Kotlin-Java Interop

This is a minimal project that demonstrates Kotlin/Java interop in the Cursor IDE.

Project Structure

• Kotlin 2.0
• Java 21
• Maven
• A Calculator.kt that is meant to be called from Java main defined in JavaMain.java and a Kotlin main defined in KotlinMain.kt

In the Terminal

This command shows that you can call Kotlin from Java at runtime without issues ...

mvn clean compile exec:java -Dexec.mainClass=com.example.JavaMain

This command shows that you can call Kotlin from Kotlin at runtime without issues ...

mvn clean compile exec:java -Dexec.mainClass=com.example.KotlinMainKt

The Problem

Open JavaMain.java, in the Problems tab you will see The import com.example.Calculator cannot be resolved. I have tried the following extension combinations. All exhibit the same behavior ...

• Java + Kotlin(daplf)
• Kotlin(fwcd) and Java w/ Language Support for Java
• Kotlin Language(mathiasfrohlich) and Java w/ Language Support for Java