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From Jack Tanner <>
Subject RE: taste-web example booboo
Date Mon, 01 Jun 2009 15:31:29 GMT

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 sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance(
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(
	at java.lang.reflect.Constructor.newInstance(
	at java.lang.Class.newInstance0(
	at java.lang.Class.newInstance(
	at org.mortbay.jetty.servlet.ServletHolder.initServlet(
	at org.mortbay.jetty.servlet.ServletHolder.getServlet(
	at org.mortbay.jetty.servlet.ServletHolder.handle(
	at org.mortbay.jetty.servlet.ServletHandler.handle(
	at org.mortbay.jetty.servlet.SessionHandler.handle(
	at org.mortbay.jetty.handler.ContextHandler.handle(
	at org.mortbay.jetty.webapp.WebAppContext.handle(
	at org.mortbay.jetty.handler.ContextHandlerCollection.handle(
	at org.mortbay.jetty.handler.HandlerCollection.handle(
	at org.mortbay.jetty.handler.HandlerWrapper.handle(
	at org.mortbay.jetty.Server.handle(
	at org.mortbay.jetty.HttpConnection.handleRequest(
	at org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(
	at org.mortbay.jetty.HttpParser.parseNext(
	at org.mortbay.jetty.HttpParser.parseAvailable(
	at org.mortbay.jetty.HttpConnection.handle(
	at org.mortbay.thread.QueuedThreadPool$

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> Date: Fri, 29 May 2009 23:03:06 +0100
> Subject: Re: taste-web example booboo
> From:
> To:
> Oh sorry, missed that bit. Well... whatever it is, seems to be fixed.
> I do know there were some changes to the file reading bits in recent
> memory, perhaps after 0.1, so at this point the most likely conclusion
> is that this is fixed as of the code in Subversion right now at least.
> On Fri, May 29, 2009 at 10:41 PM, Jack Tanner  wrote:
>> Sean,
>> I did not use the latest code. As I said in my message, I used mahout 0.1.
>> Should I try with the latest, or do you want to try with 0.1?

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