Plug-in Architectures With Layrry and the Java Module System

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Plug-in Architectures With Layrry and the Java Module System Gunnar Morling @gunnarmorling

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

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What no one ever said “Let’s use JPMS Layers to tackle (some of) these issues”

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Module Layers https://docs.oracle.com/en/java/javase/14/docs/api/java.base/java/lang/ModuleLayer.html

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Using the Layers API

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Hello, Layrry! An API and Launcher for Modularized Java Applications

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Hello, Layrry!

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Layrry JPMS © Christoper Michel https://flic.kr/p/UMtHv5 (CC BY 2.0)

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Ready-Made Launcher

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Plug-in Architectures Can dynamically add (and remove) layers at runtime

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Demo

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Resources Source code https://github.com/moditect/layrry 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/