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kotlin-tooling-java-to-kotlin

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Use when converting Java source files to idiomatic Kotlin, when user mentions "java to kotlin", "j2k", "convert java", "migrate java to kotlin", or when working with .java files that need to become .kt files. Handles framework-aware conversion for Spring, Lombok, Hibernate, Jackson, Micronaut, Quarkus, Dagger/Hilt, RxJava, JUnit, Guice, Retrofit, and Mockito.

skills/kotlin-tooling-java-to-kotlin/SKILL.md

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Nov 10, 2026

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Repository last updated
Oct 30, 2026
License
Apache-2.0

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# Java to Kotlin Conversion

Convert Java source files to idiomatic Kotlin using a disciplined 4-step conversion
methodology with 5 invariants checked at each step. Supports framework-aware conversion
that handles annotation site targets, library idioms, and API preservation.

## Workflow

```dot
digraph j2k_workflow {
  rankdir=TB;
  "User specifies files" -> "Step 0: Scan & Detect";
  "Step 0: Scan & Detect" -> "Load framework guides";
  "Load framework guides" -> "Step 1: Convert";
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