add JavaDoc and Exception error message

Author: ddamke

src/main/java/de/doubleslash/keeptime/common/SvgNodeProvider.java

@@ -13,27 +13,31 @@
 import java.io.IOException;
 import java.io.InputStream;
 
+/**
+ * class loads SvgPath from a SvgFile because Java can not load the original svg file as it is. <p>
+ * To load the svg the class extracts the path as string and creates a new SvgPath and returns it.
+ */
+
 public class SvgNodeProvider {
 
     private static String getSvgPathWithXMl(Resources.RESOURCE resource) {
         String svgPath;
         Document document;
         DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
-        DocumentBuilder db = null;
-
+        DocumentBuilder db;
 
         try {
             db = dbf.newDocumentBuilder();
         } catch (ParserConfigurationException e) {
-            throw new RuntimeException(e);
+            throw new RuntimeException(e + "Tried to build new document");
         }
 
         try (InputStream inputStream = Resources.getResource(resource).openStream()) {
             document = db.parse(inputStream);
             NodeList nodeList = document.getElementsByTagName("path");
             svgPath = nodeList.item(0).getAttributes().getNamedItem("d").getNodeValue();
         } catch (IOException | SAXException e) {
-            throw new RuntimeException(e);
+            throw new RuntimeException(e + " ");
         }
         return svgPath;
     }