What's the command that you sent in that gave this result? Also, are
there any logs?
On May 27, 2009, at 5:54 PM, Jack Tanner wrote:
I'm trying to run the taste-web example using mahout 0.1 and the
grouplens dataset. All the steps here went fine:
http://lucene.apache.org/mahout/taste.html#demo
But now I get:
Problem accessing /mahout-taste-webapp/RecommenderServlet. Reason:
size must be at least 1
Caused by:java.lang.IllegalArgumentException: size must be at least 1
at org.apache.mahout.cf.taste.impl.common.FastSet.(FastSet.java:68)
at
org
.apache.mahout.cf.taste.impl.recommender.slopeone.MemoryDiffStorage.
(MemoryDiffStorage.java:110)
at
org
.apache
.mahout.cf.taste.impl.recommender.slopeone.SlopeOneRecommender.
(SlopeOneRecommender.java:65)
at
org.apache.mahout.cf.taste.example.grouplens.GroupLensRecommender.
(GroupLensRecommender.java:57)
at
org.apache.mahout.cf.taste.example.grouplens.GroupLensRecommender.
(GroupLensRecommender.java:46)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native
Method)
at
sun
.reflect
.NativeConstructorAccessorImpl
.newInstance(NativeConstructorAccessorImpl.java:57)
at
sun
.reflect
.DelegatingConstructorAccessorImpl
.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:532)
at java.lang.Class.newInstance0(Class.java:372)
at java.lang.Class.newInstance(Class.java:325)
at org.apache.mahout.cf.taste.web.RecommenderSingleton.
(RecommenderSingleton.java:51)
at org.apache.mahout.cf.taste.web.RecommenderSingleton.initializeIfNeeded
(RecommenderSingleton.java:42)
at
org
.apache
.mahout.cf.taste.web.RecommenderServlet.init(RecommenderServlet.java:
76)
at
org
.mortbay.jetty.servlet.ServletHolder.initServlet(ServletHolder.java:
431)
at
org
.mortbay.jetty.servlet.ServletHolder.getServlet(ServletHolder.java:
339)
at
org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:478)
at
org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:
389)
at
org
.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:
216)
at
org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:
181)
at
org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:
765)
at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:
417)
at
org
.mortbay
.jetty
.handler
.ContextHandlerCollection.handle(ContextHandlerCollection.java:230)
at
org
.mortbay
.jetty.handler.HandlerCollection.handle(HandlerCollection.java:114)
at
org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:
152)
at org.mortbay.jetty.Server.handle(Server.java:324)
at
org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:
535)
at org.mortbay.jetty.HttpConnection
$RequestHandler.headerComplete(HttpConnection.java:865)
at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:539)
at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:212)
at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
at
org
.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:
409)
at org.mortbay.thread.QueuedThreadPool
$PoolThread.run(QueuedThreadPool.java:520)
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--------------------------
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http://www.lucidimagination.com/
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