evaluate XPath Expression from XML file

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.transform.OutputKeys;
import javax.xml.transform.Result;
import javax.xml.transform.Source;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.TransformerFactoryConfigurationError;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import javax.xml.xpath.XPath;
import javax.xml.xpath.XPathConstants;
import javax.xml.xpath.XPathExpressionException;
import javax.xml.xpath.XPathFactory;

import org.w3c.dom.Document;
import org.w3c.dom.Node;
import org.xml.sax.SAXException;
 

 
public class XPathUtility {

    
    private XPathUtility() {

    }

 
    public static String evaluateNode(String expression, InputStream xmlFile) {
	Object[] params = { expression, xmlFile };
	 
	
	Node result = null;

	DocumentBuilder parser = null;
	try {
	    parser = DocumentBuilderFactory.newInstance().newDocumentBuilder();
	} catch (ParserConfigurationException parserConfigurationException) {
	   // Do Something
	}
	Document doc = null;
	try {
	    doc = parser.parse(xmlFile);
	} catch (SAXException saxException) {
	    // Do Something
	} catch (IOException ioException) {
	    // Do Something
	}

	XPath xpath = XPathFactory.newInstance().newXPath();

	try {

	    result = (Node) xpath.evaluate(expression, doc, XPathConstants.NODE);

	} catch (XPathExpressionException xPathExpressionException) {
	    // Do Something
	}
	
	Document parsedDoc = null;	
	OutputStream os = null;
	
	try {
	    parsedDoc = parser.newDocument();
	    Node importedNode = parsedDoc.importNode(result, true);
	    os = new ByteArrayOutputStream();

	    // Prepare the DOM document for writing
	    Source source = new DOMSource(importedNode);

	    // Prepare the output String
	    Result outpuResult = new StreamResult(os);

	    // Write the DOM document to the outputStream
	    Transformer xformer = TransformerFactory.newInstance().newTransformer();
	    xformer.setOutputProperty(OutputKeys.OMIT_XML_DECLARATION, "yes");
	    xformer.transform(source, outpuResult);
	    
        } catch (TransformerFactoryConfigurationError e) {
            // Do Something
        } catch (TransformerException e) {
            // Do Something
        } 
        
	 
	return os.toString();
    }

}