run.jar: 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/share/activemq/bin/run.jar - from package: activemq

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

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