Webview shouldOverrideUrlLoading works in previous android versions except 4.1.x jellybean

the following code works fine in all devices running android 2.x , but not in a Nexus 7 tablet with 4.1.2

The problem is that the shouldOverrideUrlLoading never run. The onPageFinished run ok

I'll appreciate any available help.

wv = (WebView) root_view.findViewById(R.id.wv);
wv.setBackgroundColor(res.getColor(R.color.def_bgr_color));
wv.setScrollBarStyle(View.SCROLLBARS_OUTSIDE_OVERLAY);
wv.setWebViewClient(new MyWebViewClient() );

WebSettings web_settings = wv.getSettings();
web_settings.setJavaScriptEnabled(true);
web_settings.setLoadWithOverviewMode(true);
web_settings.setUseWideViewPort(false);
web_settings.setPluginsEnabled(true);
web_settings.setSupportZoom(true);
web_settings.setLayoutAlgorithm(LayoutAlgorithm.SINGLE_COLUMN);

public class MyWebViewClient extends WebViewClient {
    public MyWebViewClient() {
    }

    @Override
    public boolean shouldOverrideUrlLoading(WebView view, String url) {
        Log.i(TAG, "RUN shouldOverrideUrlLoading" );
        return true;

    }

    @Override
    public void onPageFinished(WebView view, String url) {
        super.onPageFinished(view, url);
        Log.i(TAG, "RUN onPageFinished" );
    }
}


String html_str = ... something html ...

wv.loadDataWithBaseURL("file:///android_asset/", html_str, "text/html", "utf-8", null);