thread "main" java.lang.ClassNotFoundException - exception

Question

Trying to run a job, but i keep getting this error. I do not know how to resolve it. Is there something im missing? What is wrong here?
This is in my shell
[cloudera#localhost home]$ hadoop jar cloudera/MinMaxCountDriver.jar MinMaxCount /user/cloudera/Comments.xml /user/cloudera/SuperUserXML/
This is the error i am getting
Exception in thread "main" java.lang.ClassNotFoundException: MinMaxCount
....
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:247)
at org.apache.hadoop.util.RunJar.main(RunJar.java:201)
Here is my driver.
public class MinMaxCountDriver {
public static void main(String []args) throws Exception
{
Configuration conf = new Configuration();
String [] otherArgs = new GenericOptionsParser(conf, args).getRemainingArgs();
if(otherArgs.length !=2 )
{
System.err.println("You need 2 Arguement");
System.exit(2);
}
...
FileInputFormat.addInputPath(job, new Path(otherArgs[0]));
FileOutputFormat.setOutputPath(job, new Path(otherArgs[1]));
System.exit(job.waitForCompletion(true)? 0: 1);
}
}

Answer 1

Basic command to run MR jobs is
hadoop jar myjar.jar classname inputfolder outputfolder
For me it works without classname also
myproject
|
|
-----> mypackage
|
|
---->Driver.java
|
|
---->Mapper.java
|
|
---->Reducer.java
If this is the tree I need not want to specify the classname
hadoop jar driver.jar in out
But
myproject
|
|
-----> mypackage
| |
| |
| ---->Driver.java
| |
| |
| ---->Mapper.java
| |
| |
| ---->Reducer.java
|
----> mypackage2
|
|
---->Driver2.java
|
|
---->Mapper2.java
|
|
---->Reducer2.java
For this I need to specify my classname which driver class I am trying to execute.
hadoop jar driver2.jar mypackage2.Driver2 in out

Answer 2

Each class in the .jar has [package MapRedDesign;] at the top.
Based on your comments, make sure you fully qualify your class name with the package, otherwise Java will have no idea where to find it.
hadoop jar cloudera/MinMaxCountDriver.jar MapRedDesign.MinMaxCount /user/cloudera/Comments.xml /user/cloudera/SuperUserXML/