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https://issues.apache.org/jira/browse/MAPREDUCE-3965?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13221594#comment-13221594
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Steve Loughran commented on MAPREDUCE-3965:
-------------------------------------------
This is triggered if the Class passed down to the map class is class
{{java.lang.Class}}
{code}
job.setJarByClass(Class.class);
{code}
Groovy seems to trigger it for other reasons
> 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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