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https://issues.apache.org/jira/browse/MAHOUT-485?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sean Owen resolved MAHOUT-485.
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Resolution: Fixed
Try my latest change. I think it just needs to make sure that delegate is
loaded.
> NullPointerException when using GenericItemBasedRecommender with FileDataModel
> ------------------------------------------------------------------------------
>
> Key: MAHOUT-485
> URL: https://issues.apache.org/jira/browse/MAHOUT-485
> Project: Mahout
> Issue Type: Bug
> Components: Collaborative Filtering
> Affects Versions: 0.4
> Reporter: Sebastian Schelter
> Assignee: Sean Owen
> Fix For: 0.4
>
>
> When GenericItemBasedRecommender is instantiated it calls getMinPreference on
> DataModel to see if it has to build a capper. When used with a FileDataModel
> this results in a NullPointerException as FileDataModel tries to delegate
> this call to its not yet existing delegate (which is a GenericDataModel that
> is yet to be loaded)
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