StyleFactory sf = CommonFactoryFinder.getStyleFactory(null);
    FilterFactory2 ff = CommonFactoryFinder.getFilterFactory2(null);
    ContrastEnhancement ce = sf.contrastEnhancement(ff.literal(1.0), ContrastMethod.EXPONENTIAL);
    SelectedChannelType sct = sf.createSelectedChannelType(String.valueOf(1), ce);
    RasterSymbolizer sym = sf.getDefaultRasterSymbolizer();
    ChannelSelection sel = sf.channelSelection(sct);

    sym.setChannelSelection(sel);
    sym.setColorMap(cm.build());
    sym.setShadedRelief(new ShadedReliefBuilder().factor(22).brightnessOnly(true).build());

    Style style = SLD.wrapSymbolizers(sym);