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From Helder Martins <>
Subject Re: Issue when running Mahout Recommender Demo
Date Wed, 24 Jul 2013 13:45:17 GMT
I was suffering with this problem too, but I solved it by adding the Jetty dependency into
Mahout examples by doing the following steps:

1. Copy the Jetty dependency into mahout examples pom.xml

2. Copy integration's webapp folder into mahout examples
$ mkdir -p mahout/examples/src/main/webapp/WEB-INF
$ cp mahout/integration/src/main/webapp/WEB-INF/web.xml mahout/examples/src/main/webapp/WEB-INF/web.xml

3. Run Jetty inside the example submodule
$ cd mahout/examples
$ mvn:jetty

4. Access it in a browser by using the following URL:

I suspect that this problem is happening because forgot to move the webapp folder to the examples
dir and add the Jetty dependency when the GroupLens example moved to the examples submodule.
A JIRA ticket could be opened to address that.

On 07/24/2013 12:23 AM, Jason Lee wrote:

@*Sean* & @Manuel, Thanks for your replies.

I solved this problem by adding a lower version of mahout-examples to
dependencies of mahout-integration, since maven is identify a unique
project by its groupId, artifactId and version, so we can avoid Maven
Circular Dependency by specify a different version of A to dependency of B
since B is dependency of A.

For example, Now i am run mahout 0.9-SNAPSHOT, there already has a
dependency in *mahout-examples/pom.xml* like this:


The version of this dependency is  0.9-SNAPSHOT implicitly. So, if i just
add below code into *mahout-integration/pom.xml*:


The Maven Circular Dependency problem will arise. But if we specify a
different version of mahout-examples as mahout-integration's
dependency(lower that 0.9, for example, 0.8), that will be fine:


- Jason

On Fri, Jul 19, 2013 at 11:13 PM, Manuel Blechschmidt <<>> wrote:

Hi Jason,
if it is just about to get something up and running as fast as possible I
would recommend my github project:

It uses a glassfish 3.1.2 server but it is bundled. So you should get it
running with the following 3 commands:

git clone git://
cd facebook-recommender-demo
mvn install
mvn embedded-glassfish:run


Am 19.07.2013 um 15:56 schrieb Sean Owen:

I think this is just old, and now you need to run from examples/. I
admit I don't know if this Jetty-based demo is still working or in the
project though. If so it should just be deleted.

On Fri, Jul 19, 2013 at 4:21 AM, Jason Lee <><>

Hi, guys,

I was trying to following the doc

When I run jetty:run under *mahout-integration*, I am getting a

I noticed that GroupLensRecommender is belong to *mahout-examples*, so
i attempt add mahout-examples to dependencies of mahout-integration;
But, unfortunately, there already has a reversed dependency between
mahout-examples & mahout-integration, and Circular Dependency is not
allowed in maven, so i failed.

Btw, i am running mahout 0.8.

Manuel Blechschmidt
M.Sc. IT Systems Engineering
Dortustr. 57
14467 Potsdam
Mobil: 0173/6322621


Helder Martins
Arquitetura do Portal e Sistemas de Backend
+55 (51) 3284-4475

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