Kotlin Script Execution Not Working in OSGI Environment

Libraries
1

Hi,

I’m working on integrating Kotlin scripting support into an OSGi environment. The project is Maven-based, and I’ve included all the necessary dependencies for .kts script execution. Currently, I’m using a shaded (fat) JAR to package everything, though ideally I’d prefer a more modular or lightweight setup if available.

Here’s the current list of dependencies:

<!-- Kotlin dependencies for .kts execution -->
<dependency>
  <groupId>org.jetbrains.kotlin</groupId>
  <artifactId>kotlin-osgi-bundle</artifactId>
  <version>${kotlin.version}</version>
</dependency>
<dependency>
  <groupId>org.jetbrains.kotlin</groupId>
  <artifactId>kotlin-script-runtime</artifactId>
  <version>${kotlin.version}</version>
</dependency>
<dependency>
  <groupId>org.jetbrains.kotlin</groupId>
  <artifactId>kotlin-scripting-common</artifactId>
  <version>${kotlin.version}</version>
</dependency>
<dependency>
  <groupId>org.jetbrains.kotlin</groupId>
  <artifactId>kotlin-scripting-jvm</artifactId>
  <version>${kotlin.version}</version>
</dependency>
<dependency>
  <groupId>org.jetbrains.kotlin</groupId>
  <artifactId>kotlin-scripting-jvm-host</artifactId>
  <version>${kotlin.version}</version>
</dependency>
<dependency>
  <groupId>org.jetbrains.kotlin</groupId>
  <artifactId>kotlin-compiler-embeddable</artifactId>
  <version>${kotlin.version}</version>
</dependency>
<dependency>
  <groupId>org.jetbrains.kotlin</groupId>
  <artifactId>kotlin-scripting-compiler-embeddable</artifactId>
  <version>${kotlin.version}</version>
</dependency>
<dependency>
  <groupId>org.jetbrains.kotlin</groupId>
  <artifactId>kotlin-scripting-jsr223</artifactId>
  <version>${kotlin.version}</version>
</dependency>

To execute scripts, I’m using the following logic to initialize the Kotlin script engine:

ClassLoader originalClassLoader = Thread.currentThread().getContextClassLoader();
try {
    Thread.currentThread().setContextClassLoader(this.getClass().getClassLoader());
    ScriptEngineManager manager = new ScriptEngineManager();
    this.kotlinEngine = manager.getEngineByName("kotlin");

    if (this.kotlinEngine != null) {
        LOG.info("OK: Kotlin ScriptingHost activated successfully using standard ScriptEngineManager.");
    } else {
        LOG.error("CRITICAL: Kotlin script engine not found. The embeddable dependency may be missing.");
    }
} catch (Throwable t) {
    LOG.error("CRITICAL: A fatal error occurred during ScriptingHost activation.", t);
} finally {
    Thread.currentThread().setContextClassLoader(originalClassLoader);
}

However, when executing a Kotlin script

this.engine.eval(this.scriptText, context);

, I get the following error:

javax.script.ScriptException: ERROR Unable to initialize repl compiler:

DEBUG Using JDK home inferred from java.home: /Library/Java/JavaVirtualMachines/jdk-11.jdk/Contents/Home

ERROR Unable to find kotlin stdlib, please specify it explicitly via “kotlin.java.stdlib.jar” property: java.lang.Exception: Unable to find kotlin stdlib, please specify it explicitly via “kotlin.java.stdlib.jar” property: java.lang.IllegalStateException: Unable to initialize repl compiler:

…

This is confusing, as the kotlin-stdlib is already included and correctly listed in the bundle’s classpath. The runtime shouldn’t need to be told explicitly where the kotlin-stdlib.jar is located if it’s already part of the embedded bundle.

Any guidance on how to address this? Specifically:

  • Is there a way to declaratively satisfy the kotlin.java.stdlib.jar requirement within an OSGi bundle?
  • Is this a classloader visibility issue inside the scripting engine?
  • Are there lighter alternatives to bundling the full compiler?

Thanks in advance for your help!