findbugs2: 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/findbugs2 - from package: findbugs

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

Error in other languages:
findbugs2: bevel nie gevind nie
findbugs2: comandă negăsită
findbugs2: comando não encontrado
findbugs2: commande introuvable
findbugs2: command not found
findbugs2: käsku ei ole
findbugs2: không tìm thấy lệnh
findbugs2: komanda nerasta
findbugs2: Kommando nicht gefunden.
findbugs2: kommandot finns inte
findbugs2: komut yok
findbugs2: nie znaleziono polecenia
findbugs2: níor aimsíodh an t-ordú
findbugs2: no se encontró la orden
findbugs2: no s'ha trobat l'ordre
findbugs2: opdracht niet gevonden
findbugs2: parancs nem található
findbugs2: perintah tidak ditemukan
findbugs2: príkaz nenájdený
findbugs2: příkaz nenalezen
findbugs2: команда не найдена
findbugs2: командата не е открита
findbugs2: 命令找不到
findbugs2: コマンドが見つかりません