Get Started with Java Serverless Functions

Get Started with Java Serverless Functions

The serverless Java journey started out with functions. Before Java developers can start developing new serverless functions, their first task is to choose a new cloud-native Java framework. Get started with Java serverless functions.

Quarkus allows you to develop serverless workloads with familiar Java technology.

The  serverless Java journey started out with functions—small snippets of code running on demand. This phase didn't last long. Although functions based on virtual machine architecture in the 1.0 phase made this paradigm very popular, as the graphic below shows, there were limits around execution time, protocols, and poor local-development experience.

Developers then realized that they could apply the same serverless traits and benefits to microservices and Linux containers. This launched the 1.5 phase, where some serverless containers completely abstracted  Kubernetes, delivering the serverless experience through  Knative or another abstraction layer that sits on top of it.

In the 2.0 phase, serverless starts to handle more complex orchestration and integration patterns combined with some level of state management. More importantly, developers want to keep using a familiar application runtime, Java, to run a combination of serverless and non-serverless workloads in legacy systems.

Before Java developers can start developing new serverless functions, their first task is to choose a new cloud-native Java framework that allows them to run Java functions quicker with a smaller memory footprint than traditional monolithic applications. This can be applied to various infrastructure environments, from physical servers to virtual machines to containers in multi- and hybrid-cloud environments.

Developers might consider an opinionated Spring framework that uses the java.util.function package in  Spring Cloud Function to support the development of imperative and reactive functions. Spring also enables developers to deploy Java functions to installable serverless platforms such as  Kubeless,  Apache OpenWhisk,  Fission, and  Project Riff. However, there are concerns about slow startup and response times and heavy memory-consuming processes with Spring. This problem can be worse when running Java functions on scalable container environments such as Kubernetes.

Quarkus is a new open source cloud-native Java framework that can help solve these problems. It aims to design serverless applications and write cloud-native microservices for running on cloud infrastructures (e.g., Kubernetes).

java serverless kubernates function quarkus knative

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