RequestDispatcher exception?

Hi,
Following sample code trying to forward a jsp page and pass a parameter to the next page
String t = "test";
request.setAttribute("t",t);
try{
RequestDispatcher aDispatcher = request.getRequestDispatcher("UnitScr.jsp");
aDispatcher.forward(request, response);
}catch(Exception ex){
ex.printStackTrace();
But receive following runtime exception. Please let me know if i missed something
java.lang.ClassCastException: oracle.jsp.provider.JspUniversalHttpRequest
void org.apache.tomcat.facade.RequestDispatcherImpl.doForward(javax.servlet.ServletRequest, javax.servlet.ServletResponse)
RequestDispatcherImpl.java:172

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<[ServletContext(id=28318025,name=testWebApp,context-path=/testWebApp)]
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rvle
tStubImpl.java:1053)
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weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.
java
:387)
at
weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.
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:305)
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weblogic.servlet.internal.RequestDispatcherImpl$ForwardAction.run(Reques
tDis
patcherImpl.java:382)
at
weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSu
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weblogic.security.service.SecurityManager.runAs(SecurityManager.java:118
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weblogic.servlet.internal.RequestDispatcherImpl.forward(RequestDispatche
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l.java:286)
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org.apache.struts.action.RequestProcessor.doForward(RequestProcessor.jav
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org.apache.struts.action.RequestProcessor.processForwardConfig(RequestPr
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Java lang null pointer exception

Hi
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i am using it for the other pages also
below is my code
package updates;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.RequestDispatcher;
import java.sql.Connection;
import java.sql.Statement;
import java.sql.ResultSet;
import Database.ConnectionPoolingPacs;
import java.sql.Blob;
public class EditBug extends HttpServlet {
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    Statement stmt=null;
    ResultSet rs=null;
    ConnectionPoolingPacs Con=null;
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    String SEVERITY ="";
    String BUG_ID="";
    String PROBABILITY="";
    String AUTHOR="";
    Blob BUGDESCRIPTION1,ASSIGNEECOMMENTS1,CLOSINGCOMMENTS1=null;
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    String STATUS,ASSIGNEDTO,CLOSEDBY=null;
    String IDENTIFIEDON,ASSIGNEDON,CLOSEDON=null;
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     response.setContentType("text/html");
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              try
              Con=new ConnectionPoolingPacs();
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              stmt=connect.createStatement();
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              rs=stmt.executeQuery(QueryStringTest);
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                AUTHOR=rs.getString("Bug_Author");
                SEVERITY=rs.getString("Bug_Severity");
                PROBABILITY=rs.getString("Bug_Probability");
                STATUS=rs.getString("Bug_Status");
                IDENTIFIEDON=rs.getString("Bug_IdentifiedOn");
                ASSIGNEDON=rs.getString("Bug_assignedOn");
                ASSIGNEDTO=rs.getString("Bug_AssignedTo");
                ASSIGNEECOMMENTS1=rs.getBlob("AssigneeComments");
                CLOSEDON=rs.getString("Bug_ClosedOn");
                CLOSEDBY=rs.getString("Bug_ClosedBy");
               CLOSINGCOMMENTS1=rs.getBlob("ClosingComments");
                request.setAttribute("id",BUG_ID);
                request.setAttribute ("title",BUGTITLE);
                request.setAttribute ("author",AUTHOR);
                request.setAttribute ("severity",SEVERITY);
                request.setAttribute ("probability",PROBABILITY);
                request.setAttribute ("status",STATUS);
                request.setAttribute ("identifiedon",IDENTIFIEDON);
                if ((ASSIGNEDON).equals("1001-01-01"))
                    ASSIGNEDON="";
                request.setAttribute ("assignedon", ASSIGNEDON);
                request.setAttribute ("assignedto", ASSIGNEDTO);
                 if ((CLOSEDON).equals("1001-01-01"))
                    CLOSEDON="";
                request.setAttribute ("closedon", CLOSEDON);
                request.setAttribute ("closedby", CLOSEDBY);
                byte[] buffer1 = BUGDESCRIPTION1.getBytes(1, (int) BUGDESCRIPTION1.length());
                 BUGDESCRIPTION = new String(buffer1);
                 byte[] buffer2 = ASSIGNEECOMMENTS1.getBytes(1, (int) ASSIGNEECOMMENTS1.length());
                ASSIGNEECOMMENTS = new String(buffer2);
                 byte[] buffer3 = CLOSINGCOMMENTS1.getBytes(1, (int) CLOSINGCOMMENTS1.length());
                CLOSINGCOMMENTS = new String(buffer3);
                 request.setAttribute ("description",BUGDESCRIPTION);
                if(ASSIGNEECOMMENTS!=null)
                 request.setAttribute ("assignecomments",ASSIGNEECOMMENTS);
                 if(CLOSINGCOMMENTS!=null)
                 request.setAttribute ("closingcomments", CLOSINGCOMMENTS);
                stmt.close();
                rs.close();
      catch(Exception e){System.out.println("Exception ;"+e);}
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          dispatcher.forward(request, response);
    }I have set 1001-01-01 as the default date.

This is the exception which i am getting
Aug 12, 2009 2:24:18 PM org.apache.catalina.core.StandardWrapperValve invoke
SEVERE: Servlet.service() for servlet EditBug threw exception
java.lang.NullPointerException
at org.apache.jsp.EditBug_jsp._jspService(EditBug_jsp.java:703)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:374)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:342)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:267)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:390)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:630)
at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:436)
at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:374)
at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:302)
at updates.EditBug.doPost(EditBug.java:124)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:390)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:286)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:845)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
at java.lang.Thread.run(Thread.java:619)
and that line which its indicating as error is
dispatcher.forward(request, response);
Edited by: garlapati on Aug 12, 2009 8:55 AM

Class cast exception in jsp plz help

i have written a jsp where i displayed a text box with value given by user inside it
when the user enters some other value in text box and clicks on update button then i forwarded reqeust to servlet which will some data base work
servlet will forward again to the same jsp with the new value in text box.
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help me what to do ........
thanking you in advance ..cheers

display cart.jsp file:
<%@ page import="java.util.*,org.*" %>
<html>
<body>
<%
Vector cartupdate = (Vector)session.getAttribute("cartlist");
for (int i = 0; i < cartupdate.size(); i++) {
CartListBean clb = (CartListBean)cartupdate.elementAt(i);
%>
<form name="itemslist<%=i%>" action="updateCart" method="post">
<input type="hidden" name="itemcode" value="<%=clb.getItemCode()%>">
     <input type="hidden" name="itemname" value="<%= clb.getItemName()%>">
<input type="hidden" name="price" value="<%= clb.getPrice()%>">
<%= clb.getItemName() %>
<input type="text" name="qty" value="<%=clb.getQuantity()%>">
<input type="submit" name="<%=clb.getItemCode()%>" value="update">
</form>
<br>
<%
%>
<form name="tobuy" action="buysrv" method="post">
<input type="submit" name="buy" value="BUY">
</form>
</body>
</html>
updatecart servlet code:
import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
import org.*;
import java.sql.*;
import java.util.*;
public class UpdateCart extends HttpServlet
public void service(HttpServletRequest request,HttpServletResponse response) throws IOException,ServletException
HttpSession session=request.getSession(false);
Vector cartupdate = (Vector)session.getAttribute("cartlist");
for (int i = 0; i < cartupdate.size(); i++) {
org.CartListBean cart = (org.CartListBean)cartupdate.elementAt(i);
if((cart.getItemCode()).equals(request.getParameter("itemcode")))
org.CartListBean clb=new org.CartListBean();
clb.setItemCode(request.getParameter("itemcode"));
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clb.setPrice(request.getParameter("price"));
cartupdate.setElementAt(clb,i);
session.setAttribute("cartlist",cart);
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System.out.println("got finished");
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Message was edited by:
143java

Exception while excel processing after upload using commons file upload

Hi all,
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import java.io.InputStream;
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import org.apache.poi.hssf.usermodel.HSSFSheet;
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                                   System.out.println("uploaded input stream available size is "+uploadedFileStream.available());
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                         HSSFRow row = (HSSFRow) rows.next();
                         Iterator cells = row.cellIterator();
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          finally{
               System.out.println("CES UPLOAD.SERVLET. ::: Finally");
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Message was edited by: Noufal
Noufal_k
Message was edited by:
Noufal_k

import org.w3c.dom.* ;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import jxl.*;
import org.apache.commons.fileupload.*;
import org.apache.commons.fileupload.disk.*;
import org.apache.commons.fileupload.servlet.*;
import org.apache.poi.poifs.filesystem.POIFSFileSystem;
import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.hssf.usermodel.HSSFRow;
public class CescoreUploadServlet extends baseHttpServlet
private DataSource cesDS = null;
public void doGet(HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException {
doPost(req, res);
public void doPost(HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException {
//including only relevant code
String targetPage = null;
System.out.println("Upload Controller");
HttpSession session = req.getSession(true);
try
String projIdValue = null;
String msg = null;
boolean isMultipart = FileUpload.isMultipartContent(req);
if(isMultipart){
System.out.println("is MultiPart");
DiskFileUpload upload = new DiskFileUpload();
List fileList = upload.parseRequest(req);
InputStream uploadedFileStream = null;
String uploadedFileName = null;
Iterator iter = fileList.iterator();
while (iter.hasNext()) {
System.out.println("inside while");
FileItem item = (FileItem) iter.next();
if (!item.isFormField()) {
System.out.println("item is not form field");
if (item.getSize() < 1)
throw new Exception("No file was uploaded");
else
uploadedFileName = item.getName();
System.out.println("uploaded file name "+uploadedFileName);//printing c:/excelsheets/fileToUpload.xls
System.out.println("uploaded file size is "+item.getSize());//printing size is 15872
uploadedFileStream = item.getInputStream();
System.out.println("uploaded input stream available size is "+uploadedFileStream.available());//printing available input stream size is 15872
else
System.out.println("item is form field");
String key = item.getFieldName();
String value = item.getString();
System.out.println("key is"+key);
System.out.println("value is"+value);
if(key.equals("projectId2")){
projIdValue = value;
System.out.println("outside while");
POIFSFileSystem fs = new POIFSFileSystem(uploadedFileStream);
System.out.println("got POIFSFileSystem");//this is been printed in logs
HSSFWorkbook wb = new HSSFWorkbook(fs);//it is breaking over here
System.out.println("got HSSFWorkbook");//this is not been printed in logs
HSSFSheet sheet = wb.getSheetAt(0);
System.out.println("got HSSFSheet");
Iterator rows = sheet.rowIterator();
if(rows.hasNext()){
while( rows.hasNext() ) {
System.out.println("rows iteration");
HSSFRow row = (HSSFRow) rows.next();
Iterator cells = row.cellIterator();
while( cells.hasNext() ) {
System.out.println("cell iteration");
HSSFCell cell = (HSSFCell) cells.next();
HashMap hm = new HashMap();//if everything is fine i'll use this hashmap to store values
System.out.println("CES UPLOAD.SERVLET. After adding");
msg = "Attendees have been added successfully";
req.setAttribute("msgText", msg);
targetPage = "/ces_disp.jsp";
else
throw new Exception("The Excel Sheet Uploaded has no entries. Please check and try again");
else{
throw new Exception("The Form is not Multipart");
catch (Exception e)
System.out.println("CES UPLOAD.SERVLET.EXCEPTION ::: Exception");
targetPage = "/ces_disp.jsp";
if(e != null) req.setAttribute("msgText", e.getMessage());
else req.setAttribute(Constants.EXCEPTION_ATTR_NAME, new Exception("Unknown Exception"));
e.printStackTrace();
finally{
System.out.println("CES UPLOAD.SERVLET. ::: Finally");
ServletContext stx = getServletConfig().getServletContext();
RequestDispatcher dispatcher = stx.getRequestDispatcher(targetPage);//throwing null pointer exception for this line
dispatcher.forward(req, res);
}

Error While using RequestDispatcher.forward

Hi All,
I am getting an error while i am forwarding a request from a controller servlet to a JSP in WAS 3.5.
i am using the following code:
String url = "../gede/globalservices/SCSLogin.jsp";
RequestDispatcher rd = getServletConfig().getServletContext().getRequestDispatcher(url);
rd.forward(request, response);
The error i get is :
Error 404
An error has occured while processing request:http://teamsite-cwc-review.indsys.ge.com/cwc/servlet/com.geindsys.gede.globalservices.SCSControllerServlet
Message: [JSP 1.0 Processor] reported an error
i was able to get the same while using response.SendRedirect(url);
Please help..
Thanks in Advance..
Regards,
Ravi.

Looks like your JSP is throwing an exception. Check the logs in your server to find the details about it. (Was there an XML question here? I couldn't see one.)

Problem with forward using RequestDispatcher

Dear All
Below is my code, which trying to use the RequestDispatcher.forward to go from a Servlet to a .jsp page.
and use
getServletContext().setAttribute("SvBio",vBio);
to set an attribute
It compiles finely but stuck at the forward request to the jsp page and through an exception which is given below.
BUT on removing this statement
getServletContext().setAttribute("SvBio",vBio);
from my doget method , it works and forwrds to the next page
please help me identifying the problem
Thanks
NAV
////Part of CODE////////////////
Vector vBio;
public void init()
// vector vBio initialize in init()
public void doGet(HttpServletRequest request, HttpServletResponse response)
     throws ServletException, IOException
getServletContext().setAttribute("SvBio",vBio);
if(param1 == bio)
gotoPage("/jsp_pages/bio_gp.jsp", request, response);
private void gotoPage(String address, HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException
RequestDispatcher dispatcher = getServletContext().getRequestDispatcher(address);
if(dispatcher !=null)
dispatcher.forward(request, response);
///exception//////////////////
HTTP Status 500 -
type Exception report
message
description The server encountered an internal error () that prevented it from fulfilling this request.
exception
org.apache.jasper.JasperException
     at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:254)
     at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:295)
     at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:241)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
     at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:684)
     at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:432)
     at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:356)
     at nav.gotoPage(nav.java:363)
     at nav.doGet(nav.java:319)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:740)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
     at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:247)
     at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193)
     at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:256)
     at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
     at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
     at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
     at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
     at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
     at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
     at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
     at org.apache.catalina.core.StandardContext.invoke(StandardContext.java:2417)
     at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:180)
     at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
     at org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatcherValve.java:171)
     at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:641)
     at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:172)
     at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:641)
     at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
     at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
     at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:174)
     at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
     at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
     at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
     at org.apache.coyote.tomcat4.CoyoteAdapter.service(CoyoteAdapter.java:193)
     at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:781)
     at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:549)
     at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:589)
     at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:666)
     at java.lang.Thread.run(Thread.java:595)
root cause
java.lang.NullPointerException
     at org.apache.jsp.bio_gp_jsp._jspService(bio_gp_jsp.java:59)
     at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:137)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
     at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:210)
     at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:295)
     at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:241)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
     at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:684)
     at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:432)
     at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:356)
     at nav.gotoPage(nav.java:363)
     at nav.doGet(nav.java:319)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:740)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
     at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:247)
     at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193)
     at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:256)
     at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
     at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
     at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
     at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
     at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
     at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
     at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
     at org.apache.catalina.core.StandardContext.invoke(StandardContext.java:2417)
     at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:180)
     at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
     at org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatcherValve.java:171)
     at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:641)
     at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:172)
     at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:641)
     at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
     at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
     at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:174)
     at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
     at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
     at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
     at org.apache.coyote.tomcat4.CoyoteAdapter.service(CoyoteAdapter.java:193)
     at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:781)
     at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:549)
     at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:589)
     at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:666)
     at java.lang.Thread.run(Thread.java:595)
Apache Tomcat/4.1.29-LE-jdk14

Thanks evnafets
I find out null pointer assignment in jsp page where forward request was heading.
There is one more question, if you help me a better understanding the issue
I have a HTML page invokes the servlet by passing value of parameter, Servlet do some procesing and forward to JSP page depending on the incoming parameter,
Can JSP page invoke the same servlet by passing some other parameter?
I tried doing this, but it returns an empty page and didnt went back to servlet.
HTML Page ---->Servlet--------> JSP page ---------> Servlet
I think Forward method shift the control from the Servlet to JSP page and now its the responsibility of the jsp page to deliver the response to the client.
Am i getting the empty page on invoking the servlet from the JSP page because I have not deliver the response to the client?
///the code of the JSP page is as fallows///
<html>
<head>
<meta http-equiv="Content-Language" content="en-us">
<meta http-equiv="Content-Type" content="text/html; charset=windows-1252">
<title>NAVTITLE</title>
</head>
<body link="#0000FF" vlink="#0000FF" alink="#0000FF">
<td height="340" width="977">
<p align="center"><font size="8" color="#001000"><b>biomolecular group           page</b></font></p>
<%@page import="java.util.Vector"%>
<% Vector vBiopt = (Vector)getServletContext().getAttribute("SvBio");
out.println("\nThe size of vBio is ::"+vBiopt.size());
int n = vBiopt.size();
%>
<p>This is the dynamic page generated for the biomolecular group</p>
<%
for(int k=0;k<n;k++)
String href1 ="http://localhost:8080/nav/nav2?param2=";
String item = (String)vBiopt.elementAt(k);
out.println("<p><a href= \"" + href1 + k + "\">" + item + "</a></p>");
%>
</body>
</html>

Nested request dispatches when using RequestDispatcher in a Button action

Hi all,
I am new to JSF so I am probably missing something very simple, please help:
The test case is simple: I created one visual web page with one button and one normal JSP file(named test.jsp) using Netbeans 5.5 with visual web pack on Sun Application Server 9 PE. The code action for the button is as follows:
public String button1_action() throws Exception
        ExternalContext context = FacesContext.getCurrentInstance().getExternalContext();
        HttpServletRequest request = (HttpServletRequest) context.getRequest();
        HttpServletResponse response = (HttpServletResponse) context.getResponse();
        RequestDispatcher dispatcher = request.getRequestDispatcher("test.jsp");
        dispatcher.forward(request,response);
        return null;
    }Once the JSF page is loaded and the button is clicked, this exception occurs:
ApplicationDispatcher[WebApplication1] Servlet.service() for servlet Faces Servlet threw exception
javax.servlet.ServletException: WEB2651: Exceeded maximum depth for nested request dispatches: 20
at org.apache.catalina.core.ApplicationDispatcher.doInvoke(ApplicationDispatcher.java:837)
at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:697)
at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:532)
at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:465)
at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:353)
at webapplication1.Page1.button1_action(Page1.java:242)
Can anyone provide any advice on how to resolve this issue?

Hi Rachel,
As per the Servlet2.3 Javadoc:
The pathname must begin with a "/" and is interpreted as relative to the current context root.
If you make that change and include the complete path, then it would work fine.
Ex:
If your context looks like http://my.company.com/webapp1/ and if you were to have your forwardPortlet.jsp in a directory like:
webapp1
  |
  |-> htdocs
         |
         |-> forwardPortlet.jsp
then, your code would look like;
RequestDiscpatcher d = request.getRequestDispatcher("/htdocs/forwardPortlet.jsp");
HTH,
thanks,
harsha

Illegal State Exception with Servlets

Hi Friends,
I am using RequestDispatcher to forwrd my request from one servlet to another
Here's the code
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.sql.*;
public class TryServlet extends HttpServlet
public void service(HttpServletRequest request,HttpServletResponse response)throws ServletException,IOException
try
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
String url="jdbc:odbc:con";
Connection con= DriverManager.getConnection(url,"scott","tiger");
Statement stmt=con.createStatement();
ResultSet rst=stmt.executeQuery("select * from Projects");
response.setContentType("text/html");
PrintWriter out=response.getWriter();
while (rst.next())
String firstname=rst.getString("PIN");
String lastname=rst.getString("ProjectTitle");
out.println("<p> Name:"+firstname+" "+lastname+"");
con.close();
RequestDispatcher rd=getServletContext().getNamedDispatcher("HelloServlet");
rd.forward(request,response);
return;
catch(Exception e)
e.printStackTrace();
I m getting the error
java.lang.IllegalStateException: Cannot forward after response has been committed
i need to include the two rows of tables before i forwad the request to HelloServlet
What needs to be done?
thanx
Pooja

import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.sql.*;
public class TryServlet extends HttpServlet
public void service(HttpServletRequest request,HttpServletResponse response)throws ServletException,IOException
try
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
String url="jdbc:odbc:con";
Connection con= DriverManager.getConnection(url,"scott","tiger");
Statement stmt=con.createStatement();
ResultSet rst=stmt.executeQuery("select * from Projects");
response.setContentType("text/html");
PrintWriter out=response.getWriter();
while (rst.next())
String firstname=rst.getString("PIN");
String lastname=rst.getString("ProjectTitle");
out.println("<p> Name:"+firstname+" "+lastname+"");
con.close();
RequestDispatcher rd=getServletContext().getNamedDispatcher("HelloServlet");
rd.forward(request,response);
return;
catch(Exception e)
e.printStackTrace();
please explain your problem for more details???

Exceptions thrown after a jsp:include

Hi all,
          At the beginning of my JSP, I can't use the JSP include directive because I
          need to do a specific include from another webapp servlet context. Thus I
          wrote my own include tag <mytag:include page="" context=""/> where I use
          RequestDispatcher.include().
          But then I am facing the following problem with this JSP :
          [myjsp.jsp]
          <mytaglib:include page="" context=""/>
          <mytaglib:stgElse/>
          if the second tag <mytaglib:stgElse> is throwing a JspException, and if I
          use the error handling system of the webapp :
          [web.xml]
          <error-page>
          <exception-type>javax.servlet.jsp.JspException</exception-type>
          <location>/web/en/pf/error.jsp</location>
          </error-page>
          I get : "java.lang.IllegalStateException: Cannot forward a response that is
          already committed"
          because it tries to do a forward after an include which needed a flush of
          the buffer previously, what means the response was already comitted.
          Thus the question is : how to handle exceptions coming after an include was
          done, that is to say after a flush of the buffer has already been committed
          Thanks for any help.
          Yann


In the doc, it states:
sendRedirect
If the response has already been committed, this method throws an
IllegalStateException. After using this method, the response should be
considered to be committed and should not be written to.
In other words, you must not do anything before or after with the response.
Cameron Purdy, LiveWater
"Lawrence Lourduraj" <[email protected]> wrote in message
news:8ip9p4$r0g$[email protected]..
>
Friends,
How do I do a redirect either through HttpServletResponse.sendRedirect ()or
<jsp:forward /> in a JSP that does a <jsp:include /> at the top.
I am getting a IllegalState exception.
Thanks
Regards
Lawrence Lourduraj
VocaLoca Inc.

RequestDispatcher - What is the expected behaviour defined by the spec

Hello,
I just try to understand the servlet specification correctly.
I don't understand what should happen when I try to access an not-existent resource by means of the RequestDispatcher.
That's the way my source code looks:
RequestDispatcher rd = servletRequest.getRequestDispatcher(jspName);
try {
if (rd != null) rd.include(origRQ, desc.getResponse());
} catch (Exception e) { e.printStackTrace(); } I see following possibilities:
1.
The RequestDispatcher is not null and invoking the method include
on the RequestDispatcher will lead to a 404 Http error.
2.
The RequestDispatcher is not null and invoking the method include
or forward on the RequestDispatcher will lead to a ServletException (the
root exception of this is a FileNotFoundException)
3.
The requestDispatcher is null
I don't see anything about this in the servlet specification.
Maybe I just don't find it. What should be the behaviour defined
by the servlet spec.
Any help appreciated.
Many thanks in advance.

Thanks for your answers.
So this means this behaviour differs from servlet container to servlet container and it is not determined by the specification. I asked this
question mainly, because I observed different behaviour for two different servlet container and I wanted to clarify which behaviour
is the correct one.
In ServletExec I got back a 404 error. In Iona's servlet engine I got
back a ServletExecption (root cause is a FileNotFoundException).

Proper use of RequestDispatcher.forward()

I have a servlet, and want to forward on to an error JSP page for
          exceptions. Is RequestDispatcher.forward() supposed to return to the
          source servlet when the target is finished?
          I am using a return to stop the source servlet when the target is
          finshed. Is this the correct behavior? Isn't this behavior very
          similar to to include(), or is the only difference that include() does
          not clear the source servlet's response buffer?
          TIA,
          Alex


Alexander,
          The forward kindof has to return to the source servlet because that's
          where it's called from(unless it threw an exception). A servlet that
          performs a forward is meant to do preliminary processing of the request and
          allow another resource to generate the response. You are right in that it is
          basically an include that clears the buffer. If you want it to make a whole
          new request you should probably use a redirect.
          The weblogic docs help clarify things a bit(as well as the regular
          javadocs). http://www.weblogic.com/docs51/classdocs/API_servlet.html#129331
          Hope this helped.
          -jeremy
          Alexander Kowalyshyn <[email protected]> wrote in message
          news:[email protected]..
          > I have a servlet, and want to forward on to an error JSP page for
          > exceptions. Is RequestDispatcher.forward() supposed to return to the
          > source servlet when the target is finished?
          >
          > I am using a return to stop the source servlet when the target is
          > finshed. Is this the correct behavior? Isn't this behavior very
          > similar to to include(), or is the only difference that include() does
          > not clear the source servlet's response buffer?
          >
          > TIA,
          >
          > Alex
          >

Calling a html page deployed in weblogic server using RequestDispatcher

Hi All,
I want to call a HTML page from a java page using requestdispatcher. The whole application is deployed in Weblogic server.I have used the below syntax to call the page from any machine..
ServletContext sc = getServletContext();
RequestDispatcher rd = sc.getRequestDispatcher("http://172.25.40.148:7001/Filecomparetool/Result3.html");
rd.forward(req, res);
Im getting Null pointer exception...Plz help..Thanks in advance!

Please use the CODE tags (see the CODE button above, or the formatting tips page, and not the BOLD button.
Post the stack trace.
Either getServletContext or getRequestDispatcher is returning null. Find out which, read the API to find out why.

RequestDispatcher error

          hi
          while using the the forward method in RequestDispatcher, i encounter the error below. it is complaining that it cant find the method "RequestDispatcherImpl.forward".
          as my machine has a few different JDKs, is there the possiblity of it using the wrong one? i have set my JAVA_HOME to JDK1.2.2 though.
          i have checked that my classpaths are set correctly as well.
          any help is much appreciated.
          thanx
          yunyee
          ********* Error Log **********
          Mon Nov 27 17:41:28 GMT+08:00 2000:<E> <ServletContext-General> Servlet failed with Exception
          java.lang.NoSuchMethodError
          at weblogic.servlet.internal.RequestDispatcherImpl.forward(RequestDispatcherImpl.java:95)


Hello,
          I suppose u should first download the j2eesdk1.2.2 , or simply download the jsdk (Java Servlet Development Kit) from developer connection in java.sun.com.
          In fact, your library for servlet may just support Servlets spec. 2.1, which does not contain the imple. of RequestDispatcher.
          Anthony
          yunyee wrote:
          > hi
          >
          > while using the the forward method in RequestDispatcher, i encounter the error below. it is complaining that it cant find the method "RequestDispatcherImpl.forward".
          >
          > as my machine has a few different JDKs, is there the possiblity of it using the wrong one? i have set my JAVA_HOME to JDK1.2.2 though.
          > i have checked that my classpaths are set correctly as well.
          >
          > any help is much appreciated.
          > thanx
          >
          > yunyee
          >
          > ********* Error Log **********
          > Mon Nov 27 17:41:28 GMT+08:00 2000:<E> <ServletContext-General> Servlet failed with Exception
          > java.lang.NoSuchMethodError
          > at weblogic.servlet.internal.RequestDispatcherImpl.forward(RequestDispatcherImpl.java:95)
          Click here for Free Video!!
          http://www.gohip.com/free_video/
          [ctlai.vcf]

Character Encoding Problem RequestDispatcher

Hi Friends;
I have a servlet and I use
RequestDispatcher dispatcher = request.getRequestDispatcher(page);
               response.setContentType("text/html;charset=UTF-8");
               request.setCharacterEncoding("UTF-8");
               PrintWriter out = response.getWriter();
               //request.setCharacterEncoding("utf-8");
               try {
                    dispatcher.forward(request, response);
               } catch (ServletException e) {
                    e.printStackTrace();
               } catch (IOException e) {
                    e.printStackTrace();
for forward page. But if i forward a page, this pages' encoding isnot working. But if i refresh page it works.
How can i handle this encoding.
Thanks replies

Hi Eray,
It really doesn't make any sense (exept in very specific, well, exceptional cases) to call setContentType and/or getWriter on the response object before doing a forward (neither does calling setCharacterEncoding on the request object usually makes sense);
request.getRequestDispatcher(page).forward(request, response);
should be sufficient. I assume you forward to a jsp page? In case you want to enforce the response encoding of the content of the jsp page to be UTF-8, you can use this page directive at the top of your jsp page:
<%@ page contentType="text/html; charset=UTF-8" %>
I don't know why it does work when you refresh the page, maybe your browser configuration is not correct (in IE: Page/View > Encoding > Auto-Select)?
Kind regards,
Sigiswald

RequestDispatcher exception?

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