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Why these imports in AdviceClient class?

 
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Is there any Errata for Head First EJB?
In HFEJB page no-57 in AdviceClient.java i found few imports.

import javax.ejb.*;
import java.rmi.*;

i am not able to understand why above imports has been added to AdviceClient class.

Thanks
 
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Try to compile the code without the imports.
 
Gowher Naik
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i have tried without these imports and it compiles successfully.
So why are these imports there?
 
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