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From "Sean Owen (JIRA)" <j...@apache.org>
Subject [jira] Resolved: (MAHOUT-615) unable to instanciate FastByIDMap<PreferenceArray>, ClassNotFoundException for com.google.common.base.Preconditions
Date Tue, 01 Mar 2011 12:04:37 GMT

     [ https://issues.apache.org/jira/browse/MAHOUT-615?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Sean Owen resolved MAHOUT-615.
------------------------------

    Resolution: Not A Problem
      Assignee: Sean Owen  (was: Benson Margulies)

Well, this means you need Google Guava in your project one way or the other. I don't know
if GWT has it, but may do, in which case there should be no issue. If not, you need to get
the library into your project. This is not really to do with Mahout.

> unable to instanciate FastByIDMap<PreferenceArray>, ClassNotFoundException for
com.google.common.base.Preconditions
> -------------------------------------------------------------------------------------------------------------------
>
>                 Key: MAHOUT-615
>                 URL: https://issues.apache.org/jira/browse/MAHOUT-615
>             Project: Mahout
>          Issue Type: Bug
>          Components: collections
>    Affects Versions: 0.4
>         Environment: Windows 7, Java 1.6.0.24, reproducable in eclipse helios and netbeans
6.9
>            Reporter: bernd hopp
>            Assignee: Sean Owen
>
> this code:
>  FastByIDMap<PreferenceArray> map = new FastByIDMap<PreferenceArray>(); 
 
> throws an java.lang.ClassNotFoundException, class com.google.common.base.Preconditions
cannot be found.
> The error is thrown in FastByIdMap, ln 76, where "Preconditions" cannot be found. In
this project, im using the google web toolkit, which is shipped with the Preconditions-class,
what propably confuses the class-loader. Anyhow, when im trying the line shown above in netbeans,
without any references to gwt, it fails with the very same exception. 
> Any questions, suggestions, workarounds etc. appreciated, thanks. 

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