jjdoc: 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 CentOS possible default full paths are:

/usr/bin/jjdoc - from package: javacc

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/bin/jjdoc - from package: javacc

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

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