java - UDFRowSequence not working -

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i trying use auto increment udf (http://svn.apache.org/repos/asf/hive/trunk/contrib/src/java/org/apache/hadoop/hive/contrib/udf/udfrowsequence.java)

i getting error when used udf.

error :

on hive console - 

exception in thread 60 - java nullpointer exception  on hadoop web ui - error in configuring object .....caused java,reflect.invocation..

does used udf? wondering if udf runs in map phase how able give unique numbers each row?

it worked fine me . how executing ?

as can see launches single mapper process, why can give unique numbers each row.


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