I don't there's any rest api to deploy the model again, with activiti-7 you'll have to deploy it by restarting your server. but there are apis to connect with the runtime bundle, you can see the model deployed but you cannot modify it. source
Thanks for the respond, that's exactly what I've done from Spring Boot but I always get error 403 forbidden. So I really don't understand why is this operation not allowed, do you have any explanation about this ?