XPath Expression not working factory.setNamespaceAware(true); . If I comment out the line its working properly. May I know why its not working with Namesapce Aware ? package com.test; import java.io.IOException; import java.io.StringReader; import javax.xml.parsers.DocumentBuilder; import javax.xml.parsers.DocumentBuilderFactory; import javax.xml.parsers.ParserConfigurationException; import javax.xml.xpath.XPath; import javax.xml.xpath.XPathConstants; import javax.xml.xpath.XPathExpression;