Adding JNIEXPORT function kills Android service under debugger

I'm trying to call c++ function from Java.

For this I added some function like this:

extern "C" JNIEXPORT void JNICALL Java_org_test_app_MyActivity_onTest(
        JNIEnv *env,
        jobject obj,
        jstring url)
{
    Q_ASSERT(env);
    QString myurl = QString::fromUtf8(
                env->GetStringUTFChars(url, nullptr));
    qDebug() << "got url: " << myurl;
}

Now, when I start my app under the debugger, activity part starts OK but service part starts and terminates a bit later (my activity starts the service).

If I launch app without debugger - all works fine and c++ method is called (I see the debug output in the log).

I've tried removing all from Java code related to calling this c++ function - did not help. If I remove this function from c++ - starts to work under debugger.