Axon Framework is a very mature solution for ES on the JVM. http://www.axonframework.org/ http://www.axonframework.org/ Here's the section of their manual rel

Axon Framework is a very mature solution for ES on the JVM. http://www.axonframework.org/ http://www.axonframework.org/ Here's the section of their manual related to this. http://www.axonframework.org/docs/2.4/repositories-and-event-stores.html#event-upcasting http://www.axonframework.org/docs/2.4/repositories-and-event... Akka Persistence is the other JVM ES framework that I'm familiar with. it supports upcasting as well. http://doc.akka.io/docs/akka/2.4/java/persistence-schema-evolution.html http://doc.akka.io/docs/akka/2.4/java/persistence-schema-evo...