Product Version: NetBeans IDE Dev (Build 201604280002)
Java: 1.8.0_60; Java HotSpot(TM) 64-Bit Server VM 25.60-b23
Runtime: Java(TM) SE Runtime Environment 1.8.0_60-b27
System: Windows 8.1 version 6.3 running on amd64; Cp1250; pl_PL (nb)

When I define an anonymous class I get errors in the editor. The code compiles and runs just fine.

Example:

int main(int argc, char** argv) {

    Engine engine;

    class : public LogCallback {

        virtual void sendLog(std::string log) {
            cerr << "err: " << log << endl;
        }
    } err;
    engine.setCallback(&err);
    engine.start();
    //

    return 0;
}