gcjh: 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/gcjh - from package: gcc-java

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

On Debian possible default full paths are:

/usr/bin/gcjh - from package: gcj-jdk

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

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