GeeCon Prague 2023 - Unleash the power of your applications with Micronaut®, GraalVM, and the Oracle Database

1. Unleash the power of your
applications with
Micronaut®, GraalVM, and
the Oracle Database
Juarez Álvares Barbosa Junior
Senior Principal Java Developer Evangelist
Oracle
@juarezjunior

2. Juarez Álvares Barbosa Junior
Senior Principal Java Developer Evangelist
• Coming from Dublin, Ireland
• Developer since 1995 (Java ☕️ 1997)
• 28 years of experience in SW Engineering & DevRel
• Microsoft, Oracle, IBM, Nokia, Unisys, Accenture, startups
• Microsoft Azure Developer Relations Lead
• IBM Watson Tech Evangelist & Cloud Rockstar
• IBM Mobile Tech Evangelist & Global Thought Leader
• Nokia Developers Global Champion
• Java, Python, Cloud, DevOps, SRE, Cloud-native, IoT, AI,
Blockchain, Rust
• Speaker at conferences
• Oracle CloudWorld, Oracle Code, Microsoft Ignite, Microsoft
TechX, jPrime, JCON, DevConf.cz, DevOpsDays, DeveloperWeek,
DevOps Institute, CloudLand, DWX, The Developer’s Conference
(TDC), Sec4Dev, JSNation, NodeConf, Conf42, Shift Conf, Global
Azure, Open-Source Lisbon, CodeFrenzy, Mêlée Numérique,
React Summit, Test.js Summit, Pyjamas, JUGs, meetups, etc.
@juarezjunior
@juarezjunior

3. Slides available on slideshare
3 Copyright © 2022, Oracle and/or its affiliates

4. Copyright © 2022, Oracle and/or its affiliates.
Micronaut® is a registered trademark of Object Computing, Inc. Use is for referential purposes and does not imply any endorsement or affiliation with any third-party product.
4

5. Introduction to Micronaut
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5
Micronaut is a complete
solution for any type of
application: microservices,
message-driven producers or
consumers, command-line
apps, serverless functions,
etc.
All application types
Micronaut leverages Java
annotation processors and
other optimisations to
compute the framework
infrastructure at compile-
time, drastically reducing
startup time and memory
consumption.
Highly optimised
Modern Java Framework
Micronaut has been designed
from scratch in 2017, focused
on modern architectures like
microservices and serverless,
and with the cloud in mind.

6. Micronaut computes at build time:
• All dependency and configuration injection.
• Annotation metadata (meta annotations)
• AOP proxies.
• Bean introspections.
• All other framework infrastructure.
At runtime:
• No reflection.
• No proxy generation.
• No dynamic classloading.
• No classpath scanning.
AOT: Ahead Of Time
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6

7. 7
Any language, build tool, test framework, reactive library, cloud, …
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8. Micronaut features
1. Dependency injection.
• Can use JSR-330 (@Inject) or Spring (@Autowired) annotations.
2. Configuration.
• Properties, YAML, TOML, Groovy, Config4K.
3. Validation support.
• Built-in: reflection-free, faster startup, smaller JAR, reduced memory.
• Hibernate Validation: full Bean Validation API compliance.
4. AOP: Aspect-Oriented Programming.
• Compile-time, reflection-free.
8 Copyright © 2022, Oracle and/or its affiliates

9. Micronaut features: HTTP Server
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10. Micronaut features: HTTP Client
10 Copyright © 2022, Oracle and/or its affiliates
Implemented at compile time

11. Micronaut features: message-driven applications
Kafka
• Producers.
• Consumers.
• Kafka Streams.
RabbitMQ
• Producers.
• Consumers.
• RPC.
MQTT
• Publishers.
• Subscribers.
NATS
• Producers.
• Consumers.
Copyright © 2022, Oracle and/or its affiliates
11

12. Micronaut features: data access
12 Copyright © 2022, Oracle and/or its affiliates

13. Micronaut features: data access
13 Copyright © 2022, Oracle and/or its affiliates
Interface implemented at compile time
Query generated from the
method name, compile-
time validated
Can have custom queries,
inserts, etc

14. Micronaut: Java App Dev with Oracle Database
14 Copyright © 2022, Oracle and/or its affiliates

15. Micronaut + Oracle DB: Supporting all Java DB Connectivity types
15 Copyright © 2022, Oracle and/or its affiliates

16. Micronaut features: security
1. Authentication providers.
• Bult-in support for LDAP and OAuth 2.0 password grant flow.
2. Security rules.
• Configuration or annotation-based.
3. Authorization strategies.
• Basic auth, session, JWT (JWKS, JWS), X.509.
4. OAuth 2.0.
• Authorization code, client credentials and password grants.
• OpenID Connect.
• Ease of integration with providers such as Okta, Auth0, AWS Cognito, Keycloak and more.
16 Copyright © 2022, Oracle and/or its affiliates

17. Micronaut features: misc
1. Distributed Tracing.
• Zipkin, Jaegger.
2. Service Discovery and Distributed
Configuration.
• Consul, Eureka, Kubernetes.
3. Monitoring.
• Micrometer, JMX, Elasticsearch.
4. API development.
• GraphQL, GRPC, Open API.
5. Containers.
• Docker, Kubernetes, Testcontainers.
6. Cache.
• Jcache, Redis, Ehcache, Hazelcast, Infinispan,
Oracle Coherence.
7. Email.
8. Error handling.
17 Copyright © 2022, Oracle and/or its affiliates

18. Getting Started: Micronaut Launch
18 Copyright © 2022, Oracle and/or its affiliates
https://launch.micronaut.io

19. Getting Started: Micronaut CLI
19 Copyright © 2022, Oracle and/or its affiliates

20. Getting started: Intellij IDEA
20 Copyright © 2022, Oracle and/or its affiliates

21. Getting started: Visual Studio Code
21 Copyright © 2022, Oracle and/or its affiliates

22. Micronaut 4
1. Java 17 required
• Virtual threads support (Project Loom).
• New HTTP Virtual threads support (Project Loom).
• @Client implementation based on java.net.http.HttpClient (JEP 321)
• For older versions of Java use Micronaut 3.x.
• Other languages
• Kotlin 1.8, KSP support.
• Apache Groovy 4.
2. Micronaut Data v4
• Hibernate 6.
22 Copyright © 2022, Oracle and/or its affiliates

23. Micronaut 4
3. Smaller, lighter runtime.
• Performance closer to raw Netty (~200ms startup).
• Some modules spun off core: Service Discovery, Retry, Session, Validation, Websocket.
• Some dependencies now optional: Jackson, SnakeYAML.
4. Other features:
• HTTP client/server filter methods: annotation-based and without reactive APIs.
• Annotation-based CORS configuration.
• HTTP/3 support.
• Use of GraalVM metadata repository.
• Prefer Micronaut Serialization over Jackson.
• Disabled cloud environment deduction by default.
23 Copyright © 2022, Oracle and/or its affiliates

24. Micronaut 4
5. Compile-time expression language
24 Copyright © 2022, Oracle and/or its affiliates
Checked at compile time
Checked at compile time

25. Micronaut 4
5. Compile-time expression language
25 Copyright © 2022, Oracle and/or its affiliates

26. Micronaut 4 Control Panel
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27. Copyright © 2022, Oracle and/or its affiliates
27
Graal Cloud Native (GCN)

28. What is Graal Cloud Native?
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28
BUILT FOR GRAALVM NATIVE IMAGE
Easily compile ahead-of-time with GraalVM Native Image into small
executables that start instantly, and use less memory/CPU.
CLOUD-AGNOSTIC MODULES
A curated set of Micronaut modules that provide platform-independent
support for core cloud services – object store, secrets, streaming, and more.
DEV TOOLS AND VS CODE EXTENSIONS
Dev tools to generate multicloud application starter templates. VS Code
extensions for local development and cloud deployment.

30. Copyright © 2022, Oracle and/or its affiliates
30

31. What is GraalVM
31 Copyright © 2022, Oracle and/or its affiliates

32. Native Image Goals
Low Resource
Usage
Start Fast
Compact
Packaging
Minimize
Vulnerability
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32

33. Micronaut
and
GraalVM
6ms
As low as
startup time
18MB
Consuming
memory footprint
>30%
Increased throughput up to
and reduced latency

34. Micronaut and GraalVM
1. The best integration possibly, supported by teams working together at Oracle Labs.
• GraalVM EE includes optimisations for Micronaut for increased performance and throughput.
• GraalVM EE license included in Oracle Cloud.
2. Micronaut is ready for GraalVM Native Image since day 1.
• No reflection, no runtime proxies, no bytecode generation, no dynamic classloading.
3. GraalVM Extenstion Pack for Visual Studio Code.
34 Copyright © 2022, Oracle and/or its affiliates

35. Micronaut is the fastest to startup
35 Copyright © 2022, Oracle and/or its affiliates | Confidential: Internal/Restricted/HighlyRestricted [Date]
Source: https://speakerdeck.com/mraible/comparing-native-java-rest-api-frameworks-jcon-2023

36. Micronaut is the fastest to startup
36 Copyright © 2022, Oracle and/or its affiliates | Confidential: Internal/Restricted/Highly Restricted [Date]
Source: https://speakerdeck.com/mraible/comparing-native-java-rest-api-frameworks-jcon-2023

37. Micronaut consumes the less memory
37 Copyright © 2022, Oracle and/or its affiliates | Confidential: Internal/Restricted/HighlyRestricted [Date]
Source: https://speakerdeck.com/mraible/comparing-native-java-rest-api-frameworks-jcon-2023

38. Micronaut and GraalVM powering Disney+
38 Copyright © 2022, Oracle and/or its affiliates
https://aws.amazon.com/blogs/opensource/improving-developer-productivity-at-disney-with-serverless-and-open-source/

39. Micronaut and GraalVM powering Disney+
39 Copyright © 2022, Oracle and/or its affiliates

40. Copyright © 2022, Oracle and/or its affiliates
40
Demo
Micronaut, Micronaut Data, GraalVM, Oracle DB

41. Copyright © 2022, Oracle and/or its affiliates
References
• Micronaut
• Guide - https://docs.micronaut.io/latest/guide/
• Config Reference - https://docs.micronaut.io/4.1.9/guide/configurationreference.html
• Javadocs - https://docs.micronaut.io/latest/api/
• Micronaut 4 - https://rb.gy/8236b
• GraalVM
• Overview - https://www.graalvm.org/latest/docs/introduction/
• Getting Started - https://www.graalvm.org/latest/docs/getting-started/
• Guides - https://www.graalvm.org/latest/guides/
• GraalVM for JDK 21 - https://medium.com/graalvm/graalvm-for-jdk-21-is-here-ee01177dd12d
• GCN - Graal Cloud Native
• GCN - Graal Cloud Native - https://www.graal.cloud/gcn/
• Graal Cloud Native Extensions Pack - https://rb.gy/ab105
• Micronaut Tools - Micronaut Tools - Visual Studio Marketplace
• Develop Java applications with Oracle Database
• JDBC, R2DBC, RSI - https://www.oracle.com/database/technologies/appdev/jdbc.html

42. Juarez Junior
@juarezjunior