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2 Question about Cade's Class Diagram

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Dear all,
I'm using Cade's Diagram as guideline to build my Class Diagram for part II.

I can see in that diagram that Session Beans -like- "SearchProcessor" instead of a relationship, have a dependency ( - - - - > with other classes. Is it correct ? is it because they aren't entity but just components that instantiate other entities ?

Also, the ShoppingCart has a bi-directional relationship (straight line, no arrow) with the customer...why ? what does it mean ?

Thanks in advance
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