 'seal' in the sense 'stamp affixed to a document' (the topnode of which is 'abstraction') the above error message is displayed.

    To me it seems that this is a bug in JWNL, but I guess that there is a way of avoiding the above by using some other of the JWNL methods. My question is: How could I elicit the information through JWNL-API that the two senses have no common parents without getting to this error?

    Thanks, ps

    • Pat Halogen

      Pat Halogen - 2004-02-23


      I managed to ignore the nodes with no common parents by putting my code within an iterator-loop that checks whether there is any content in the list. However, I feel, JWNL being an API this checking should probably be done in the JWNL code itself. The user should not worry about the structure and failings of the WordNet itself.



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