Control client cache for JSP

There are many threads on the web about how to force a reload rather than pulling content from cache. My problem is the opposite. I am trying to get good cache control for a jsp application that has relatively static contents. My goal is to serve up pages with the following characteristics:
For client calls:
If there is no version in cache, the jsp builds a new version and sets the response date header "Expires" to 5 days later.
If within the Expires date, have the client just use the cached version: no validation or roundtripping.
If after the Expires date, roundtrip: have the jsp return 303 (SC_NOT_MODIFIED) if no content changed. Also, ideally, also reset the Exipres date to an additional 5 days.
Otherwise, recreate the response and start over...
I am experiencing different behaviors with different browsers, although none act as I was hoping.
When there is no relevant page in cache, all of the browsers accept a new version (and I think that they all put it in cache). All browsers reload the page using the reload button.
If there is a relevant page in cache and it has not expired:
1. FireFox 3 seems to roundtrip, but then use the version in cache.
2. IE 7 seems to always use the cache version without checking the server
3. Google Chrome seems to always roundtrip and reload.
I tried several variations including setting/not setting the Last-Modified date header and setting/not Cache-Control: no-control header (to force validation).
Neither Last-Modified nor no-contro: NO CHANGE FROM ABOVE;
Last-Modified set, no-control not specified: NO CHANGE
Last-Modified not set, Cache-Control set to no-control to force validation.
The main problem here is that I was unable to get a value for the request header "Last-Modifier" so that my jsp could not set the 303 return, therefore all browsers roundtrip and reload.
SO...
1. What do I need to do to get all browsers to pull from cache and not roundtrip prior to the Expires date?
2. After the Expires date, what do I need to do to get the request to include the Last-Modified date header sent to the server?
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><%
%><%@ page import="java.net.*"%><%
%><%@ page import="java.util.*"%><%
%><%@ page import="java.util.Date"%><%
%><%@ page import="javax.servlet.*"%><%
%><%@ page import="java.text.SimpleDateFormat" %><%
// In a real application, the updatedDate would come from a database or file
Calendar thisCal = new GregorianCalendar();
thisCal.set(2009,02,15);
Date     updateDate = thisCal.getTime();
// This never returns a valid date
long thisLongDate = request.getDateHeader("Last-Modified");
Date cachedDate    = ((thisLongDate<0)?null:new Date(thisLongDate));
Date todaysDate    = new Date();
// Show all three dates in the output
String   outString = "";
SimpleDateFormat   showDateFormatter = new SimpleDateFormat ("yyyy-MM-dd hh:mm:ss");
outString += "================================================================<br> \n";
outString += " Start TestSuite25.jsp "+showDateFormatter.format(todaysDate)+"<br> \n";
outString += "Update date is "+showDateFormatter.format(updateDate)+"<br> \n";
outString += "Cached date is "+((cachedDate==null)?null:showDateFormatter.format(cachedDate))+"<br> \n";
response.setContentType("text/html");
if (request.getParameter("lastmodified") != null)
   outString += "Set Last Modified header: may trigger If-Modified-Since request. <br> \n";
   response.setDateHeader("Last-Modified",updateDate.getTime());
// force validation .. does this hit my code??
if (request.getParameter("cache") != null)
    outString += "Set cache control to no-cache to force validation on every call<br> \n";
    response.setHeader("Cache-Control", "no-cache");
// use cache for 5 days, then validate
thisCal.setTime(todaysDate);
thisCal.add(Calendar.DATE,5);
response.setDateHeader("Expires", thisCal.getTime().getTime());
// Check for still fresh on server
if (!(cachedDate == null) && (!cachedDate.before(updateDate)))
   outString += "Contents are unchanged: send 303 status message<br> \n";
   response.setStatus(HttpServletResponse.SC_NOT_MODIFIED);
   System.out.println(outString);
else
   outString += "Rebuild and send the HTML <br>";
   System.out.println(outString);
   // Build and send the HTML ...
%>
<html>
<head>
<title>Test suite</title>
<meta http-equiv="content-type" content="text/html; charset=ISO-8859-1">
</head>
<body >
<br>
<h2 align="center">Test 25: Controlling Cache</h2>
<h3 align="center">Click <a href="TestSuite21.html">here</a> to continue to Test 26.</h3>
useage: TestSuite25.jsp<br>
optional parameters: <br>
   cache=nocache: include no-cache to force validation each time<br>
   lastmodify=set: include Last-Modified date hearer<br>
<br>
<%=outString%>
</html>
</body>
<% } %>

let me tell you from BSP side !
within your BSP application set a javascript timer for 2 minutes and upon completion run a javascript to kill the backend session along with the SSO2 cookie.
check the BSP application system/session_single_frame.htm
for a javascript named "exitBSPApplication"
Hope this is helpful.
Regards
Raja

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java version "1.4.2_11"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.
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looking in C:\Program Files\Java\j2re1.4.2_11\bin
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Found: C:\WINNT\system32\wjview.exe
Looking in C:\WINNT
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Ignoring 'C:\WINNT\javaw.exe' because it is in a Windows System Directory.
Ignoring 'C:\WINNT\jre.exe' because it is in a Windows System Directory.
Ignoring 'C:\WINNT\jrew.exe' because it is in a Windows System Directory.
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Looking in c:\Fusa\DLL
Looking in C:\TD
Looking in C:\Program Files\CA\AllFusion Harvest Change Manager
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ctory.
Ignoring 'C:\WINNT\system32\javaw.exe' because it is in a Windows System Dir
ectory.
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tory.
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Found: C:\WINNT\system32\jview.exe
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Looking in C:\WINNT
Ignoring 'C:\WINNT\java.exe' because it is in a Windows System Directory.
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Ignoring 'C:\WINNT\jrew.exe' because it is in a Windows System Directory.
Looking in C:\WINNT\System32\Wbem
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Looking in C:\TD
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ORDERING VMS
1: C:\Profiles\sys1mi\temp_installs\j2sdk1.4.2_11\bin\java.exe (in path)
2: C:\Profiles\sys1mi\temp_installs\j2sdk1.4.2_11\bin\javaw.exe (in path)
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CHINE\SOFTWARE\JavaSoft\Java Plug-in\1.4.2_03)
6: C:\Program Files\Java\j2re1.4.2_03\bin\javaw.exe (in registry at HKEY_LOCAL_M
ACHINE\SOFTWARE\JavaSoft\Java Plug-in\1.4.2_03)
7: C:\Program Files\Java\j2re1.4.2_11\bin\java.exe (in registry at HKEY_LOCAL_MA
CHINE\SOFTWARE\JavaSoft\Java Plug-in\1.4.2_11)
8: C:\Program Files\Java\j2re1.4.2_11\bin\javaw.exe (in registry at HKEY_LOCAL_M
ACHINE\SOFTWARE\JavaSoft\Java Plug-in\1.4.2_11)
9: C:\Program Files\Java\j2re1.4.2_11\bin\java.exe (in registry at HKEY_LOCAL_MA
CHINE\SOFTWARE\JavaSoft\Java Runtime Environment\1.4)
10: C:\Program Files\Java\j2re1.4.2_11\bin\javaw.exe (in registry at HKEY_LOCAL_
MACHINE\SOFTWARE\JavaSoft\Java Runtime Environment\1.4)
11: C:\Program Files\Java\j2re1.4.2_03\bin\java.exe (in registry at HKEY_LOCAL_M
ACHINE\SOFTWARE\JavaSoft\Java Runtime Environment\1.4.2_03)
12: C:\Program Files\Java\j2re1.4.2_03\bin\javaw.exe (in registry at HKEY_LOCAL_
MACHINE\SOFTWARE\JavaSoft\Java Runtime Environment\1.4.2_03)
13: C:\Program Files\Java\j2re1.4.2_11\bin\java.exe (in registry at HKEY_LOCAL_M
ACHINE\SOFTWARE\JavaSoft\Java Runtime Environment\1.4.2_11)
14: C:\Program Files\Java\j2re1.4.2_11\bin\javaw.exe (in registry at HKEY_LOCAL_
MACHINE\SOFTWARE\JavaSoft\Java Runtime Environment\1.4.2_11)
Searching for console vm.
lax.nl.valid.vm.list=J2 J1 MSJ
lax.nl.current.vm=.
was not a valid Win32 executable.
SUCCESS! C:\Profiles\sys1mi\temp_installs\j2sdk1.4.2_11\bin\java.exe
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set CLASSPATH=C:\Profiles\sys1mi\LOCALS~1\Temp\I1180638584\InstallerData\IAClass
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C:\Profiles\sys1mi\LOCALS~1\Temp\I1180638584\InstallerData\Execute.zip;C:\Profil
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i\LOCALS~1\Temp\I1180638584\Windows\InstallerData\Resource1.zip;C:\Profiles\sys1
mi\LOCALS~1\Temp\I1180638584\InstallerData;C:\Profiles\sys1mi\LOCALS~1\Temp\I118
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31648 -noverify com.zerog.lax.LAX C:\\Profiles\\sys1mi\\LOCALS~1\\Temp\\I1180638
584\\Windows\\WorkshopInstaller.lax C:\\Profiles\\sys1mi\\LOCALS~1\\Temp\\env.pr
op
executing java...
LAX Version = 5.5
IAResourceBundle: create resource bundle: en
LOADING Resource path: i18nresources\custom_en
LOADING Resource path: locales\custom_en
seaFilename = WorkshopInstaller
Default properties location = C:\Profiles\sys1mi\Desktop\temp\
Installer PropertiesFile = C:\Profiles\sys1mi\Desktop\temp\installer.properties
UI Mode set to Default - SWING.
InstallAnywhere 6.0 Enterprise
Thu May 31 15:10:23 EDT 2007
Free memory = 14953 kB
Total memory = 16320 kB
No arguments.
java.class.path:
C:\Profiles\sys1mi\LOCALS~1\Temp\I1180638584\InstallerData\IAClasses.zip
C:\Profiles\sys1mi\LOCALS~1\Temp\I1180638584\Windows\resource\jdglue.zip
C:\Profiles\sys1mi\LOCALS~1\Temp\I1180638584\InstallerData\Execute.zip
C:\Profiles\sys1mi\LOCALS~1\Temp\I1180638584\Windows\InstallerData\Execute.z
ip
C:\Profiles\sys1mi\LOCALS~1\Temp\I1180638584\InstallerData\Resource1.zip
C:\Profiles\sys1mi\LOCALS~1\Temp\I1180638584\Windows\InstallerData\Resource1
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C:\Profiles\sys1mi\LOCALS~1\Temp\I1180638584\InstallerData
C:\Profiles\sys1mi\LOCALS~1\Temp\I1180638584\Windows\InstallerData
C:\Profiles\sys1mi\temp_installs\j2sdk1.4.2_11\lib\dt.jar
C:\Profiles\sys1mi\temp_installs\j2sdk1.4.2_11\lib\htmlconverter.jar
C:\Profiles\sys1mi\temp_installs\j2sdk1.4.2_11\lib\tools.jar
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C:\Profiles\sys1mi\LOCALS~1\Temp\I1180638584\InstallerData\IAClasses.zip
C:\Profiles\sys1mi\LOCALS~1\Temp\I1180638584\Windows\resource\jdglue.zip
C:\Profiles\sys1mi\LOCALS~1\Temp\I1180638584\InstallerData\Execute.zip
C:\Profiles\sys1mi\LOCALS~1\Temp\I1180638584\InstallerData
C:\Profiles\sys1mi\temp_installs\j2sdk1.4.2_11\lib\htmlconverter.jar
sun.boot.class.path:
C:\Profiles\sys1mi\temp_installs\j2sdk1.4.2_11\jre\lib\rt.jar
C:\Profiles\sys1mi\temp_installs\j2sdk1.4.2_11\jre\lib\i18n.jar
C:\Profiles\sys1mi\temp_installs\j2sdk1.4.2_11\jre\lib\sunrsasign.jar
C:\Profiles\sys1mi\temp_installs\j2sdk1.4.2_11\jre\lib\jsse.jar
C:\Profiles\sys1mi\temp_installs\j2sdk1.4.2_11\jre\lib\jce.jar
C:\Profiles\sys1mi\temp_installs\j2sdk1.4.2_11\jre\lib\charsets.jar
C:\Profiles\sys1mi\temp_installs\j2sdk1.4.2_11\jre\classes
java.ext.dirs:
C:\Profiles\sys1mi\temp_installs\j2sdk1.4.2_11\jre\lib\ext
java.version == 1.4.2_11 (Java 2+)
java.vm.name == Java HotSpot(TM) Client VM
java.vm.vendor == Sun Microsystems Inc.
java.vm.version == 1.4.2_11-b06
java.vm.specification.name == Java Virtual Machine Specification
java.vm.specification.vendor == Sun Microsystems Inc.
java.vm.specification.version == 1.0
java.specification.name == Java Platform API Specification
java.specification.vendor == Sun Microsystems Inc.
java.specification.version == 1.4
java.vendor == Sun Microsystems Inc.
java.vendor.url == http://java.sun.com/
java.class.version == 48.0
java.compiler == null
java.home == C:\Profiles\sys1mi\temp_installs\j2sdk1.4.2_11\
jre
java.io.tmpdir == C:\Profiles\sys1mi\LOCALS~1\Temp\
os.name == Windows XP
os.arch == x86
os.version == 5.1
path.separator == ;
file.separator == \
file.encoding == Cp1252
user.name == sys1mi
user.home == C:\Profiles\sys1mi
user.dir == C:\Profiles\sys1mi\LOCALS~1\Temp\I1180638584\Wi
ndows
user.language == en
user.region == null
Installer: InstallAnywhere 6.0 Enterprise Build 2262
System's temporary directory = C:\Profiles\sys1mi\Local Settings\Temp
Installer: looking for Win32 DLLs in C:\Profiles\sys1mi\LOCALS~1\Temp\I118063858
4\InstallerData\..\Windows\resource
allocating more
allocating more
allocating more
allocating more
RepositoryManager: lock acquired on: C:\Program Files\Zero G Registry\.com.zerog
.registry.lock
allocating more
allocating more
allocating more
allocating more
IAVariables: Converting property: prop, to: 0000-trial
Searching for Resources - C:\Profiles\sys1mi\Local Settings\Temp\I1180638584\In
stallerData\Disk1\InstData\Resource1.zip
launchDir: C:\Profiles\sys1mi\Desktop\temp
installer.properties exists? true
version: IS_TRIAL_VERSION
prod: 0000
build id=608
versionInfo: major: 3 minor: 3 micro: 0 buildNumber: 608 release name:
java.io.IOException: CreateProcess: $USER_INSTALL_DIR$$/$jre\jre\bin\java.exe -v
ersion error=2
at java.lang.Win32Process.create(Native Method)
at java.lang.Win32Process.<init>(Win32Process.java:66)
at java.lang.Runtime.execInternal(Native Method)
at java.lang.Runtime.exec(Runtime.java:566)
at java.lang.Runtime.exec(Runtime.java:428)
at java.lang.Runtime.exec(Runtime.java:364)
at java.lang.Runtime.exec(Runtime.java:326)
at com.m7.installer.InstallerUtil.getVersion(InstallerUtil.java:154)
at com.m7.installer.InstallerUtil.checkVersion(InstallerUtil.java:101)
at com.m7.installer.CheckInstallerVM.install(CheckInstallerVM.java:33)
at com.zerog.ia.installer.actions.CustomAction.installSelf(DashoA8113)
at com.zerog.ia.installer.AAMgr.a(DashoA8113)
at com.zerog.ia.installer.AAMgr.a(DashoA8113)
at com.zerog.ia.installer.AAMgr.b(DashoA8113)
at com.zerog.ia.installer.AAMgr.c(DashoA8113)
at com.zerog.ia.installer.AAMgr.a(DashoA8113)
at com.zerog.ia.installer.AAMgr.b(DashoA8113)
at com.zerog.ia.installer.AAMgr.c(DashoA8113)
at com.zerog.ia.installer.AAMgr.a(DashoA8113)
at com.zerog.ia.installer.AAMgr.b(DashoA8113)
at com.zerog.ia.installer.AAMgr.c(DashoA8113)
at com.zerog.ia.installer.AAMgr.a(DashoA8113)
at com.zerog.ia.installer.AAMgr.b(DashoA8113)
at com.zerog.ia.installer.AAMgr.c(DashoA8113)
at com.zerog.ia.installer.AAMgr.a(DashoA8113)
at com.zerog.ia.installer.AAMgr.a(DashoA8113)
at com.zerog.ia.installer.Main.b(DashoA8113)
at com.zerog.ia.installer.Main.d(DashoA8113)
at com.zerog.ia.installer.Main.a(DashoA8113)
at com.zerog.ia.installer.Main.main(DashoA8113)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.
java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAcces
sorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:324)
at com.zerog.lax.LAX.launch(DashoA8113)
at com.zerog.lax.LAX.main(DashoA8113)
JRE command: $USER_INSTALL_DIR$$/$jre\jre\bin\java.exe -version
JRE version: null

Do you have multiple versions of Java installed? I had a weird problem a
while back with a messed up registry and multiple Java installations.
br
Jessica Gaudette wrote:
Hi,
I am having the identical problem, but with BEA Workshop Studio. I've followed the instructions provided to resolve it, but I still get the same error, What am I doing wrong? Below is my variable:
PATH=C:\Program Files\Java\jdk1.5.0\bin
When I hold down the control button to get the error log it APPEARS to locate the JDK, but at the very end, when it looks for the JRE it is null.

Apache caching in jsp

my first problem :
is whenever i update/debug or simply add a new code to my .jsp file, i can't immediately see its output what i do get is an old page. for example, sample.jsp contains 2 submit buttons and then i deleted one button but when i run my sample.jsp page it still displays 2 submit.
my theory:
so far, i think it has something to do w/ the cache because when i restarted my apache, i can now see one button.
my next problem:
if that's the case, then all users of my site have to restart their apache and i think this totally defeats the purpose of my site in the first place. it will only make things more complicated.
my plea:
can somebody help me???
thanks

it is often necessary... The browser cache should be ignored by shift click/ shift reload, but if you are behind a firewall or proxy server that caches files, then no matter how hard you press the shift key, it won't tell the firewall cache to go to the server. I don't know that there is a caching firewall in this circumstance, but unless it's for a intranet that you really know about, you can't assume that people won't be hitting the site from the other side of a caching firewall. This would be totally transparent to the user (and his/her browser). Which is why if I have a JSP page or servlet (which nearly always has content I won't want cached) I include the no-cache headers to tell any cache to not store the file.
response.setHeader("Cache-Control", "no-cache");
response.setHeader("Pragma", "no-cache");
response.setDateHeader("Expires", 0);
between the 3 lines, it should take care of browser cache and proxy cache.

Unable to compile class for JSP

Please can anyone help me to solve this.
Actually,this is the condition.
In my db,there is a table called UserPassword, which has 4
fields(empNo,UserName,password,level). Now I want to do these things:
When the user submits the data to create a new account via HTML form, it submits the data to the file called CreateAcc.jsp. In this file it perform some logic,here are they.
1)To check the empNo,if it is already exist in the DB,
     if empNo =exist then display error.(record already exist)
     if empNo =notexist then do task 2).
2)check the UserName,if it is already exist in the db,
     if UserName=exist then display error.(because it's a primary key)
     if UserName=notexist then do task 3).
3)Create a new user account and save it to the db.
To do these tasks,I never create a new objects for the tasks 1) and 2).
only for task 3)create an object.
Is it the right way?
Here is the file CreateAcc.jsp
<%@ page language="java" %>
<%@ page import="core.UserAccManager" %>
<%@ page import="data.UserPassword" %>
<jsp:useBean id="UserAccManager" class="core.UserAccManager" scope="session"/>
<jsp:setProperty name="UserAccManager" property="*"/>
<jsp:useBean id="UserPassword" class="data.UserPassword" scope="session"/>
<jsp:setProperty name="UserPassword" property="*"/>
<%
String nextPage ="MainForm.jsp";
if(UserPassword.verifyEmpno()){
     if(UserPassword.verifyUsername()){
          if(UserPassword.createAcc()) nextPage ="MsgAcc.jsp";
      }else{
           nextPage="UserNameExist.jsp";
      else{
          nextPage="UserAccError.jsp";
%>
<jsp:forward page="<%=nextPage%>"/>The directory structure:
UserPassword.java- F:/Project/core/data/UserPassword.java
UserAccManager.java - F:/Project/core/UserAccManager.java
Now both are compiling.I put the class files into the TOMCAT,as follows.
UserAccManager.class - webapps/mySystemName/WEB-INF/classes/core/
UserPassword.class - webapps/mySystemName/WEB-INF/classes/core/data/
Here is the full code of the file UserAccManager.java.
package core;               //Is this right?
import data.UserPassword;     //Is this right?
import java.io.*;
import java.sql.*;
import java.util.*;
import javax.sql.*;
import javax.servlet.*;
import javax.servlet.http.*;
public final class UserAccManager{
   private static final String DRIVER = "com.mysql.jdbc.Driver";
   private static final String URL = "jdbc:mysql://localhost:3306/superfine";
   private static Connection connection;
   private static PreparedStatement pstmt1;
   private static PreparedStatement pstmt2;
   private static PreparedStatement pstmt3;
   private UserAccManager(){
   // Initializes the connection and statements
   public static void initConnection() {
      if (connection == null) {
         try {
            String sql;
            // Open the database
            Class.forName(DRIVER).newInstance();
            connection = DriverManager.getConnection(URL);
            // Prepare the statements
           sql = "SELECT * FROM UserPassword where empNo= ?";
           pstmt1 = connection.prepareStatement(sql);
            sql = "SELECT UserName FROM UserPassword where UserName= ?";
            pstmt2 = connection.prepareStatement(sql);
         sql ="INSERT INTO UserPassword VALUES(?,?,?,?)";
         pstmt3 = connection.prepareStatement(sql);
         catch (Exception ex) {
            System.err.println(ex.getMessage());
   // Closes the connection and statements
   // Method to be called by main class when finished with DB
   public void closeConnection() {
      //same as previous
   public static boolean verifyEmpno(int empno) {
      boolean emp_no_select_ok = false;
      int emp = -1;
      initConnection();
     try {
      pstmt1.setInt(1, empno);
         ResultSet rs1 = pstmt1.executeQuery();
     while(rs1.next()){
          emp=rs1.getInt("empNo");
     if(emp>0)
          emp_no_select_ok = false;
     } else{
          emp_no_select_ok = true;
        rs1.close();
     pstmt1.close();
      catch (Exception ex) {
         System.err.println(ex.getMessage());
      return emp_no_select_ok;
   public static boolean verifyUsername(String username) {
      boolean user_name_select_ok = false;
      String user = "xxxx";
      initConnection();
      try {
      pstmt2.setString(1, username);
         ResultSet rs2 = pstmt2.executeQuery();
        while(rs2.next()){
          user=rs2.getString("UserName");
           if(!user.equals("xxxx"))
          user_name_select_ok = false;
        } else{
          user_name_select_ok = true;
       rs2.close();
      catch (Exception ex) {
         System.err.println(ex.getMessage());
      return user_name_select_ok;
     public static boolean createAcc(int empno, String username, String password, int
level){
          boolean create_acc_ok = false;
          initConnection();
          try{
                  //create a new object,from the UserPassword table.
               UserPassword useraccount = new UserPassword();
               useraccount.setEmpno(empno);
               useraccount.setUsername(username);
               useraccount.setPassword(password);
               useraccount.setLevel(level);
               //assign value for ???
               pstmt3.setInt(1, useraccount.getEmpno());
               pstmt3.setString(2, useraccount.getUsername());
               pstmt3.setString(3, useraccount.getPassword());
               pstmt3.setInt(4, useraccount.getLevel());
               if(pstmt3.executeUpdate()==1) create_acc_ok=true;
               pstmt3.close();
                       //con.close();
            catch(SQLException e2){
                       System.err.println(e2.getMessage());
          return create_acc_ok;
}here is the bean (part of it)
package data;               //is it right?
import java.io.*;
import java.sql.*;
import java.util.*;
import javax.sql.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class UserPassword
     private int empno;
     private String username;
     private String password;
     private int level;
     // Constructor
     public UserPassword()
          this.empno = empno;
          this.username = username;
          this.password = password;
          this.level = level;
     // setters and getters are here.
//     public boolean verifyEmpno() {
//               return UserAccManager.verifyEmpno(empno);
//      public boolean verifyUsername(String username) {
//           return UserAccManager.verifyUsername(username);
     // These 2 methods not compile with or without para's.So I leave that job for the
     //controll class UserAccManager.java.
Now my problem is this: When I submit data, there is an error;org.apache.jasper.JasperException: Unable to compile class for JSP
An error occurred at line: -1 in the jsp file: null
Generated servlet error:
[javac] Compiling 1 source file
C:\Program Files\Apache Group\Tomcat 4.1\work\Standalone\localhost\HRM\CreateAcc_jsp.java:8:
cannot access core.data.UserPassword
bad class file: C:\Program Files\Apache Group\Tomcat
4.1\webapps\HRM\WEB-INF\classes\core\data\UserPassword.class
class file contains wrong class: data.UserPassword
Please remove or make sure it appears in the correct subdirectory of the classpath.
import core.data.UserPassword;
^
1 error
Are there any mistakes? If so tell me where is it and how to change them.Please help.

I try it that way, but it don't compile.
Error:core\data\UserPassword.java:package javax.servlet does not exist
import javax.servlet.*;
core\data\UserPassword.java:package javax.servlet.http does not exist
import javax.servlet.http.*;
So,I comment them only in the UserPassword.java file,and compile it again.
Then it compile well.I goto the directory to get the .class files.
But there is only UserPassword.class inside the data folder. There is not
UserAccManager.class in the core folder.
Then I try this way,I put my 2 java files in to a new folder,
F:\SystemName\com
When I try it that way, but it don't compile.
javac -classpath . -d . com\*.javaError:com\UserPassword.java:package javax.servlet does not exist
import javax.servlet.*;
com\UserPassword.java:package javax.servlet.http does not exist
import javax.servlet.http.*;
So,I comment them only in the UserPassword.java file,and compile it again.
Now both are compiling well.There was 2 class files.
I put them in to the WEB-INF/classes/com directory.
Start the server.But it gave errors:
C:\Program Files\Apache Group\Tomcat
4.1\work\Standalone\localhost\HRM\CreateAcc_jsp.java:68: cannot resolve symbol
symbol : variable empno
location: class org.apache.jsp.CreateAcc_jsp
if(UserPassword.verifyEmpno(empno)){
                            ^
C:\Program Files\Apache Group\Tomcat
4.1\work\Standalone\localhost\HRM\CreateAcc_jsp.java:69: cannot resolve symbol
symbol : variable username
location: class org.apache.jsp.CreateAcc_jsp
     if(UserAccManager.verifyUsername(username)){
                                         ^
C:\Program Files\Apache Group\Tomcat
4.1\work\Standalone\localhost\HRM\CreateAcc_jsp.java:69: non-static method
verifyUsername(java.lang.String) cannot be referenced from a static context
     if(UserAccManager.verifyUsername(username)){
                         ^
C:\Program Files\Apache Group\Tomcat
4.1\work\Standalone\localhost\HRM\CreateAcc_jsp.java:70: cannot resolve symbol
symbol : variable empno
location: class org.apache.jsp.CreateAcc_jsp
          if(UserAccManager.createAcc(empno, username,password,level)) nextPage
="MsgAcc.jsp";
                                            ^
C:\Program Files\Apache Group\Tomcat
4.1\work\Standalone\localhost\HRM\CreateAcc_jsp.java:70: cannot resolve symbol
symbol : variable username
location: class org.apache.jsp.CreateAcc_jsp
          if(UserAccManager.createAcc(empno, username,password,level)) nextPage
="MsgAcc.jsp";
                                                   ^
C:\Program Files\Apache Group\Tomcat
4.1\work\Standalone\localhost\HRM\CreateAcc_jsp.java:70: cannot resolve symbol
symbol : variable password
location: class org.apache.jsp.CreateAcc_jsp
          if(UserAccManager.createAcc(empno, username,password,level)) nextPage
="MsgAcc.jsp";
                                                            ^
C:\Program Files\Apache Group\Tomcat
4.1\work\Standalone\localhost\HRM\CreateAcc_jsp.java:70: cannot resolve symbol
symbol : variable level
location: class org.apache.jsp.CreateAcc_jsp
          if(UserAccManager.createAcc(empno, username,password,level)) nextPage
="MsgAcc.jsp";
                                                                     ^
C:\Program Files\Apache Group\Tomcat
4.1\work\Standalone\localhost\HRM\CreateAcc_jsp.java:70: non-static method
createAcc(int,java.lang.String,java.lang.String,int) cannot be referenced from a static
context
          if(UserAccManager.createAcc(empno, username,password,level)) nextPage
="MsgAcc.jsp";
                                 ^
8 errorsTo solve the problem non-static method,I goto the UserAccManager.java file and do these
things.
package com;
import java.io.*;
import java.sql.*;
import java.util.*;
import javax.sql.*;
//import javax.servlet.*;               //otherwise it tells an error.(package
                              //javax.servlet does not exist)
//import javax.servlet.http.*;
public class UserAccManager {
   private static final String DRIVER = "com.mysql.jdbc.Driver";
   private static final String URL = "jdbc:mysql://localhost:3306/superfine";
   private static Connection connection;
   private static PreparedStatement pstmt1;
    private static PreparedStatement pstmt2;
      private static PreparedStatement pstmt3;
   private UserAccManager() {
   // Initializes the connection and statements
   private static void initConnection() {
         //same
   // Closes the connection and statements
   // Method to be called by main class when finished with DB
   public static void closeConnection() {
     //same
   public static boolean verifyEmpno(int empno) {
      // same.
   public static boolean verifyUsername(String username) {
     //same.
     public static boolean createAcc(int empno, String username, String password, int
level){
          //same
package com;
import java.io.*;
import java.sql.*;
import java.util.*;
import javax.sql.*;
//import javax.servlet.*;
//import javax.servlet.http.*;
public class UserPassword {
     // same
Again compile those files and put .class filses into the WEB-INF/classes/com directory.
When i submits the data via the form it generates an error:
org.apache.jasper.JasperException: Unable to compile class for JSP
An error occurred at line: 9 in the jsp file: /CreateAcc.jsp
Generated servlet error:
    [javac] Compiling 1 source file
C:\Program Files\Apache Group\Tomcat
4.1\work\Standalone\localhost\HRM\CreateAcc_jsp.java:68: cannot resolve symbol
symbol : variable empno
location: class org.apache.jsp.CreateAcc_jsp
if(UserAccManager.verifyEmpno(empno)){
                              ^
An error occurred at line: 9 in the jsp file: /CreateAcc.jsp
Generated servlet error:
C:\Program Files\Apache Group\Tomcat
4.1\work\Standalone\localhost\HRM\CreateAcc_jsp.java:69: cannot resolve symbol
symbol : variable username
location: class org.apache.jsp.CreateAcc_jsp
     if(UserAccManager.verifyUsername(username)){
                                         ^
An error occurred at line: 9 in the jsp file: /CreateAcc.jsp
Generated servlet error:
C:\Program Files\Apache Group\Tomcat
4.1\work\Standalone\localhost\HRM\CreateAcc_jsp.java:70: cannot resolve symbol
symbol : variable empno
location: class org.apache.jsp.CreateAcc_jsp
          if(UserAccManager.createAcc(empno, username,password,level)) nextPage
="MsgAcc.jsp";
                                            ^
An error occurred at line: 9 in the jsp file: /CreateAcc.jsp
Generated servlet error:
C:\Program Files\Apache Group\Tomcat
4.1\work\Standalone\localhost\HRM\CreateAcc_jsp.java:70: cannot resolve symbol
symbol : variable username
location: class org.apache.jsp.CreateAcc_jsp
          if(UserAccManager.createAcc(empno, username,password,level)) nextPage
="MsgAcc.jsp";
                                                   ^
An error occurred at line: 9 in the jsp file: /CreateAcc.jsp
Generated servlet error:
C:\Program Files\Apache Group\Tomcat
4.1\work\Standalone\localhost\HRM\CreateAcc_jsp.java:70: cannot resolve symbol
symbol : variable password
location: class org.apache.jsp.CreateAcc_jsp
          if(UserAccManager.createAcc(empno, username,password,level)) nextPage
="MsgAcc.jsp";
                                                            ^
An error occurred at line: 9 in the jsp file: /CreateAcc.jsp
Generated servlet error:
C:\Program Files\Apache Group\Tomcat
4.1\work\Standalone\localhost\HRM\CreateAcc_jsp.java:70: cannot resolve symbol
symbol : variable level
location: class org.apache.jsp.CreateAcc_jsp
          if(UserAccManager.createAcc(empno, username,password,level)) nextPage
="MsgAcc.jsp";
                                                                     ^
6 errorshere is the CreateAcc.jsp file
<%@ page language="java" %>
<%@ page import="com.UserAccManager" %>
<%@ page import="com.UserPassword" %>
<jsp:useBean id="userPassword" class="com.UserPassword" scope="request"/>
<jsp:setProperty name="userPassword" property="*" />
<%
String nextPage ="MainForm.jsp";
if(UserAccManager.verifyEmpno(empno)){
     if(UserAccManager.verifyUsername(username)){
          if(UserAccManager.createAcc(empno, username,password,level)) nextPage
="MsgAcc.jsp";
      }else{
           nextPage="UserNameExist.jsp";
      else{
          nextPage="UserAccError.jsp";
%>
<jsp:forward page="<%=nextPage%>"/>Please, anyone know how to send these parameters to the java file.
Thanks.

How to download a file from server machine to client machine using jsp

Hi,
In my application, I have an excel file stored on my server machine. How can I download that excel file on to my client machine using jsp. Is there any other way I can open that file from my machine and save it in my machine using jsp/java?
Its an emergency for me to do this.
Can anyone provide me the full code to download a file from server machine as I don't have
time to browse through various sites.
thanks in advance,
Tiijnar

Please post your code using code tags (click on CODE above the text area, when posting)
response.setContentType("application/octet-stream");Why octet-stream? Set the correct mime-type.
String disHeader = "Attachment; Filename=\"filename\"";The filename should just be the file's name. Not the complete path to the file! This will tell anyone where the file is located on the server. It's also inconvenient because by default,the browser will suggest it as the name for the download.
Your way of writing to the output stream is just plain wrong. See this snippet (picked from [http://balusc.blogspot.com/2007/07/fileservlet.html])
        BufferedInputStream input = null;
        BufferedOutputStream output = null;
        try {
            // Open streams.
            input = new BufferedInputStream(new FileInputStream(file), DEFAULT_BUFFER_SIZE);
            output = new BufferedOutputStream(response.getOutputStream(), DEFAULT_BUFFER_SIZE);
            // Write file contents to response.
            byte[] buffer = new byte[DEFAULT_BUFFER_SIZE];
            int length;
            while ((length = input.read(buffer)) > 0) {
                output.write(buffer, 0, length);
            // Finalize task.
            output.flush();
        } finally {
            // Gently close streams.
            close(output);
            close(input);
        }

Use Redis Cache for Multiple Applications

Hi,
I did some searches and could not come up with a straight forward answer so I am hoping someone here can clarify this for me.
We have two different products that we have built in .NET that we host in Azure as websites. For each of these two products we have multiple clients. Each product and client pair has its own SQL database and its own website setup in Azure.
We would like to start using Redis Cache for the session of these products. Do I need to:
1) Create 1 Redis Cache and use it for all clients / products?
2) Create 2 Redis Caches and use one per product (redis caches needed = # of products)?
3) Create an individual Redis cache for each client / product pair (redis caches needed = # of products x # of clients)?

You can do either of the above. It would really depend on how much load are you expecting on the Cache
For separation and load balancing it might be better to have a Cache per Website
For a Cache to be useful it should be closer to the Web tier, so ensure that you provision the Cache in the same region as the Website.

IM client in a jsp

Dear all,
Can anyone suggest a IM client that can be called within a jsp (and then inserted within a
portlet in the IBM Websphere framework)? All the IMs I have seen seem to standalone
client/server apps, not intended for use within a jsp.
Thanks a lot!
Paul

Your looking for an IM API/framework that you can embed into a web app. Interesting concept I must admit. On a higher level IM apps are more P2P based where web apps are client/server based. There's no real reason, however, why someone couldn't embed an IM client into a web-app. At least I can't think of any limitation. I can tell you that there is no IM client that you can just drop into a web app out of the box. It's going to require some custom coding against an IM API. The alternative is to use an Applet approach which offloads the IM logic onto the client. For that you can look into Odigo. They have an IM client applet that you could drop into any HTML page.
Cliff

Error while starting the service "oracle client cache"

hello everyone,
I keep getting an error message: while i'm starting the service "oracle
client cache "
The instruction at 0x7c911e58 referenced memory at 0x00000000. The
memory
could not be read.
please help me in rectifying this error ASAP
so that i can proceed further in my work
thanks in advance

Hi
i have got the answer for this question, i updated the registry with the correct file path, and then closed the registry, the services.msc file is automatically updated with the correct path
and then started the CSService, then went to the OEM setup i clicked Retry buton, then it went through.
Thanks to all the viewers.

Control client cache for JSP

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