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Posted to common-user@hadoop.apache.org by chaitanya krishna <ch...@gmail.com> on 2008/05/01 15:28:58 UTC
ClassNotFoundException while running jar file
Hi,
I wanted to run my own java code in hadoop. The following are the commands
that I executed and errors occurred.
mkdir temp
javac -Xlint -classpath hadoop-0.16.0-core.jar -d temp
GetFeatures.java (GetFeatures.java is the code)
jar -cvf temp.jar temp
bin/hadoop jar temp.jar GetFeatures input/input.txt out
ERROR:
Exception in thread "main" java.lang.ClassNotFoundException: GetFeatures
at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:242)
at org.apache.hadoop.util.RunJar.main(RunJar.java:148)
can you interpret the possible reason for the error?
Thank you.
Re: ClassNotFoundException while running jar file
Posted by Jason Venner <ja...@attributor.com>.
You need to add your class or a class in your jar to the constructor for
your JobConf object.
?????????????????????????????????????????????????????????
? JobConf(Class exampleClass) ?
? Construct a map/reduce job configuration. ?
?????????????????????????????????????????????????????????
? JobConf(Configuration conf, Class exampleClass) ?
? Construct a map/reduce job configuration. ?
?????????????????????????????????????????????????????????
JobConf
public JobConf(Class exampleClass)
Construct a map/reduce job configuration.
Parameters:
*exampleClass - a class whose containing jar is used as the
job's jar.
*
JobConf
public JobConf(Configuration conf,
Class exampleClass)
Construct a map/reduce job configuration.
Parameters:
conf - a Configuration whose settings will be inherited.
* exampleClass - a class whose containing jar is used as the
job's jar.*
chaitanya krishna wrote:
> Hi,
>
> I wanted to run my own java code in hadoop. The following are the commands
> that I executed and errors occurred.
>
> mkdir temp
>
> javac -Xlint -classpath hadoop-0.16.0-core.jar -d temp
> GetFeatures.java (GetFeatures.java is the code)
>
> jar -cvf temp.jar temp
>
> bin/hadoop jar temp.jar GetFeatures input/input.txt out
>
> ERROR:
>
>
> Exception in thread "main" java.lang.ClassNotFoundException: GetFeatures
> at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
> at java.security.AccessController.doPrivileged(Native Method)
> at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
> at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
> at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
> at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
> at java.lang.Class.forName0(Native Method)
> at java.lang.Class.forName(Class.java:242)
> at org.apache.hadoop.util.RunJar.main(RunJar.java:148)
>
>
> can you interpret the possible reason for the error?
>
> Thank you.
>
>
--
Jason Venner
Attributor - Program the Web <http://www.attributor.com/>
Attributor is hiring Hadoop Wranglers and coding wizards, contact if
interested