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Java / GraalVM Interview questions

Describe the polyglot Context API?

org.graalvm.polyglot.Context is the main entry point for embedding and running guest languages from Java host code.

try (Context context = Context.create()) {
    Value result = context.eval("js", "1 + 2");
    System.out.println(result.asInt());
}

A Context represents an isolated execution environment for one or more guest languages - it controls what host classes the guest code can access, whether native access or I/O is permitted, and resource limits like max statements executed.

Values returned from guest code come back wrapped as Value objects, which provide type-safe conversion methods (asInt(), asString(), as(MyInterface.class)) so Java code doesn't need to know the guest language's native representation directly.

Which class is the main entry point for running guest language code from Java?
What does a Context control?

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