Adding to classpath
I just am trying to setup moj with Sublime text editor in Mac
Step 3 says "Add codeprocessor.jar, moj.jar and fileedit.jar to the classpath" How do I do that in a Mac machine? I tried CLASSPATH=$CLASSPATH:$JAR_PATH command for all 3 jars
Now echo $CLASSPATH shows

If I try step4, I get an error as java.lang.InstantiationError: Cannot instantiate fileedit.EntryPoint.java.lang.ClassNotFoundException: fileedit.EntryPoint

You shouldn't need to alter CLASSPATH. The configuration dialog before this one (where you add CodeProcessor as a plugin) has a class path field that you add FileEdit and moj to.
The CLASSPATH approach might work but you might need to specify absolute paths to the jars.