the new release of SESSL (http://sessl.org), an embedded domain-specific language for simulation experiments, now integrates Opt4J 3.0 to support simulation-based optimization.
A sample experiment using JAMES II (http://jamesii.org) can be found here: https://gist.github.com/roland-ewald/5966558
Feedback and bug reports are welcome! :)
Nice to see some solid software engineering in research ;)
I will try to have a look soon.
Since you are using Maven, you could consider release to Maven central.