findbugs: 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/findbugs - from package: findbugs

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

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