[jira] Commented: (MAHOUT-615) unable to instanciate FastByIDMap, ClassNotFoundException for com.google.common.base.Preconditions

["bernd hopp (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/MAHOUT-615?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13001956#comment-13001956 ] 

bernd hopp commented on MAHOUT-615:
-----------------------------------

yes, you where right, thanks. Besides Guava, I needed log4J and uncommons.math to get mahout up and running. This is obviously not an issue in mahout itself, but a hint at the download-page may prevent others from running into the same problem. 

> 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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