// Compiled on JDK 1.6
public class CComboUtils {
    public static void disableMouseWheel(final CCombo combo) {
        // Executed both on test (jdk 1.6) and integration (jre 1.8)
        combo.addListener(SWT.MouseWheel, new Listener() {
            public void handleEvent(Event event) {
                // Executed on test. NOT executed on integration
                System.out.println("CComboUtils.disableMouseWheel::handleEvent");
                if (event.count > 0) {
                    System.out.println("CComboUtils.disableMouseWheel::handleEvent::handleScrollUp");
                    handleScrollUp(combo, event);
                } else if (event.count < 0) {
                // Executed on test. NOT executed on integration    System.out.println("CComboUtils.disableMouseWheel::handleEvent::handleScrollDown");
                    handleScrollDown(combo, event);
                }
            }
        }); 
    }
    
    public static void handleScrollUp(CCombo combo, Event event) {
        if (combo.isFocusControl()) {
            // could be a legitimate key event, let CCombo handle it
            return;
        }
        
        event.doit = false;
    }

    public static void handleScrollDown(CCombo combo, Event event) {
        if (combo.isFocusControl()) {
            // could be a legitimate key event, let CCombo handle it
            return;
        }
        
        event.doit = false;
    }
}