ajbrowser: 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/ajbrowser - from package: aspectj

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

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