Yes that is the same error, but more descriptive now. There should be log output from the code on stdout - I wonder what that shows? Turning the output level down to FINE would show even more.
You can call methods on DataModel to check its state and print the result. I am pretty sure you will find it loaded nothing for some reason. The file is there, but... hmm. I am having trouble guessing how it succeeds but then has no data. Some more log output - or if you care to, some debugging - is the next step. Sean On Jun 1, 2009 4:32 PM, "Jack Tanner" <[email protected]> wrote: This still doesn't work for me off trunk. :( The new error is "dataModel has no items". When is the data model supposed to be generated? How can I check whether it has items or not? This is on Fedora 10, maven 2.1.0. HTTP ERROR: 500dataModel has no items RequestURI=/mahout-taste-webapp/RecommenderServletCaused by:java.lang.IllegalArgumentException: dataModel has no items at org.apache.mahout.cf.taste.impl.recommender.slopeone.MemoryDiffStorage.(MemoryDiffStorage.java:101) at org.apache.mahout.cf.taste.impl.recommender.slopeone.SlopeOneRecommender.(SlopeOneRecommender.ja... at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:365) at org.mortbay.jetty.security.ConstraintsSecurityHandler.handle(ConstraintsSecurityHandler.java:220) at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:181) at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:822) at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:305) at org.mortbay.jetty.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:229) at org.mortbay.jetty.handler.HandlerCollection.handle(HandlerCollection.java:113) at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152) at org.mortbay.jetty.S... at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:550) at org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:876) at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:535) at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:209) at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:407) at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:421) at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:520) Powered by Jetty:// ---------------------------------------- > Date: Fri, 29 May 2009 23:03:06 +0100 > Subject: Re: taste-web example booboo > From: [email protected] > To: [email protected]... > Oh sorry, missed that bit. Well... whatever it is, seems to be fixed. > I do know there were some ... > On Fri, May 29, 2009 at 10:41 PM, Jack Tanner wrote: >> >> Sean, >> >> I did not use the latest c... _________________________________________________________________ Windows Live™: Keep your life in sync. http://windowslive.com/explore?ocid=TXT_TAGLM_BR_life_in_synch_052009
