jardetector: command not found

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On Debian possible default full paths are:

/usr/bin/jardetector - from package: jarwrapper

You may install the required package with command apt-get install {package}

Error in other languages:
jardetector: bevel nie gevind nie
jardetector: comandă negăsită
jardetector: comando não encontrado
jardetector: commande introuvable
jardetector: command not found
jardetector: käsku ei ole
jardetector: không tìm thấy lệnh
jardetector: komanda nerasta
jardetector: Kommando nicht gefunden.
jardetector: kommandot finns inte
jardetector: komut yok
jardetector: nie znaleziono polecenia
jardetector: níor aimsíodh an t-ordú
jardetector: no se encontró la orden
jardetector: no s'ha trobat l'ordre
jardetector: opdracht niet gevonden
jardetector: parancs nem található
jardetector: perintah tidak ditemukan
jardetector: príkaz nenájdený
jardetector: příkaz nenalezen
jardetector: команда не найдена
jardetector: командата не е открита
jardetector: 命令找不到
jardetector: コマンドが見つかりません