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

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

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

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

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

Introduction to Micronaut
Copyright © 2022, Oracle and/or its affiliates
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.

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
6

7
Any language, build tool, test framework, reactive library, cloud, …

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.

Micronaut features: HTTP Server

Micronaut features: HTTP Client
Implemented at compile time

Micronaut features: message-driven applications
Kafka
• Producers.
• Consumers.
• Kafka Streams.
RabbitMQ
• Producers.
• Consumers.
• RPC.
MQTT
• Publishers.
• Subscribers.
NATS
• Producers.
• Consumers.
11

Micronaut features: data access

Micronaut features: data access
Interface implemented at compile time
Query generated from the
method name, compile-
time validated
Can have custom queries,
inserts, etc

Micronaut: Java App Dev with Oracle Database

Micronaut + Oracle DB: Supporting all Java DB Connectivity types

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.

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.

Getting Started: Micronaut Launch
https://launch.micronaut.io

Getting Started: Micronaut CLI

Getting started: Intellij IDEA

Getting started: Visual Studio Code

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.

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.

Micronaut 4
5. Compile-time expression language
Checked at compile time
Checked at compile time

Micronaut 4
5. Compile-time expression language

Micronaut 4 Control Panel

27
Graal Cloud Native (GCN)

What is Graal Cloud Native?
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.

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

30

What is GraalVM

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

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

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.

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

Micronaut and GraalVM powering Disney+
https://aws.amazon.com/blogs/opensource/improving-developer-productivity-at-disney-with-serverless-and-open-source/

Micronaut and GraalVM powering Disney+

40
Demo
Micronaut, Micronaut Data, GraalVM, Oracle DB

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

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

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