Convert Datastream to Collector or List

[Ahmed Nader]

Hi,
I want to pass an object of type DataStream ,after applying map function on
it, as a parameter to be used somewhere else. But when i do so, i get an
error message of trying to access a null context object.
Is there a way that i can convert this DataStream object to a list or a
collector so as to be used somewhere else afterwards.
Thanks,
Ahmed