Interop

Composite Recipes

Recipes that include further recipes, often including the individual recipes below.

• Find Java-style call shapes inside Kotlin source
• Find Java↔Kotlin interop friction points
• Find Kotlin declarations missing @Jvm* interop annotations
• Find java.util.Collections / Arrays factory usage inside Kotlin
• Find java.util.Optional friction inside Kotlin
• Find java.util.stream.Stream friction inside Kotlin
• Find non-injected clock / I/O calls (testability)
• Find reactive-framework return types in Kotlin
• Improve Java↔Kotlin interop ergonomics

Recipes

• Apply Java↔Kotlin interop rewrites
• Find @RequiresOptIn annotation declarations
• Find Arrays.asList(...) calls
• Find Collections.emptyList/Set/Map() calls
• Find Collections.singletonList/Set/Map(...) calls
• Find Collections.unmodifiableList/Set/Map(...) wrappers
• Find CompletableFuture usage in Kotlin
• Find Java-style getX() calls in Kotlin source
• Find Java-style iterable.forEach(Consumer) calls
• Find LocalDateTime.now() / Instant.now() calls
• Find Optional.get() / orElseThrow() calls
• Find Optional.isPresent / isEmpty checks
• Find Optional.ofNullable(...) calls
• Find Optional.orElse(...) calls
• Find Reactor Mono/Flux returns in Kotlin
• Find Stream.of(...) calls
• Find System.currentTimeMillis() calls
• Find bufferedReader().lines() calls
• Find classes with manual equals/hashCode overrides — data class candidate
• Find companion object functions missing @JvmStatic
• Find const val / companion val declarations missing @JvmField
• Find function parameters typed Optional<T>
• Find functions returning CompletableFuture<T>
• Find functions returning Optional<T>
• Find functions returning java.util.stream.Stream<T>
• Find functions with default parameters missing @JvmOverloads
• Find functions with throw of a checked exception missing @Throws
• Find inner class Builder classes — default-args candidate
• Find interface declarations with default-method bodies
• Find io.reactivex.Observable/Flowable/Single/Maybe usage in Kotlin
• Find java.util.Optional usage in Kotlin
• Find manual getX() / setX(v) pairs in Kotlin classes
• Find object Constants \{ const val A = ... \} static-constants holders
• Find object Utils \{ fun foo() = ... \} static-utility holders
• Find requireNotNull(javaCall()) patterns
• Find stream.collect(Collectors.toList()) calls
• Find stream.filter(...).map(...) chains
• Find top-level functions missing @JvmName
• Find val isX Boolean properties missing @get:JvmName
• Use x instead of Optional.of(x).get()