First of all thank you for rsmq, it's an amazingly simple message queue solution. Due to it's simplicity it's a good way to share a message queue layer in different technologies.

In our case, Java was sending messages to Node.js in the same infrastructure, therefore we decided to implement (port) this project. It's available here https://github.com/wedeploy/jrsmq. We've tried to keep the api as similar as possible. If you are interested we can support it as the official Java version.