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@gunnarmorling | @aalmiray #Layrry Plug-in Architectures With Layrry and the Java Module System Gunnar Morling | Andres Almiray

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@gunnarmorling | @aalmiray #Layrry Gunnar Morling ● Open source software engineer at Red Hat ○ Debezium ○ Hibernate ● Spec Lead for Bean Validation 2.0 ● Java Champion ● @gunnarmorling

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@gunnarmorling | @aalmiray #Layrry Andres Almiray ● Senior Principal Product Manager @ Oracle ○ “Seasoned Sourceror” ● ❤ Open Source & Java ● Apache Groovy PMC ● Java Champion Alumni ● @aalmiray

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@gunnarmorling | @aalmiray #Layrry JPMS Java Platform Module System (also known as Jigsaw) Introduced in Java 9 Designed to break down the JVM monolith Applicable to user space as well The promise is to give developers better code encapsulation and design foundations

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@gunnarmorling | @aalmiray #Layrry However... © Alexander Henning Drachmann https://flic.kr/p/uUA4G (CC BY-SA 2.0)

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@gunnarmorling | @aalmiray #Layrry Some User Statements “JPMS only allows for one version of a module” “JPMS doesn’t allow to add modules at runtime” “I have to modularize ALL my dependencies in order to benefit from JPMS” “It’s so hard to map dependency coordinates to module dependencies” “Help, non-exported packages of different modules collide!”

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@gunnarmorling | @aalmiray #Layrry What no one ever said “Let’s use JPMS Layers to tackle (some of) these issues”

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@gunnarmorling | @aalmiray #Layrry Module Layers https://docs.oracle.com/en/java/javase/14/docs/api/java.base/java/lang/ModuleLayer.html

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@gunnarmorling | @aalmiray #Layrry Using the Layers API

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@gunnarmorling | @aalmiray #Layrry Hello, Layrry! An API and Launcher for Modularized Java Applications

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@gunnarmorling | @aalmiray #Layrry Hello, Layrry!

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@gunnarmorling | @aalmiray #Layrry Layrry JPMS © Christoper Michel https://flic.kr/p/UMtHv5 (CC BY 2.0)

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@gunnarmorling | @aalmiray #Layrry Ready-Made Launcher layrry-launcher--all.jar \ —layers-config layers.yml

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@gunnarmorling | @aalmiray #Layrry Parameterization

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@gunnarmorling | @aalmiray #Layrry Built-in Template Support layrry-launcher--all.jar \ —layers-config javafx.toml \ —properties versions.properties

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@gunnarmorling | @aalmiray #Layrry jbang layrry@moditect \ —layers-config javafx.toml \ —properties versions.properties

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@gunnarmorling | @aalmiray #Layrry Local Repositories © Andres Almiray (CC BY 2.0)

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@gunnarmorling | @aalmiray #Layrry Local Repositories ● Artifacts can be organized in a local repository that does not require remote resolution ● Two layouts currently supported

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@gunnarmorling | @aalmiray #Layrry Local Repositories

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@gunnarmorling | @aalmiray #Layrry Local Repositories

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@gunnarmorling | @aalmiray #Layrry Plug-in Architectures © Justin Taylor https://flic.kr/p/4fQz9t (CC BY 2.0)

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@gunnarmorling | @aalmiray #Layrry Plug-in Architectures Can dynamically add (and remove) layers at runtime

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@gunnarmorling | @aalmiray #Layrry Plug-in Architectures

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@gunnarmorling | @aalmiray #Layrry © Bob Adams https://flic.kr/p/cYV7gq (CC BY-SA 2.0) Demo

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@gunnarmorling | @aalmiray #Layrry Bonus: Class Unloading ● Classes and layer class loader subject to GC after plug-in removal ● Dragons beware, class loader leaks can happen ○ Dangling references in remaining layers ○ Started threads ○ Shutdown hooks

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@gunnarmorling | @aalmiray #Layrry

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@gunnarmorling | @aalmiray #Layrry

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@gunnarmorling | @aalmiray #Layrry

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@gunnarmorling | @aalmiray #Layrry

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@gunnarmorling | @aalmiray #Layrry Outlook ● Remote layer files ● Binary distributions: Github Releases, Homebrew, SDKMan, etc. ● Integration with jlink ● Derive layers from pom.xml? ● Programmatic plug-in API ● Your contributions?!

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@gunnarmorling | @aalmiray #Layrry Resources Source code https://github.com/moditect/layrry https://github.com/moditect/layrry-examples

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@gunnarmorling | @aalmiray #Layrry Resources Blog posts https://www.morling.dev/blog/introducing-layrry-runner-and-api-for- modularized-java-applications/ https://www.morling.dev/blog/plugin-architectures-with-layrry-and- the-java-module-system/ https://www.morling.dev/blog/class-unloading-in-layered-java-applications/

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@gunnarmorling | @aalmiray #Layrry Q & A

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@gunnarmorling | @aalmiray #Layrry Demo

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@gunnarmorling | @aalmiray #Layrry JavaFX Demo