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Posted to common-user@hadoop.apache.org by novice user <pa...@gmail.com> on 2008/06/09 12:23:26 UTC

Getting "No job jar file set. User classes may not be found." error when running a map-reduce job in hadoop-0.17

Hi,
 I am running a simple code and I am getting error as " No job jar file set. 
User classes may not be found. See JobConf(Class) or
JobConf#setJar(String)".  I am not able to figure what would have gone
wrong. 
Some details of the problem are:
I have recently upgraded hadoop to 0.17.
I have set new JobConf(Sample.class). Where Sample.class is the class from
where I am running this job. 
also tried with jobconf.setJarByClass(Sample.class) too. 

Can some one please help me in this regard?

Thanks

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Re: Getting "No job jar file set. User classes may not be found." error when running a map-reduce job in hadoop-0.17

Posted by montag <mk...@about.com>.
I've had this error as well when running from the command prompt.  I've found
that by passing the location of the jar file that contains your classes to
conf.setJar() when setting the job configuration parameters fixes it. 
Basically the code would look something like this:


String userJarLocation = "/path/to/jar";
conf.setJar(userJarLocation); //were conf is the JobConf object

-Mike


novice user wrote:
> 
> Hi Brice,
>   I tried by not using eclipse too. I created my own jar file using
> build.xml and used this jar when passing to hadoop jar command. But still
> the error is persisting. 
> 
> un_brice wrote:
>> 
>> novice user a écrit :
>>> Hi,
>>>  I am running a simple code and I am getting error as " No job jar file
>>> set. 
>>> User classes may not be found. See JobConf(Class) or
>>> JobConf#setJar(String)".  I am not able to figure what would have gone
>>> wrong. 
>> Hi !
>> 
>> I got the same warning when running jobs from Eclipse, because Eclipse 
>> weren't trying to build jars (but just .class). It didn't prevent me to 
>> test my code using the ToolRunner however. To distribute it, I wrote a 
>> ant build.xml file that built the Jar. I suppose that you could also use 
>> the export tool of Eclipse.
>> 
>> Good luck ^^
>> Brice
>> 
>> 
> 
> 

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Re: Getting "No job jar file set. User classes may not be found." error when running a map-reduce job in hadoop-0.17

Posted by novice user <pa...@gmail.com>.
Hi Brice,
  I tried by not using eclipse too. I created my own jar file using
build.xml and used this jar when passing to hadoop jar command. But still
the error is persisting. 

un_brice wrote:
> 
> novice user a écrit :
>> Hi,
>>  I am running a simple code and I am getting error as " No job jar file
>> set. 
>> User classes may not be found. See JobConf(Class) or
>> JobConf#setJar(String)".  I am not able to figure what would have gone
>> wrong. 
> Hi !
> 
> I got the same warning when running jobs from Eclipse, because Eclipse 
> weren't trying to build jars (but just .class). It didn't prevent me to 
> test my code using the ToolRunner however. To distribute it, I wrote a 
> ant build.xml file that built the Jar. I suppose that you could also use 
> the export tool of Eclipse.
> 
> Good luck ^^
> Brice
> 
> 

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Re: Getting "No job jar file set. User classes may not be found." error when running a map-reduce job in hadoop-0.17

Posted by Brice Arnould <br...@gmail.com>.
novice user a écrit :
> Hi,
>  I am running a simple code and I am getting error as " No job jar file set. 
> User classes may not be found. See JobConf(Class) or
> JobConf#setJar(String)".  I am not able to figure what would have gone
> wrong. 
Hi !

I got the same warning when running jobs from Eclipse, because Eclipse 
weren't trying to build jars (but just .class). It didn't prevent me to 
test my code using the ToolRunner however. To distribute it, I wrote a 
ant build.xml file that built the Jar. I suppose that you could also use 
the export tool of Eclipse.

Good luck ^^
Brice