This package expects to be installed under the name Checkstyle.
git clone git@github.com:dskinner/SublimeCheckstyle.git Checkstyle
Requires Checkstyle to be available on the system. http://checkstyle.sourceforge.net/
Looks for checkstyle in $PATH by default but can be configured with sublime-settings to execute as appropriate per platform/setup.
View Preferences -> Package Settings -> Checkstyle -> Settings - Default for configuration options.