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jonashackt / repository
This example project shows how to compile a Webflux based Spring Boot application into a Native App using GraalVM Native Image locally & on GitHub Actions with & without Docker
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This example project shows how to compile a Webflux based Spring Boot application into a Native App using GraalVM Native Image
This project here shows a technical demo of what's possible right now - stable GraalVM Native Image support for Spring Boot could be expected with Spring Frameworks 5.3 release planned in October 2020, on which Spring Boot 2.4 will be based.
A live deployment is available on Heroku:
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dev-naman /
This project demonstrates a simple CI/CD workflow for a Java Maven application using GitHub Actions and Jenkins. The application is containerized using Docker, showcasing modern DevOps practices including automated builds, testing, and containerization. The goal of this project is to provide a lightweight example of Continuous Integration
37/100 healthThis project is used as example in some articles:
Current status of Spring's Graal support:
Note: GraalVM is an umbrella for many projects - if we want to fasten the startup and reduce the footprint of our Spring Boot projects, we need to focus on GraalVM Native Image.
There are some good intro resources - like the Running Spring Boot Applications as GraalVM Native Images talk @ Spring One Platform 2019 by Andy Clement.
One could tell Native Image to initialize Java classes
# at build time:
native image --initialize-at-build-time=your.package.YourClass
# or at runtime
native image --initialize-at-run-time=your.package.YourClass
GraalVM Native Image supports:
Andy Clement also seems to lead a Spring experimental project, that provides a Graal @AutomaticFeature for typical Spring application: https://github.com/spring-projects-experimental/spring-graalvm-native
There are also already some example projects available: https://github.com/spring-projects-experimental/spring-graalvm-native/tree/master/spring-graalvm-native-samples
Let's install GraalVM with the help of SDKMAN. Therefore you need to have SDKMAN itself installed:
curl -s "https://get.sdkman.io" | bash
source "$HOME/.sdkman/bin/sdkman-init.sh"
If SDKMAN has been installed successfully, the following command should work:
$ sdk list java
================================================================================
Available Java Versions
================================================================================
Vendor | Use | Version | Dist | Status | Identifier
--------------------------------------------------------------------------------
AdoptOpenJDK | | 14.0.0.j9 | adpt | | 14.0.0.j9-adpt
| | 14.0.0.hs | adpt | | 14.0.0.hs-adpt
| | 13.0.2.j9 | adpt | | 13.0.2.j9-adpt
...
GraalVM | >>> | 20.2.0.r11 | grl | installed | 20.2.0.r11-grl
| | 20.2.0.r8 | grl | | 20.2.0.r8-grl
| | 20.1.0.r11 | grl | | 20.1.0.r11-grl
| | 20.1.0.r8 | grl | | 20.1.0.r8-grl
| | 20.0.0.r11 | grl | | 20.0.0.r11-grl
| | 20.0.0.r8 | grl | | 20.0.0.r8-grl
| | 19.3.1.r11 | grl | | 19.3.1.r11-grl
| | 19.3.1.r8 | grl | | 19.3.1.r8-grl
...
The list itself is much longer and you could see the wonderful simplicity of this approach: Don't ever mess again with JDK installations!
Now to install GraalVM based on JDK11, simply run:
sdk install java 20.2.0.r11-grl
SDKMAN now installs GraalVM for us. To have the correct PATH configuration in place, you may need to restart your console. If everything went fine, you should see java -version react like this:
$ java -version
openjdk version "11.0.8" 2020-07-14
OpenJDK Runtime Environment GraalVM CE 20.2.0 (build 11.0.8+10-jvmci-20.2-b03)
OpenJDK 64-Bit Server VM GraalVM CE 20.2.0 (build 11.0.8+10-jvmci-20.2-b03, mixed mode, sharing)
GraalVM brings a special tool gu - the GraalVM updater. To list everything thats currently installed, run
$ gu list
ComponentId Version Component name Origin
--------------------------------------------------------------------------------
graalvm 20.2.0 GraalVM Core
Now to install GraalVM Native image, simply run:
gu i