This webinar by Taras Boychuk (Founder of Bobocode) was delivered at Java Community Webinar #7 on March 3, 2021. Jet programming in Java is already quite advanced and popular. The main tools for building jet web-applications are Reactor Netty, or Vert.x. However, they have not previously used ORM to access data. Reactive application requires a reactive (non-blocking) stack, and all ORMs were blocking. Were until recently… During this report, we discussed how the first Hibernate Reactive ORM framework works. More details and video: https://www.globallogic.com/ua/about/events/java-community-webinar-7/ Join our community: https://www.facebook.com/groups/GLJavaCommunity/

1. 1
TARAS BOYCHUK
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2. Agenda
• what I’m working on now 👨💻
• problems with Hibernate ORM ☹
• solutions using reactive programming 🧐
• live coding with Hibernate Reactive 💻
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3. 3
🙋
Taras Boychuk
👨💻
👨🏫
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4. Open Source Education for Java Developers
4
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5. 5
Persistence
Context
Lazy Loading
Dirty Checking
Cascade
Operations
Orphan
Removal
Action Queue
Flush
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6. 6
https://peoplepill.com/people/martin-fowler
OrmHate?
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7. 7
https://martinfowler.com/bliki/OrmHate.html
OrmHate. Martin Fowler
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8. 8
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IN REAL APPS

9. Server
JVM
Tomcat
9
Controllers
Service
…
Spring Data JPA
Hibernate ORM
JDBC Driver
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HikariCP
…
Blocking I/O
…

10. https://www.reactivemanifesto.org/
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11. 11
Reactor Netty Eclipse Vert.x
* based on Asynchronous Sockets
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No ORM

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THE FIRST REACTIVE ORM? 🤔
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13. 13
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Reactive Postgres Client
Non-Blocking
I/O
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14. Before you start ❗
• Understand the idea of reactive programming ✅
• Understand functional programming features ✅
• Understand CompletableFuture ✅
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15. 15
Live Coding Session 👨💻
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16. 16
https://peoplepill.com/people/martin-fowler
ReactiveOrm..?
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17. Summary
• The
fi
rst “reactive” ORM 👏
• It’s only Beta4 ⚠
• Hibernate complexity + reactive programming complexity 🤯
• Built on top of Vert.x Reactive Client ✔
• Already supported by Quarkus ✔
• Not supported by Spring Data ⛔
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18. 18
See you