jh_classpath: 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/jh_classpath - from package: javahelper

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

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