Neomake classpath not being set

Question

I'm having trouble setting my Java classpath in Neomake.

My .jar files are in ~/Github/shadow-blocks/lib

and .java files in ~/Github/shadow-blocks/src/project1.

I've tried both

let g:neomake_java_javac_args = ['-cp', '/home/liam/Github/shadow-blocks/lib:/home/liam/Github/shadow-blocks/src/project1']

let g:neomake_java_javac_args = ['-cp', '/home/liam/Github/shadow-blocks/lib/*:/home/liam/Github/shadow-blocks/src/project1/*']

in my vimrc, but Neomake still throws javac import errors at me when it lints my .java files.

I'm using an expanded home path as there have been issues reported with using ~ with Neomake.

I have no idea what I'm doing wrong, help very appreciated. Thanks!