I see now that I have an appletviever in the location you specified. When I try 'appletviewer Linser.java' or "appletviewer Linser.class' , I get nothing at all. The terminal does not spit out anything, but sun.applet.main flashes for half a second in the bar in the top of osx where the current application is displayed. It works fine in netbeans and on the solaris system in my school... Hm.
Is there something wrong with my command? I also tried 'open Linser.class appletviewer' and also experimented with -a -J flags.