SQL functions ExistsNode and Extract cannot work in Servlet...

Following lines are codes of servlet:
package cbr;
import javax.servlet.*;
import javax.servlet.http.*;
import java.sql.*;
import java.io.*;
import oracle.xml.parser.v2.*;
import org.xml.sax.*;
import org.w3c.dom.*;
import oracle.jdbc.driver.*;
import oracle.sql.*;
import oracle.xdb.XMLType;
public class TestConnection extends HttpServlet
// Use the get command to recall the servlet
public void doGet(HttpServletRequest req,
HttpServletResponse resp)
throws ServletException, java.io.IOException
// Set the content type of the response
resp.setContentType("text/html");
// Create a PrintWriter object
java.io.PrintWriter out =
new java.io.PrintWriter(resp.getOutputStream());
// Print the HTML header option
out.println("<html>");
out.println("<head>");
out.println("<title>Test Connection</title>");
out.println("</head>");
out.println("<h2><center>");
out.println("Test Connection");
out.println("</center></h2>");
out.println("<br>");
          Connection conn = null;
          Statement s = null;
          ResultSet rset = null;
          try
               DriverManager.registerDriver(new oracle.jdbc.driver.OracleDriver());
               conn =
                    DriverManager.getConnection("jdbc:oracle:thin:@cbr.comp.polyu.edu.hk:1521:cbr", "system", "system");
               s = conn.createStatement();
               OraclePreparedStatement stmt;
               String qryStr = "SELECT xmlCase FROM xmlCaseBase WHERE xmlCase.existsNode('/test/New_co_name4') = 0 AND xmlCase.extract('/test/New_co_name3/newClass/newClass_GROUP/@New_name').getStringVal() = 'football' AND problemDomainID = 'test'";
               rset = s.executeQuery(qryStr);
catch (Exception ex) {
// Send the error back to the client
out.println("Exception!");
ex.printStackTrace(out);
//rc = false;
finally {
try {
// Always close properly
if (rset != null) {
rset.close();
if (s != null) {
s.close();
if (conn != null) {
conn.close();
catch (Exception ex) {
// Ignore any errors here
// Close stream
out.println("</html>");
out.flush();
out.close();
public void init(ServletConfig cfg)
throws ServletException
super.init(cfg);
public void destroy()
super.destroy();
It cannot work and has the following error message:
Exception! java.sql.SQLException: ORA-00904: invalid column name at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java, Compiled Code) at oracle.jdbc.ttc7.TTIoer.processError(TTIoer.java, Compiled Code) at oracle.jdbc.ttc7.Oall7.receive(Oall7.java, Compiled Code) at oracle.jdbc.ttc7.TTC7Protocol.doOall7(TTC7Protocol.java, Compiled Code) at oracle.jdbc.ttc7.TTC7Protocol.parseExecuteDescribe(TTC7Protocol.java, Compiled Code) at oracle.jdbc.driver.OracleStatement.doExecuteQuery(OracleStatement.java, Compiled Code) at oracle.jdbc.driver.OracleStatement.doExecuteWithTimeout(OracleStatement.java, Compiled Code) at oracle.jdbc.driver.OracleStatement.executeQuery(OracleStatement.java, Compiled Code) at cbr.TestConnection.doGet(TestConnection.java:56) at javax.servlet.http.HttpServlet.service(HttpServlet.java, Compiled Code) at javax.servlet.http.HttpServlet.service(HttpServlet.java, Compiled Code) at org.apache.jserv.JServConnection.processRequest(JServConnection.java, Compiled Code) at org.apache.jserv.JServConnection.run(JServConnection.java, Compiled Code) at java.lang.Thread.run(Thread.java, Compiled Code)
Would you please help me to investigate the problem and give me a solution? Thanks a lot!

Hi,
Just now I tried reproducing your problem on sp3/sp4/6.5, and for me it works fine.
You can find all mappings in "<Application server>/6.0/CCS0/HTTPAPI/ServletPatternTrans" node of registry. Just make sure that your mapping entry is there, otherwise you can add it here (see the mapping of FortuneServlet for the format) and restart the iAS and web-server (plugin) after that.
Please feel free to ask further questions.
Sanjeev,
Developer Support, Sun ONE Application Server-India.

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Hi Russ,
Thanks for the response.
Russ Proudman wrote:
1. I thought there was an analytical function similar to rank - or maybe an option of rank - that if there are duplicate records to have them all considered the same rank. So if you had 3 records all the same as rank=2 then a condition saying where rank=2 would return the 3 records. You could check into this.
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3. Finally, are you sure you're rank function is correct in that if you're getting blank lines, maybe the 'over' part is not considering all columns needed to determine the rank?
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