What is the advantage of using Wrapper Classes ?

Hi friends,
I am happy to join Java/J2EE tech. My project is
scaled over the network. MVC-II struts, EJB based
architecture, we are using.
We are asked to use Wrapper Classes in in Java
programs and not the primitive data types. I could
not understand the reason.
Pls tell me what is the advantage of using Wrapper
Classes over the primitive data types ?
means Integer instead of int, etc....I am not sure why use Integer over int; but Wrapper classes are used to remove coupling between classes and create one hand doesn't know what the other hand does effect.
for example:
when you have a SFTP java package but doesn't do everything that your application needs to do in one step and you need to do sftp stuff at many places in your application, it would be wise not to use SFTP java package directly from all the classes that need to do sftp stuff. Because if you were to change the SFTP package later due to say some bug fix or newer version or ... you would have to go and modify all the classes that had sftp stuff to update.
Instead you could write a custom sftp wrapper that handles all the sftp stuff for your application needs and that wrapper deals with the SFTP java package. So all the classes don't need to know which SFTP java package is being used only the custom-wrapper needs to know.

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a) Data : itab like mara occurs 0 with header line.
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ab type c,
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Regards,
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