First off, applets are GUIs. You can’t run GUIs on the remove command line.
Second off, that’s because the first argument to any java command line is the class name. ClassNames change are stored via dot notation mapped to directories. Class.SubClass will be in Class/SubClass.java.
What you want is:
java --classpath=/home/user/webaddress.com/myapplet anapplet
Note, you set the classpath to the directory your file is in. Then you specify the main class name as the first argument. All additional arguments will be passes as parameters to your main() method.
yerba# rm -rf /etc