http://www.sparkjava.com/
https://github.com/perwendel/spark

http://nordicapis.com/using-spark-to-create-apis-in-java/
https://www.reddit.com/r/java/comments/3hc5u2/using_spark_to_create_apis_in_java_nordic_apis/

2018
https://habrahabr.ru/post/352732/