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Formatting an XML file using Transformer

import java.io.File; import java.io.FileInputStream; import java.io.InputStreamReader; import javax.xml.parsers.DocumentBuilder; import javax.xml.parsers.DocumentBuilderFactory; import javax.xml.transform.OutputKeys; import javax.xml.transform.Result; import javax.xml.transform.Source; import javax.xml.transform.Transformer; import javax.xml.transform.TransformerFactory; import javax.xml.transform.dom.DOMSource; import javax.xml.transform.stream.StreamResult; import org.w3c.dom.Document; import org.xml.sax.InputSource; public class Main {   public static void main(String[] argv) throws Exception {   }   static void formatXMLFile(String file) throws Exception{     DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();     DocumentBuilder builder = factory.newDocumentBuilder();     Document document = builder.parse(new InputSource(new InputStreamReader(new FileInputStream(         file))));     Transformer xformer = TransformerFactory.newInstance().newTransformer();     xformer.setOutputProperty(OutputKeys.METHOD, "xml");     xformer.setOutputProperty(OutputKeys.INDENT, "yes");     xformer.setOutputProperty("b;http://xml.apache.org/xsltd;indent-amount", "4");     xformer.setOutputProperty(OutputKeys.OMIT_XML_DECLARATION, "yes");     Source source = new DOMSource(document);     Result result = new StreamResult(new File(file));     xformer.transform(source, result);   } }