gcj-wrapper: command not found

Have You tried accessing the binary with the full path?

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/gcj-wrapper - from package: gcj-jdk

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