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  String smallIcon = getOptionalString(preferences, resourceClass, propertyPrefix + SMALL_ICON, false);
    if (smallIcon != null) {
      putValue(SMALL_ICON, SwingTools.getScaledImageIcon(resourceClass.getResource(smallIcon)));
    }

    String toolBarIcon = getOptionalString(preferences, resourceClass, propertyPrefix + TOOL_BAR_ICON, false);
    if (toolBarIcon != null) {
      putValue(TOOL_BAR_ICON, SwingTools.getScaledImageIcon(resourceClass.getResource(toolBarIcon)));
    }