Jstan is a Java library for running MCMC models with Stan (https://mc-stan.org), a state of the art statistical modeling and high performance computation engine.
This library allows you to create, compile and run models with the JVM. Complex bayesian data analysis problems have typically been relegated to python, R, etc, where implemention is far from production.
The goal of this project to be added to the offical list of implementations with the Stan project, so that JVM language users will have access to the power of Stan from the JVM.