This is a different issue. I see it and will put in a fix today.
On Fri, Sep 24, 2010 at 9:07 PM, Stanley Ipkiss <[email protected]> wrote: > > I did that change yesterday in my code, but forgot to post the update here. > The error that I get sometimes is - > > Caused by: java.lang.NullPointerException > at > org.apache.mahout.cf.taste.impl.similarity.file.FileItemSimilarity.itemSimilarities(FileItemSimilarity.java:108) > at > org.apache.mahout.cf.taste.impl.recommender.GenericItemBasedRecommender.doEstimatePreference(GenericItemBasedRecommender.java:195) > at > org.apache.mahout.cf.taste.impl.recommender.GenericItemBasedRecommender.estimatePreference(GenericItemBasedRecommender.java:126) > at > org.apache.mahout.cf.taste.impl.recommender.CachingRecommender$EstimatedPrefRetriever.get(CachingRecommender.java:214) > at > org.apache.mahout.cf.taste.impl.recommender.CachingRecommender$EstimatedPrefRetriever.get(CachingRecommender.java:1) > at > org.apache.mahout.cf.taste.impl.common.Cache.getAndCacheValue(Cache.java:127) > at org.apache.mahout.cf.taste.impl.common.Cache.get(Cache.java:96) > at > org.apache.mahout.cf.taste.impl.recommender.CachingRecommender.estimatePreference(CachingRecommender.java:128) > > I am still looking into for what particular case, does the > FileItemSimilarity go crazy. > -- > View this message in context: > http://lucene.472066.n3.nabble.com/Possible-multi-thread-issue-in-AbstractDifferenceRecommenderEvaluator-tp1571411p1576371.html > Sent from the Mahout User List mailing list archive at Nabble.com. >
