Built a compact DI container for Java that avoids the pain points of Dagger 2’s compile-time graph generation and the overhead of Spring/Guice’s runtime reflection.
A key insight, suggested by Gemini and several other LLMs, is to use JDK 24’s Class-File API for zero-reflection classpath scanning, and then MethodHandles for fast object instantiation. The solution is JSR-330 compliant.
Migrated a real project (Dimension-UI) from Dagger 2 in 2 days. Key improvements:
– No bytecode generation or proxying magic
– Actual testability (isolated unit tests now work)
– 19KB footprint vs 10MB+ for Spring
– Startup is instant
Links
Dimension‑DI: https://github.com/akardapolov/dimension-di
Dimension‑UI: https://github.com/akardapolov/dimension-ui
DI Containers Comparison: https://github.com/Heapy/di-comparison
Comments URL: https://news.ycombinator.com/item?id=45821919
Points: 1
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Source: github.com
