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.
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