Yes, Java is supported. Like the other comment, anything you can run in a Docker container, which is pretty much any language. It also supports the same format/structure as Lambda in Java.

It is built on top of Docker, so if you dockerize a Java application, it just works.

It does work also with Java lambda apps, you can import them straight from AWS Lambda API using the CLI app.

Anything in docker container would work i suppose

you can import your AWS Java code using the command line https://github.com/iron-io/functions/blob/master/docs/lambda...