Java developers have run their code in Application Servers for many years. However, the cloud paradigm brought new ways to think and design applications. One example of this change is the Serverless architecture where event-driven code is executed on an ephemeral container managed by a 3rd party. It doesn't mean that there are no servers involved, but for the developer's perspective, it means that they don't need to worry about them.
Come to this session and learn FaaS - Function-as-a-Service, open source event driven lambda style programming model for Kubernetes.