是否可以通过 Graal 从 JavaScript 调用 Kotlin？

Question

This works

var NodeTransformerClass = Java.type('com.fispan.crypto.api.java.NodeTransformer');
var nodeTransformer = new NodeTransformerClass();
var result = nodeTransformer.protect(customer, specification);

but this

var KotlinTransformerClass = Java.type('com.fispan.crypto.api.kotlin.NodeTransformer');
var kotlinTransformer = new KotlinTransformerClass();
var kotlinResult = kotlinTransformer.protect(customer, specification);

produces

unknown:0
unknown
^

[Error: kotlin/jvm/internal/Intrinsics]

Am I correct in assuming there is no way to call Kotlin directly from JavaScript/Node/js?

Also if you call Node.js -> Java -> Kotlin, you get the same message.

Am I correct in assuming there is no way to call into the JVM from Node.js if there is any Kotlin code in the call chain? Would this also be true of Scala or any other JVM language? 🤔

If so, this makes GraalVM completely unsuitable to our needs? 😥

See also https://github.com/oracle/graaljs/issues/484

Answer 1

Okay, finally figured this out... I did not have a complete JAR on my Graal Node classpath . Java was working because the Java runtime is automatically included, but the Kotlin runtime is not.

My solution was to use the Gradle shadow plugin to build a complete JAR. Once I did this, Node.js can call Java, and Java can call Kotlin.

See also fat-JAR and uber-JAR