Just to clarify on windows, this works :-

java -cp "lib/*" %MAINCLASS%

where MAINCLASS of course is the class containing your main method.

This works on Windows:

java -cp "lib/*" %MAINCLASS% 

where %MAINCLASS% of course is the class containing your main method.

Alternatively:

java -cp "lib/*" -jar %MAINJAR% 

where %MAINJAR% is the jar file to launch via its internal manifest.