The error is still shown up when I run mvn jetty:run on the
mahout-integration project using src distribution:
[INFO] Starting jetty 6.1.10 ...
2012-01-24 13:31:03.709::INFO: jetty-6.1.10
2012-01-24 13:31:04.842::INFO: No Transaction manager found - if your
webapp requires one, please configure one.
2012-01-24 13:31:05.233::WARN: failed taste-recommender
javax.servlet.
ServletException: java.lang.IllegalStateException:
java.lang.ClassNotFoundException:
org.apache.mahout.cf.taste.example.grouplens.GroupLensRecommender
at
org.mortbay.jetty.servlet.ServletHolder.initServlet(ServletHolder.java:437)
at
org.mortbay.jetty.servlet.ServletHolder.doStart(ServletHolder.java:256)
at
org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:39)
at
org.mortbay.jetty.servlet.ServletHandler.initialize(ServletHandler.java:612)
at org.mortbay.jetty.servlet.Context.startContext(Context.java:139)
at
org.mortbay.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1220)
at
org.mortbay.jetty.handler.ContextHandler.doStart(ContextHandler.java:510)
at
org.mortbay.jetty.webapp.WebAppContext.doStart(WebAppContext.java:448)
at
org.mortbay.jetty.plugin.Jetty6PluginWebAppContext.doStart(Jetty6PluginWebAppContext.java:110)
at
org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:39)
at
org.mortbay.jetty.handler.HandlerCollection.doStart(HandlerCollection.java:152)
at
org.mortbay.jetty.handler.ContextHandlerCollection.doStart(ContextHandlerCollection.java:156)
at
org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:39)
at
org.mortbay.jetty.handler.HandlerCollection.doStart(HandlerCollection.java:152)
at
org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:39)
at
org.mortbay.jetty.handler.HandlerWrapper.doStart(HandlerWrapper.java:130)
at org.mortbay.jetty.Server.doStart(Server.java:222)
On Tue, Apr 10, 2012 at 11:10 AM, Sean Owen <[email protected]> wrote:
> I am still not sure what the problem is. It is entirely fine to load
> classes which depend upon one another.
>
> What's the specific error? These instructions remain correct.
> On Apr 10, 2012 11:19 AM, "Way Cool" <[email protected]> wrote:
>
> > It's not a circular dependency at compile time, however it happens at run
> > time. mahout-examples has dependency on mahout-integration, and when we
> run
> > mahout-integration project using "mvn jetty:run", it complains about a
> > missing class which is defined in mahout-examples.
> > Here is the instructions how to run the demo (
> > https://cwiki.apache.org/MAHOUT/recommender-documentation.html):
> > Demo
> >
> > To build and run the demo, follow the instructions below, which are
> written
> > for Unix-like operating systems:
> >
> > - Obtain a copy of the Mahout distribution, either from SVN or as a
> > downloaded archive.
> > - Download the "1 Million MovieLens Dataset" from
> > Grouplens.org<http://www.grouplens.org/>
> > - Unpack the archive and copy movies.dat and ratings.dat to
> >
> >
> trunk/integration/src/main/resources/org/apache/mahout/cf/taste/example/grouplens
> > under the Mahout distribution directory.
> > - Navigate to the directory where you unpacked the Mahout distribution,
> > and navigate to trunk.
> > - Run mvn -DskipTests install, which builds and installs Mahout core to
> > your local repository
> > - cd integration
> > - You may need to give Maven more memory: in a bash shell, export
> > MAVEN_OPTS=-Xmx1024M
> > - mvn jetty:run.
> > - Get recommendations by accessing the web application in your browser:
> >
> http://localhost:8080/mahout-integration/RecommenderServlet?userID=1This
> > will produce a simple preference-item ID list which could be consumed
> > by a client application. Get more useful human-readable output with the
> > debug parameter:
> >
> >
> http://localhost:8080/mahout-integration/RecommenderServlet?userID=1&debug=true
> >
> >
> > Sean, do you have any link which specifies correct steps to run
> > recommendation demo?
> >
> > Thanks,
> >
> > Yugang
> >
> > On Tue, Jan 24, 2012 at 2:31 PM, Sean Owen <[email protected]> wrote:
> >
> > > Backing up a sec -- I looked, and there is not a circular dependency
> here
> > > to begin with. integration does not depend on examples.
> > >
> > > This is not a Maven build issue, or else the error would be from the
> > Maven
> > > build. You are building the example .war file and need to put your
> > > implementation .jar in a particular place such that it's built into the
> > > .war. In your case that's the examples .jar. I am guessing it was not
> > > actually included. This part is not something Maven does for you.
> > >
> > > On Tue, Jan 24, 2012 at 8:51 PM, Way Cool <[email protected]>
> > wrote:
> > >
> > > > Sure, because we want maven to handle dependency for us. What's your
> > fix?
> > > > Just add a dependency to pom,xml in integration project? If you do
> > that,
> > > > which project do you want to build first? Thanks for your reply Sean.
> > > >
> > > > On Tue, Jan 24, 2012 at 1:43 PM, Sean Owen <[email protected]> wrote:
> > > >
> > > > > Why is that a problem? you just need both. It works fine, just as
> any
> > > > other
> > > > > such dependency in Java works.
> > > > >
> > > > > On Tue, Jan 24, 2012 at 8:39 PM, Way Cool <[email protected]>
> > > > wrote:
> > > > > >
> > > > > > That's mainly because the class GroupLensRecommender is defined
> in
> > > > > examples
> > > > > > project, which depends on integration project, and integration
> > > project
> > > > is
> > > > > > trying to load the class...
> > > > > >
> > > > > > Have you guys seen the issue as well?
> > > > > >
> > > > > > Thanks,
> > > > > >
> > > > > > YG
> > > > > >
> > > > >
> > > >
> > >
> >
>
