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Date: Sat, 3 Mar 2012 14:13:57 +0000 (UTC)
From: "Steve Loughran (Updated) (JIRA)" <jira@apache.org>
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Subject: [jira] [Updated] (MAPREDUCE-3965) JobConf.findContainingJar NPEs if
 it can't find the classloader of a class
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     [ https://issues.apache.org/jira/browse/MAPREDUCE-3965?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Steve Loughran updated MAPREDUCE-3965:
--------------------------------------

          Environment: Setting up a job under Groovy, OSX10.7, job started by ant's <java> with fork==true   (was: Setting up a job under Groovy)
    Affects Version/s: 1.0.0
    
> JobConf.findContainingJar NPEs if it can't find the classloader of a class
> --------------------------------------------------------------------------
>
>                 Key: MAPREDUCE-3965
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-3965
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>    Affects Versions: 1.0.0
>         Environment: Setting up a job under Groovy, OSX10.7, job started by ant's <java> with fork==true 
>            Reporter: Steve Loughran
>            Priority: Minor
>
> I never knew that classes may not have classloaders, but it turns out they can -in which case Object.getClass().getClassLoader() will be null "This method will return null in such implementations if this class was loaded by the bootstrap class loader.""
> When this (rare) situation arises, {{JobConf.findContainingJar()}} NPEs, when failing with a slightly more useful error message would be preferred.

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