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From "Steve Loughran (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-3965) JobConf.findContainingJar NPEs if it can't find the classloader of a class
Date Sat, 03 Mar 2012 14:07:57 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-3965?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13221592#comment-13221592
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Steve Loughran commented on MAPREDUCE-3965:
-------------------------------------------

stack trace
{code}

     [java] Exception in thread "main" java.lang.NullPointerException
     [java] 	at org.apache.hadoop.mapred.JobConf.findContainingJar(JobConf.java:1792)
     [java] 	at org.apache.hadoop.mapred.JobConf.setJarByClass(JobConf.java:426)
     [java] 	at org.apache.hadoop.mapreduce.Job.setJarByClass(Job.java:133)
     [java] 	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
     [java] 	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
     [java] 	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
     [java] 	at java.lang.reflect.Method.invoke(Method.java:597)
     [java] 	at org.codehaus.groovy.reflection.CachedMethod.invoke(CachedMethod.java:90)
     [java] 	at groovy.lang.MetaMethod.doMethodInvoke(MetaMethod.java:233)
     [java] 	at groovy.lang.MetaClassImpl.setProperty(MetaClassImpl.java:2388)
     [java] 	at groovy.lang.MetaClassImpl.setProperty(MetaClassImpl.java:3312)
     [java] 	at org.smartfrog.services.hadoop.grumpy.GrumpyJob.setProperty(GrumpyJob.groovy)
     [java] 	at org.codehaus.groovy.runtime.ScriptBytecodeAdapter.setGroovyObjectProperty(ScriptBytecodeAdapter.java:528)
     [java] 	at org.smartfrog.services.hadoop.bluemine.jobs.BluemineJob.createBasicJob(BluemineJob.groovy:51)
     [java] 	at org.smartfrog.services.hadoop.bluemine.jobs.BluemineJob$createBasicJob.call(Unknown
Source)
     [java] 	at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:42)
     [java] 	at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:108)
     [java] 	at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:128)
     [java] 	at org.smartfrog.services.hadoop.bluemine.jobs.DevCount.main(DevCount.groovy:95)
{code}
                
> 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
>         Environment: Setting up a job under Groovy
>            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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