Java Programm soll von Nagios ausgefuehrt werden

import java.io.BufferedReader;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;

public class Upload {

        /**
         * @param args
         */
        public static void main(String[] args) throws FileNotFoundException, IOException{
                // TODO Auto-generated method stub

                String upload = "Upload was successfull";

                          try {
                                        BufferedReader in = new BufferedReader(new FileReader("/tmp/orc_backup.log"));
                                        String zeile = null;
                                        while ((zeile = in.readLine()) !=  null) {
                                                //System.out.println("Gelesene Zeile: " + zeile);
                                                if (zeile.equals(upload)) {
                                                        System.out.println(zeile);
                                                        System.exit(0);
                                                }
                                        }
                                } catch (IOException e) {
//                                      e.printStackTrace();
                                System.exit(3);
                                }
        }
}

Remote command execution failed:

/usr/local/nagios/libexec/check_by_ssh -H xxx -s "FTP_BACKUP" -C '/usr/bin/java /usr/nagios/java_work/Upload'

/usr/bin/java /usr/nagios/java_work/Upload

Auf der Maschine, wo das Programm liegt: 

/usr/bin/java /usr/nagios/java_work/Upload
Exception in thread "main" java.lang.NoClassDefFoundError: /usr/nagios/java_work/Upload

Im Verzeichnis, wo das Programm liegt:

java Upload
Upload was successfull

Und wenn ich es direkt von Nagios aus ausfuehre, kommt jeweils dieselbe Fehlermeldung

/usr/bin/java /usr/nagios/java_work/Upload
Remote command execution failed: @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@

bzw.

java /usr/nagios/java_work/Upload
Remote command execution failed: @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@

/usr/bin/java /usr/nagios/java_work/Upload
Exception in thread "main" java.lang.NoClassDefFoundError: /usr/nagios/java_work/Uploa