If you want to learn more about GraalVM in an interactive way, the GraalVM workshop is strongly recommended. In the remainder of this blog, you will create a basic Spring Boot application and create a GraalVM image for it. As from Spring Boot 3, Spring Native is part of Spring Boot and out of the experimentation phase. Spring Boot had an experimental project called Spring Native which helps Spring Boot developers to create native images. GraalVM can compile your Java applicaton into a native image. This results in a faster startup time, lower memory footprint and a lower CPU usage. You do not need a JVM anymore and no JIT compilation. With AOT, you can create an executable or “native image” for your target platform. This is where ahead-of-time compilation (AOT) can help. In this use case, the JIT compilation takes up unnecessary time because you already know which platform you are running. Every time the Lambda starts, the JIT compiler needs to do its work. When a request needs the AWS Lambda to run, the Lambda needs to start up very fast, execute and then shutdown again. AWS Lambda’s are not running when there is no application activity. An example is an AWS Lambda written in Java. As you will understand, this conversion takes some time during startup.Īssume you have a use case where fast startup time is very important. This is done by the just-in-time compiler (JIT). When you start your Java application, the Virtual Machine will convert the bytecode into bytecode specific for the platform, called native machine code. Bytecode is computer object code which an interpreter (read: Virtual Machine) can interpret and convert to machine code. Java is portable because Java compiles your code to bytecode. Write once, run anywhere! But this comes at a cost. Java is a great programming language and is platform independent. Following these practical steps, you will be able to apply them to your own Spring Boot application. In this blog, you will learn how to build a GraalVM image for your Spring Boot application.
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