Extending ExpensesCO.class controller

Hi Guys,
I am totally new to this technology, I need to extend the controller ExpensesCO.class.
Can you please tell me how to start with this extenson. I have installed correct jdeveloper version and tested connectivity and all.
But when i am trying to open this class in Jdev, i dont see the query that i have to modify.
I can see the query in the ExpenseTemplatesVO.xml.
To start the customization, do i need to copy all files from Java Top/ap/oie to my personal system in the same structure.
I need guidance on how to start up with this cutomization , like do i need to copy all files in my personal system and how do i test , by copying only the modified file etc etc.
any adice is much appreciated.
Thansk
Sunil

See the steps of Controller Extension:
http://oracleanil.blogspot.com/2010/09/controller-extension-r12-oaf.html
Also let us know your requirement so that we can suggest you whether you have to go for Controller or VO Extension or NOT.
Thanks
--Anil
http://oracleanil.blogspot.com

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>
When I compile above java code it gives error "cannot find symbol. symbol: class DefaultInterface".
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>
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So you can't reference that type by importing it because you can't import a type that doesn't have a canonical nmae. And you can't just use the simple name because, as the first statement above says you have to import it to use the simple name.
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