I noticed that the DigitalOcean plugin is using version 1 of the API. I just wanted to give you a heads up that v1 has been deprecated and will be sunset on November 1st 2015:

https://developers.digitalocean.com/documentation/changelog/api-v1/sunsetting-api-v1/

It looks like the underlying Java client used already provides support for v2 of the API:

https://github.com/jeevatkm/digitalocean-api-java

The documentation for version 2 of the DigitalOcean can be found here:

https://developers.digitalocean.com/documentation/v2/