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Posted to dev@mahout.apache.org by "bernd hopp (JIRA)" <ji...@apache.org> on 2011/03/01 13:00:37 UTC
[jira] Created: (MAHOUT-615) unable to instanciate
FastByIDMap, ClassNotFoundException for
com.google.common.base.Preconditions
unable to instanciate FastByIDMap<PreferenceArray>, ClassNotFoundException for com.google.common.base.Preconditions
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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: Benson Margulies
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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[jira] Resolved: (MAHOUT-615) unable to instanciate
FastByIDMap, ClassNotFoundException for
com.google.common.base.Preconditions
Posted by "Sean Owen (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/MAHOUT-615?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Sean Owen resolved MAHOUT-615.
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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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[jira] Commented: (MAHOUT-615) unable to instanciate
FastByIDMap, ClassNotFoundException for
com.google.common.base.Preconditions
Posted by "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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For more information on JIRA, see: http://www.atlassian.com/software/jira