oracle/graal · error · IllegalStateException

Unexpected JNI scope: <topScope.get()>

Error message

Unexpected JNI scope: <topScope.get()>

What it means

Error "Unexpected JNI scope: <topScope.get()>" thrown in oracle/graal.

Source

Thrown at sdk/src/org.graalvm.jniutils/src/org/graalvm/jniutils/JNIMethodScope.java:154

     */
    private JObject objResult;

    public void setObjectResult(JObject obj) {
        objResult = obj;
    }

    @SuppressWarnings("unchecked")
    public <R extends JObject> R getObjectResult() {
        return (R) objResult;
    }

    @Override
    public void close() {
        JNIUtil.trace(1, "HS->%s[ exit]: %s", getFeatureName(), scopeName);
        HSObject.invalidate(locals);
        if (parent == null) {
            if (topScope.get() != this) {
                throw new IllegalStateException("Unexpected JNI scope: " + topScope.get());
            }
            topScope.set(null);
        } else {
            JNIMethodScope top = parent;
            while (top.parent != null) {
                top = top.parent;
            }
            top.leaf = parent;
        }
    }

    public final int depth() {
        int depth = 0;
        JNIMethodScope ancestor = parent;
        while (ancestor != null) {
            depth++;
            ancestor = ancestor.parent;
        }

View on GitHub (pinned to a66e9ccd1d)

Solutions

1. Fix the condition reported by the error: Unexpected JNI scope: <topScope.get()>
2. Check the throwing call site and ensure its documented preconditions (argument values, types, environment, or configuration) are satisfied before the call.

Example fix

Validate inputs and environment so that the failing condition does not occur: Unexpected JNI scope: <topScope.get()>

When it happens

Trigger: Thrown at sdk/src/org.graalvm.jniutils/src/org/graalvm/jniutils/JNIMethodScope.java:154 when the library encounters an invalid state.

Common situations: Occurs when a caller violates the contract guarded by this check: Unexpected JNI scope: <topScope.get()>

AI-assisted analysis of oracle/graal@a66e9ccd1d (2026-08-14). Data as JSON: /api/errors/ac69ffbef15e5055. Report an issue: GitHub.