A presentation at Devoxx Ukraine by Oleg Šelajev
Productivity, Sustainability, and Fun in modern Java Oleg Šelajev @shelajev
Developer advocate atomicjar.com testcontainers.org
Modern
About Java releases 2 releases / year Oracle LTS every 4th release Multiple vendors GraalVM
Text blocks
Records
instanceof pattern matching
Switch expressions
Pattern matching for switch
Sealed classes
Fast
Copyright © 2021, Oracle and/or its affiliates
Startup Speed Peak Throughput JIT AOT Reduced Max Latency Low Memory Footprint Small Packaging
Native Image Build Process Input: All classes from application, libraries, and VM Application Output: Native executable Points-to Analysis Ahead-of-Time Compilation Libraries Code in Text Section Run Initializations JDK Substrate VM Heap Snapshotting Iterative analysis until fixed point is reached Image Heap Writing Image Heap in Data Section
Configuring Native Image build: Reflection, Proxies, JNI, Resources, etc https://medium.com/graalvm/working-with-native-image-efficiently-c512ccdcd61b
Configuring Native Image build: Reflection, Proxies, JNI, Resources, etc java -agentlib:native-image-agent=\ config-output-dir=META-INF/native-image \ -jar App.jar https://medium.com/graalvm/working-with-native-image-efficiently-c512ccdcd61b
https://medium.com/graalvm/graalvm-21-3-is-here-java-17-native-image-performance-updates-and-more-ac4cbafcfc05
Build tools • sbt native client • • • https://www.scala-sbt.org/1.x/docs/sbt-1.4-Release-Notes.html https://asciinema.org/a/wAAYjiO0TNW0V7dCSebMQB5wa mvnd • https://github.com/mvndaemon/mvnd
GraalVM Native Image Support in the AWS SDK for Java 2.x The test application creates an S3Client with ApacheHttpClient and sends a simple GetObjectRequest. In our testing, we measured the SDK 2.x startup time and the first request latency as well as the memory usage. https://aws.amazon.com/blogs/developer/graalvm-native-image-support-in-the-aws-sdk-for-java-2-x/
Writing Kubectl plugins with Scala or Java, with Fabric8 Kubernetes client on GraalVM Rewriting a kubectl plugin from a standard Go stack to a more comfortable approach with Scala has been challenging and rewarding. We are really happy with the result, and we arguably improved it in several ways. https://www.lightbend.com/blog/writing-kubectl-plugins-with-scala-or-java-with-fabric8-kubernetes-client-on-graalvm
Lightweight
Integration tests Testcontainers Database app Kafka API
🐋 https://medium.com/@bsideup/testing-your-docker-containers-with-testcontainers-and-groovy-3b9ef97ad1c2
Local environment Testcontainers Database app Kafka API
Testcontainers Cloud https://www.atomicjar.com/2021/11/announcing-testcontainers-cloud/
Fast Modern Lightweight *
Tools and best practices evolve faster than ever and while we learned to keep up with the faster Java release cadence, the rest of the ecosystem often poses a challenge.
Let’s look at some projects that highlight the recent developments in the Java ecosystem, that help us develop Java applications both faster and more efficiently.
We’ll look at some core features of modern application frameworks, try modern cloud IDEs, ensure our codebase is solid and stable with integration tests. We’ll use GraalVM native image for efficient and cloud-friendly deployment. And maybe even spice it up with other programming languages.
Java development has never been this productive, sustainable, lightweight, and enjoyable!
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