jh_exec: command not found

Have You tried accessing the binary with the full path?

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

[root@server ~]# echo $PATH

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/jh_exec - from package: javahelper

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