Launching the Micro Future: Micronaut with GraalVM in Practice @ JUG.CH Berne 2019

Micronaut is a modern, JVM-based full-stack framework for building modular, easily testable microservice and serverless applications. Developed by the creators of the Grails framework and with the support of many Spring developers, who have used their experience in these areas to develop a framework specifically focused on microservices.

Oracle’s newly developed GraalVM will change our view of microservices and cloud capabilities in the Java ecosystem and enable us to compete with native compilations. When Micronaut and GraalVM come together, both architectures can take full advantage of each other, resulting in amazingly efficient applications.

This workshop is an introduction to development with Micronaut on the GraalVM to give you everything you need to get started right away. The following topics will be covered in the workshop:

- Project creation with Micronaut-CLI
- Non-blocking, reactive HTTP Clients and Servers
- Scheduled Task Execution
- Configuration using files and environment variables
- Unit-Tests with and without a server
- Dependency Injection (at compile time)
- Robust interfaces (Retries, Circuit Breakers, Fallback)
- GraalVM Native Image
- Build using Docker without local GraalVM installation

Transcript

1. Launching the Micro Future
   Micronaut with GraalVM in Practice
   Marcus Fihlon
   @McPringle
   December 3, 2019
   Berne
   

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2. @McPringle
   Disclaimer
   The following presentation has been approved for open audiences only. Hypersensitivity to occasional
   profanity requires covering ears.
   All logos, photos etc. used in this presentation are the property of their respective copyright owners and
   are used here for educational purposes only. Any and all marks used throughout this presentation are
   trademarks of their respective owners.
   The presenter is not acting on behalf of CSS Insurance, neither as an official agent nor representative. The
   views expressed are those solely of the presenter.
   Marcus Fihlon disclaims all responsibility for any loss or damage which any person may suffer from reliance
   on this information or any opinion, conclusion or recommendation in this presentation whether the loss or
   damage is caused by any fault or negligence on the part of presenter or otherwise.
   

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3. @McPringle
   About me
   ● Scrum Master and Code Warrior
   ● International Speaker and Community Leader
   ● Lecturer and Author
   ● Java and Kotlin Fan
   ● A German living in Switzerland
   ● Cycling Junkie
   

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4. Intro
   

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5. @McPringle
   Graeme Rocher
   

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6. @McPringle
   Main Focus
   Micronaut focuses on the following aspects of applications for the JVM and tries
   to optimize them:
   ● Fast application start-up
   ● Reduced runtime memory footprint
   ● Minimal use of Java Reflection
   ● Minimal use of Java proxies
   ● Simple, fast application tests
   

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7. @McPringle
   Introduction to Micronaut
   The lecture of Graeme Rocher yesterday at 5 pm in the Apollo room was recorded
   and will be available on YouTube (hopefully) soon.
   I don't want to repeat this and therefore concentrate on the practical side with
   some examples.
   

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8. Live Coding
   

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9. Workshop Time!
   

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10. @McPringle
    github.com/McPringle/micronaut-workshop
    

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11. @McPringle
    Cross your fingers and you might see:
    ● Project creation
    ● Configuration
    ● Reactive HTTP Clients
    ● Non-blocking HTTP Servers
    ● Scheduled Task Execution
    ● Component Testing
    ● Dependency Injection
    ● Retries, Circuit Breakers, Fallback
    ● GraalVM Native Image
    ● Building and Running using Docker
    

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12. @McPringle
    Notes
    All notes of the live coding are available online:
    https://docs.google.com/document/d/19RPIdQKkOfEqojQRg-VjJMRIBbiIua1oP7_QqIKiQVM
    GitHub Repo with file listing demo:
    https://github.com/McPringle/jbcnconf-2019-listfiles
    GitHub Repo with beer demo:
    https://github.com/McPringle/jbcnconf-2019-beers
    

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13. One more thing…
    

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14. @McPringle
    You ever dreamed of living in Lucerne?
    

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15. @McPringle
    Code Warriors wanted!
    About you
    ● You are frighteningly awesome at what you do.
    ● You can perform quick and deadly tactical
    strikes, as well as feats of epic badassery.
    Sometimes both at the same time.
    ● You would rather refactor existing, mostly
    working, ugly code instead of rewriting it from
    scratch. OK nobody would really rather do that,
    but you know it's the right and honorable thing
    to do most of the time.
    ● You know where your towel is.
    About us
    ● Biggest Basic Health Insurance Company
    ● 2800 Employees
    ● 300 IT Professionals
    ● 24 Scrum Teams
    ● 130 Software Developers (and hiring)
    ● Flexible working times
    ● Personal development support
    ● 6 weeks paid vacation
    ● Great benefits
    ● Located in Lucerne, Switzerland
    Contact me: marcus.fihlon@css.ch
    

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16. @McPringle
    github.com/McPringle/micronaut-workshop
    Fat Man Cycling
    https://fatmancycling.tours
    

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