I cloned a git java project with Eclipse, but I get many errors because I cant resolve these imports:
Eclipse IDE for Java Developers does not contain the Eclipse Plugin Development Environment needed to build and run this project.
You can install it using 'Help > Install New Software'. Work with the main site for your version of Eclipse (Mars in your case) and install 'Eclipse Plugin Development Environment'.
Note that the code you are trying to build is an Eclipse plugin and will only run as part of Eclipse.