javareconf: 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/lib64/R/bin/javareconf - from package: R-core
/usr/lib/R/bin/javareconf - from package: R-core

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

On Debian possible default full paths are:

/usr/lib/R/bin/javareconf - from package: r-base-core

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

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