Reduce-side join

[abc xyz]

Hello 
everyone,

I am trying to use the hadoop's default 
reduce-side join. I want to use the TaggedMapOutput, DataJoinMapperBase, and 
DataJoinReducerBase classes. I have added the hadoop's datajoin jar file in my 
build path but still i get the following runtime error:

java.lang.NoClassDefFoundError: 
org/apache/hadoop/contrib/utils/join/TaggedMapOutput

Where 
possibly is the error? Please guide me.

Cheers