This document discusses exploring Quarkus on Java 17. It begins with an introduction and agenda, then discusses advantages of Java 17 like improved performance and container awareness. It outlines differentiators of Quarkus like developer joy through live coding, unified configuration, and standards-based libraries. Quarkus allows both imperative and reactive programming, has a fast startup time and small memory footprint, and supports many frameworks and extensions through its ecosystem. The document demonstrates Quarkus through a live coding demo.

1. Exploring Quarkus on JDK 17
Ana-Maria Mihalceanu
Developer Advocate
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2. Hello! I am Ana
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Java Champion, Certified Architect
Developer Advocate @ Red Hat
Passionate about solving complex scenarios involving Java-based
frameworks and multiple cloud providers.
ammbra1508

3. What we’ll be
discussing today
AGENDA
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Why use Java 17
Quarkus Differentiators
Demo
Q&A

4. Why use Java 17?
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Why use Java 17

5. JVM changes since Java 8
Why use Java 17
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More consistent
method run times
Default container
awareness
Observe running Java
apps at a low
performance cost
Multiple GCs
to choose from:
G1 , ZGC,
Shenandoah GC,
(Experimental) No-Op
Garbage Collector
Uses by default
memory restrictions
of a container.
Monitor and profile
with Java Flight
Recorder;
ingest and visualize that
data in Java Mission
Control

6. Work with delightful features
Why use Java 17
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Records Sealed classes Extended switch
expressions

7. Quarkus
Differentiators
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Quarkus differentiators

8. Differentiators
Quarkus differentiators
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Developer Joy
Live coding
Unified configuration
Continuous Testing & Dev Services
Best of Breed Libraries & Standards
90+ extensions
“Powered by Quarkus” applications
Container First
Tailors your app for HotSpot & GraalVM
Fast boot time and low RSS memory
Serverless fit
Unifies Imperative & Reactive
Combines blocking and non-blocking
Built-in event bus

9. Container First
Quarkus differentiators
9 https://quarkus.io/blog/runtime-performance/
https://quarkus.io/blog/io-thread-benchmark/
*Memory (RSS) in Megabytes, tested on a single-core machine
Quarkus
+ Native
12 MB
Quarkus + JVM
73 MB
Traditional
Cloud-Native Stack
136 MB
Reduced Memory
Footprint
Quarkus + Native (.016 secs)
Quarkus + JVM (0.943 secs)
Traditional
Cloud-Native
Stack (4.3 secs)
Fast Startup Time Smaller Disk
Footprint

10. Developer Joy
Quarkus differentiators
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A cohesive platform for optimized developer joy:
▸ Based on standards that make development and
learning codebases easier
▸ Unified configuration and Live coding
▸ Continuous Testing enables consistent testing.
▸ Dev Services offer zero config setup for some
databases and other services, like Kafka.
▸ Quicker iteration over features and fixes
▸ No hassle native executable generation

11. Unifies Imperative and Reactive
Quarkus differentiators
11 https://quarkus.io/blog/resteasy-reactive-smart-dispatch/
▸ Combine both Reactive and imperative development in the same application
▸ Inject the EventBus or the Vertx context
▸ Use the technology that fits your use-case
▸ Key for reactive systems based on event driven apps
@Inject
SayService say;
@GET
@Produces(MediaType.TEXT_PLAIN)
public String hello() {
return say.hello();
}
@Inject @Stream(”kafka”)
Publisher<String> reactiveSay;
@GET
@Produces(MediaType.SERVER_SENT_EVENTS)
public Publisher<String> stream() {
return reactiveSay;
}

12. Quarkus Universe: Best of Breed Frameworks & Standards
Quarkus differentiators
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Eclipse Vert.x Hibernate RESTEasy Apache Camel Eclipse MicroProfile Netty
Kubernetes OpenShift Jaeger Prometheus Apache Kafka Infinispan
Flyway Neo4j MongoDB MQTT KeyCloak Apache Tika

13. DEMO
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DEMO

14. Use the compiler of choice
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The red pill... Or the blue pill?

15. Start to code
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code.quarkus.io
quarkus ext add kubernetes

16. The code
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https://developers.redhat.com/articles/2021/1 2/14/explore-java-17-language-features-quarkus

17. Additional
resources
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More to learn from

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https://quarkus.io
@quarkusio
https://quarkusio.zulipchat.com

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Download
Modernizing Enterprise Java

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youtube.com/redhatdevelopers
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twitter.com/rhdevelopers
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