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Drools Polyglot

A simple experiment with GraalVM capabilities.

  • JS sources are under src/main/js. Support files and data models are under src/main/java

Running the Examples

Plain Java

This example defines a rule using the canonical model Java API, and creates a session that fires that rule.

 mvn package -Prunjava

JavaScript

This example defines the same rule and creates a similar session to the Java example, but it does all of this using JS as the language.

Ensure that you have GraalVM in your $PATH, then:

 mvn package -Prunjs

The example will run Graal's node implementation with JVM interop enabled, and Drools on the classpath. You will notice the difference because the node engine will emit a diagnostic warning (we are using ES modules):

(node:20300) ExperimentalWarning: The ESM module loader is experimental.