Collaboration Diagram

Hi everybody.
I have a Java project and I want to reverse-engineer the
source code to create the class and collaboration diagrams.
I create the class diagram for a selected package and then I
add all the classes of the namespace.
I have two questions:

1. actually I have to repeat the class diagram creation for
all of the package in my project: is it possible to create an unique
class diagram for the entire project?

2. When I try to create a collaboration diagram, it is empty, and I
cannot include the classes of the namespace, like on the class diagram.
Is it possible to create a non-empty collaboration diagram from
existing source code?

Thanks in advance.

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