[Geotools-gt2-users] Create sld dinamically

[peppe <ca...@gm...>]

Hi list, 
I'm trying to make themes by Geotools on a map service wms (Geoserver). 
I'm using the sld. 
I added SLD=http://localhost:8080/webGeoTools/sld.xml at the call wms and
it's work fine
but now, I would like to create the file sld in my code java and then pass
it as string to wms by: SLD_BODY = "_________________" 

with Geotools how can I create this? 

my sld file is: 
<StyledLayerDescriptor version="1.0.0">
	<NamedLayer>
		<Name>test:Province</Name>
		<UserStyle>
			<Title>title sld</Title>
			<FeatureTypeStyle>
				<Rule>
					<Filter>
						<PropertyIsEqualTo>
						<PropertyName>NOME_PRO</PropertyName>
						<Literal>MILANO</Literal>
						</PropertyIsEqualTo>
					</Filter>
					<PolygonSymbolizer>
						<Geometry>
							<PropertyName>the_geom</PropertyName>
						</Geometry>
						<Fill>
							<CssParameter name="fill">#ff0000</CssParameter>
						</Fill>
					</PolygonSymbolizer>
				</Rule>
			</FeatureTypeStyle>
		</UserStyle>
	</NamedLayer>
</StyledLayerDescriptor>


I tried writing this code to get the same file, but I am missing something
.... 
  private String buldSLD() {
    String styleAsXml="";
    StyledLayerDescriptor sld = new StyledLayerDescriptorImpl();
    NamedLayer nameLayer = new NamedLayerImpl();
    nameLayer.setName("test:Province");
    StyleBuilder builder = new StyleBuilder();
    Style style = builder.createStyle();
    style.setName("MyStyle");
    try {

      FilterFactoryImpl factory = new FilterFactoryImpl();
      Expression exp1 = builder.attributeExpression("NOME_PRO");
      Expression exp2 = builder.attributeExpression("MILANO");
      PropertyIsEqualTo eq = factory.equal(exp1, exp2, true);
      
      PolygonSymbolizerImpl pol =
(PolygonSymbolizerImpl)builder.createPolygonSymbolizer(Color.yellow,
Color.gray, 2);
      pol.setGeometryPropertyName("the_geom");
      Rule rule =builder.createRule(pol);
      rule.setFilter(eq);
      FeatureTypeStyle st = builder.createFeatureTypeStyle("uno", rule);
      FeatureTypeStyle[] fts = new FeatureTypeStyle[1];
      fts[0] = st;
      style.addFeatureTypeStyle(st);
      
      SLDUserStyleBinding user = new
SLDUserStyleBinding(builder.getStyleFactory());
      nameLayer.addStyle(style);
      
      SLDTransformer transform = new SLDTransformer();
      styleAsXml = transform.transform(style);
      System.out.println(styleAsXml);
      styleAsXml = URLEncoder.encode(styleAsXml);
      System.out.println(styleAsXml);
    } catch(TransformerException e) {
      e.printStackTrace();
    }
    return styleAsXml;
  }

then i pass this string with SLD_BODY=
but wms return an error:
<?xml version="1.0" encoding="UTF-8" standalone="no"?><!DOCTYPE
ServiceExceptionReport SYSTEM
"http://schemas.opengis.net/wms/1.1.1/WMS_exception_1_1_1.dtd">
<ServiceExceptionReport version="1.1.1" >   <ServiceException>
	java.lang.NullPointerException
	null
</ServiceException></ServiceExceptionReport>

help me! 
thanks
Peppe
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