How to override packages src/ files ?

Hello everybody,

How to override any package's src file ? By just copying into application/src and changing namespace of it accordingly it is not working ? So what is the proper way of doing it ? Can anyone please help me in it

I also searched in site i found many links as this :
but nothing works


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jerryscott replied on at Permalink Reply
I had a similar situation/question. Any help would be appreciated.