[Geotools-gt2-users] Label rendered with empty features using geotools

[maven apache]

This is a question I have posted at stackchange​(
http://gis.stackexchange.com/questions/159551/label-rendered-with-empty-features-using-geotools),however
it did not own much attention, so I tried to post it here. And I will
update the origin post once it is solved here.

Origin post:
I am using geotools to generate some images based on the shapefile data, it
works well until I tried to add labels for the line features: the labels
are rendered even there are no features in the images.
Check http://i.stack.imgur.com/MVVAe.png, and
http://i.stack.imgur.com/hNtKi.png
As shown, the result is not what I expected, the labels are rendered
without attached with the feature.

This is the core rendering codes:
public BufferedImage render(ShapefileDataStore dataStore, int x, int y, int
zoom, int width, int height) {
    double[] box = new double[]{.....};
    ReferencedEnvelope bbox = new ReferencedEnvelope(box[0], box[2],
box[1], box[3], crs);
    BufferedImage image = new BufferedImage(rwidth, rheight,
BufferedImage.TYPE_INT_ARGB);
    Graphics2D g = image.createGraphics();
    g.setComposite(AlphaComposite.Clear);
    g.fillRect(0, 0, rwidth, rheight);
    g.setComposite(AlphaComposite.Src);
    MapContent mapContent = new MapContent();
    try {
        String schemaName = dataStore.getSchema().getName().toString();
        Style style=createStyle();
        mapContent.addLayer(new FeatureLayer(dataStore.getFeatureSource(),
style));
        synchronized (renderer) {
            renderer.setMapContent(mapContent);
            renderer.paint(g, imageSize, bbox);
        }
    } catch (Exception e) {
    } finally {
        mapContent.dispose();
        g.dispose();
    }
    return image;
}
public Style createStyle(){
    SLDParser sldParser = new SLDParser(styleFactory, new
File("style.sld").toURL());   Style[] ss = sldParser.readXML();  return
ss[0];
}

And the style.sld:
<StyledLayerDescriptor version="1.0.0">
...
            <FeatureTypeStyle>
                <Rule>
                    <Name>Single symbol</Name>
                    <LineSymbolizer>
                        <Stroke>
                            <CssParameter
name="stroke">#ffffff</CssParameter>
                            <CssParameter
name="stroke-width">10</CssParameter>
....
                        </Stroke>
                    </LineSymbolizer>
                    <TextSymbolizer>
                        <Label>
                            <ogc:PropertyName>name</ogc:PropertyName>
                        </Label>
                        <Font>
                            <CssParameter
name="font-family">Arial</CssParameter>
                            <CssParameter name="font-size">18</CssParameter>
                        </Font>
                        <Fill>
                            <CssParameter name="fill">#a4bdc5</CssParameter>
                        </Fill>
                        <VendorOption name="followLine">true</VendorOption>
                    </TextSymbolizer>
                </Rule>
            </FeatureTypeStyle>
...
</StyledLayerDescriptor>
Did I miss anything?

Thanks.

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