Repository layout

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I have 4 java projects that I am working on and needs some advice on how to
"best" setup the repository/repositories.
 
JavaProject1, JavaProject2, and JavaProject3 all have a dependency on
JavaProject4. In each project, there will be a src, docs, and classes folder
along with a variety of configuration files. Each project ends up as a jar
file so I also want to keep track of those.
 
I am not sure rather I should create 4 repositories or just 1. Any
suggestions on how to set this up? I'm not quite sure how to deal with the
jar files and the fact that projects 1-3 depend on the jar file from
project4.
 
Thanks in advance.