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Use XPath in servlet

import java.io.IOException; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.jdom.Document; import org.jdom.JDOMException; import org.jdom.input.SAXBuilder; import org.jdom.xpath.XPath; public class PostServlet extends HttpServlet {     private SAXBuilder builder = new SAXBuilder();     private XPath nameXPath;     private XPath yearXPath;     protected void doPost(HttpServletRequest request,             HttpServletResponse response) throws ServletException, IOException {         if (!"text/xml".equals(request.getContentType())) {             response.getWriter().println("Please post as text/xml.");         } else {             try {                 Document doc = builder.build(request.getReader());                 StringBuffer buff = new StringBuffer();                 buff.append("You searched for name '" + nameXPath.valueOf(doc)                         + "'");                 String year = yearXPath.valueOf(doc);                 if (!"notselected".equals(year)) {                     buff.append(" and year '" + year + "'");                 }                 buff.append(".");                 response.getWriter().print(buff.toString());             } catch (JDOMException e) {                 response.getWriter().print(                         "Error getting search terms: " + e.getMessage());             }         }     }     public void init() throws ServletException {         try {             nameXPath = XPath.newInstance("/search/name/text()");             yearXPath = XPath.newInstance("/search/year/text()");         } catch (JDOMException e) {             throw new ServletException("Unable to create XPaths", e);         }         super.init();     } }