JDBC Bean for JSP

Any JDBC beans available for JSP? I know regular JDBC can be used but putting database connection logic in jsp sort of destroys its purpose. Are any beans in the works? Freeware/OSS beans?

Yes, we are working on some JDBC-based beans to facilitate database access. Ours is not available yet, not sure about other freeware.

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hi..im student..i need help with countdowntimer in jsp page..with java bean component..im use XHTML MP for my jsp page so i can use it in cellular phone with WAP 1..can anybody help me with this problem..thx

Tomcat 4.1 Bean error (Unable to compile class for JSP)

Help,
I am using Tomcat 4.1 with with JDK1.3.1_01. I have a JSP page in which I try to use a Bean, but I get the following error from Tomcat.
The JSP page is very simple. I am using package names in the import statement. Code below.
I've put the class files under
<TOMCAT>\webapps\projectname\WEB-INF\classes under the appropriate packages. What else is missing? I can not figure out what I am doing wrong.
***************** START JSP CODE *********************
<html>
<head>
<title>User Information</title>
</head>
<%@ page session="true" %>
<%@ page import="com.xxx.yyy.data.*" %>
<body>
<P> </P>
<P> </P>
<P> </P>

<%
     User user = (User) session.getAttribute("user");
%>
UserID = <%= user.getUserID() %><BR>
User Name = <%= user.getUserName() %><BR>
Password = <%= user.getPassword() %><BR>
Password Hint = <%= user.getPasswordHint() %><BR>
</body>
</html>
***************** END JSP CODE *********************
***************** START TOMCAT ERROR MESSAGE *********************
org.apache.jasper.JasperException: Unable to compile class for JSP
     at org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:477)
     at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:182)
     at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:289)
     at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:240)
     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:260)
     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:2397)
     at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:180)
     at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
     at org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatcherValve.java:170)
     at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:641)
     at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:171)
     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:223)
     at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:405)
     at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:380)
     at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:508)
     at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:533)
     at java.lang.Thread.run(Thread.java:536)
root cause
org.apache.jasper.JasperException: Unable to compile class for JSP
An error occurred at line: 20 in the jsp file: /userInfo.jsp
Generated servlet error:
[javac] Compiling 1 source file
D:\Apache_Group\Tomcat_4.1\work\Standalone\localhost\PALBO\userInfo_jsp.java:7: package com.xxx.yyy.data does not exist
import com.xxx.yyy.data.*;
^
D:\Apache_Group\Tomcat_4.1\work\Standalone\localhost\PALBO\userInfo_jsp.java:61: package com.xxx.yyy.data does not exist
com.xxx.yyy.data.User user = null;
^
An error occurred at line: 20 in the jsp file: /userInfo.jsp
Generated servlet error:
D:\Apache_Group\Tomcat_4.1\work\Standalone\localhost\PALBO\userInfo_jsp.java:63: package com.xxx.yyy.data does not exist
user = (com.xxx.yyy.data.User) pageContext.getAttribute("user", PageContext.SESSION_SCOPE);
^
An error occurred at line: 20 in the jsp file: /userInfo.jsp
Generated servlet error:
D:\Apache_Group\Tomcat_4.1\work\Standalone\localhost\PALBO\userInfo_jsp.java:66: package com.xxx.yyy.data does not exist
user = (com.xxx.yyy.data.User) java.beans.Beans.instantiate(this.getClass().getClassLoader(), "com.xxx.yyy.data.User");
^
An error occurred at line: 25 in the jsp file: /userInfo.jsp
Generated servlet error:
D:\Apache_Group\Tomcat_4.1\work\Standalone\localhost\PALBO\userInfo_jsp.java:77: cannot resolve symbol
symbol : class User
location: class org.apache.jsp.userInfo_jsp
     User user = (User) session.getAttribute("user");
^
An error occurred at line: 25 in the jsp file: /userInfo.jsp
Generated servlet error:
D:\Apache_Group\Tomcat_4.1\work\Standalone\localhost\PALBO\userInfo_jsp.java:77: cannot resolve symbol
symbol : class User
location: class org.apache.jsp.userInfo_jsp
     User user = (User) session.getAttribute("user");
^
6 errors
     at org.apache.jasper.compiler.DefaultErrorHandler.javacError(DefaultErrorHandler.java:120)
     at org.apache.jasper.compiler.ErrorDispatcher.javacError(ErrorDispatcher.java:293)
     at org.apache.jasper.compiler.Compiler.generateClass(Compiler.java:315)
     at org.apache.jasper.compiler.Compiler.compile(Compiler.java:326)
     at org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:474)
     at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:182)
     at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:289)
     at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:240)
     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:260)
     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:2397)
     at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:180)
     at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
     at org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatcherValve.java:170)
     at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:641)
     at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:171)
     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:223)
     at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:405)
     at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:380)
     at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:508)
     at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:533)
     at java.lang.Thread.run(Thread.java:536)
***************** END TOMCAT ERROR MESSAGE *********************

Hi
I am running my Tomcat apps (on a Windows dev machine) in an alternate location (ie. not default webapps). The same crap comes to me every time. Unable to install etc. I have tried every trick in the book regarding classpath settings etc.
When I use 'javap' to check the classpath from any location on my machine, its works and javap returns the signature of my class.
When I use it though Tomcat (with the import set to include the filename), it get the error. I have heard rumors that using JDK 1.3 in stead of 1.4 helps, but I just want it to work with 1.4 :)
So if any of you can help me on this, please.
PS. On my linux server it works just fine, as does every other thing on that machine ;)
Chris (chris.schuit <at> euronet.nl)

Using JSP & JDBC driver for SQL Server 2000 on Red Hat

I successfully have a .jsp app running on windows server 2000 using JDBC
driver for SQL Server 2000. Which I installed in order to the following
Red Hat:
http://msdn.microsoft.com/MSDN-FILES/027/001/779/install.htm
I moved the .jsp app over to the Red Hat 9 server running Tomcat, while
keeping the MS SQL 2000 on windows. The issue I have is setting up the
JDBC driver for SQL Server 2000 on the Red Hat server.
I created a folder called /usr/java/MSSQLdriver and unzipped the tar file with
the driver for SQL Server 2000. And ran the install.ksh script.
The /usr/java/MSSQLdriver/lib has the following files within it:
msbase.jar, msutil.jar, & mssqlserver.jar
I chmod 0777 each of the *.jar files.
I then went into /etc/profile.d/tomcat.sh and adding the following:
CLASSPATH=.;/opt/msSQLjdbc/lib/msbase.jar;/opt/msSQLjdbc/lib/msutil.jar;/opt/msSQLjdbc/lib/mssqlserver.jar
Each time I login and pull up the termial I get the following error:
bash: /opt/msSQLjdbc/lib/msbase.jar: cannot execute binary file
bash: /opt/msSQLjdbc/lib/msutil.jar: cannot execute binary file
bash: /opt/msSQLjdbc/lib/mssqlserver.jar: cannot execute binary file
And can't connnect to the database within the .jsp app.
Is there anyone out there using DBC driver for SQL Server 2000 on the Red Hat server?
Michael

Sorry, I needed to correct some information of where the drivers were installed.
I created a folder called /usr/java/MSSQLdriver/new and untar the Microsoft file with the driver for SQL Server 2000. I ran the install.ksh script "sh install.ksh"
installed the driver into the default directory "/opt/msSQLjdbc".
The /opt/msSQLjdbc/lib has the following files within it:
msbase.jar, msutil.jar, & mssqlserver.jar
Michael

JDBC with MS Access for JSP

Hi,
I am facing a problem connecting to a MS Access file with JDBC in a JSP file.
I spent a whole day and simplified my code. But, I can�t still figure it out.
1. Environment: Windows XP, Tomcat 5.5, MS Access 2003
2. I set up the ODBC data sources in the control panel.
Please, check my code and error messages.
Also, do I have to modify the sever.xml file?
Do I need to make a jar file and put it into TOMCAT/config/lib ?
If yes, I would appreciate it if you let me know how to do it.
Thanks.
HY
++++++++++++++ CODE ++++++++++++++++++++++++++++++++
<%@ page language = "java" session = "true" %>
<%@ page import="java.sql.*" %>
<%
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
Connection con = DriverManager.getConnection("jdbc:odbc:TestJSP", "", "");
Statement stmt = con.createStatement();
ResultSet rs = stmt.executeQuery("SELECT * FROM Login;");
%>
++++++++++++++ ERROR MESSAGE +++++++++++++++++++++++++++++++
exception
javax.servlet.ServletException: [Microsoft][ODBC Driver Manager] Data source name not found and no default driver specified
     org.apache.jasper.runtime.PageContextImpl.doHandlePageException(PageContextImpl.java:846)
     org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:779)
     org.apache.jsp.check_jsp._jspService(org.apache.jsp.check_jsp:65)
     org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:99)
     javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
     org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:325)
     org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:291)
     org.apache.jasper.servlet.JspServlet.service(JspServlet.java:241)
     javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
root cause
java.sql.SQLException: [Microsoft][ODBC Driver Manager] Data source name not found and no default driver specified
     sun.jdbc.odbc.JdbcOdbc.createSQLException(Unknown Source)
     sun.jdbc.odbc.JdbcOdbc.standardError(Unknown Source)
     sun.jdbc.odbc.JdbcOdbc.SQLDriverConnect(Unknown Source)
     sun.jdbc.odbc.JdbcOdbcConnection.initialize(Unknown Source)
     sun.jdbc.odbc.JdbcOdbcDriver.connect(Unknown Source)
     java.sql.DriverManager.getConnection(Unknown Source)
     java.sql.DriverManager.getConnection(Unknown Source)
     org.apache.jsp.check_jsp._jspService(org.apache.jsp.check_jsp:54)
     org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:99)
     javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
     org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:325)
     org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:291)
     org.apache.jasper.servlet.JspServlet.service(JspServlet.java:241)
     javax.servlet.http.HttpServlet.service(HttpServlet.java:802)

I am trying to connect to access file through servlets. I am using odbc-jdbc Bridge. It is working when I am using application instead of servlet. But when I am trying to do it by servlet the following error is shown.
Data source name is not found and no default driver is specified.
But after using system DNS instead of user DNS I am getting new error.
General error
My code for connection :
import java.io.*;
import java.util.Enumeration;
import javax.servlet.*;
import javax.servlet.http.*;
import java.sql.*;
import java.net.*;
public class emaildb extends HttpServlet{
     Connection theConnection;
     private ServletConfig config;
     public void init(ServletConfig config)
          throws ServletException{
          this.config=config;
public void service (HttpServletRequest req, HttpServletResponse res)
      throws ServletException, IOException {
       HttpSession session = req.getSession(true);
       res.setContentType("text/html");
       PrintWriter out = res.getWriter();
       out.println("<HTML><HEAD><TITLE>Emai List.</TITLE>");
       out.println("</HEAD>");
       out.println("<BODY bgColor=blanchedalmond text=#008000 topMargin=0>");
        out.println("<P align=center><FONT face=Helvetica><FONT color=fuchsia style=\"BACKGROUND-COLOR: white\"><BIG><BIG>List of E-mail addresses.</BIG></BIG></FONT></P>");
       out.println("<P align=center>");
        out.println("<TABLE align=center border=1 cellPadding=1 cellSpacing=1 width=\"75%\">");
        out.println("<TR>");
        out.println("<TD>Name</TD>");
        out.println("<TD>E-mail</TD>");
        out.println("<TD>Website</TD></TR>");
     try{
            Class.forName("sun.jdbc.odbc.JdbcOdbcDriver").newInstance();//Loading Sun's JDBC ODBC Driver
            theConnection = DriverManager.getConnection("jdbc:odbc:emaildb","admin",""); //Connect to emaildb Data source
          Statement theStatement=theConnection.createStatement();
           ResultSet theResult=theStatement.executeQuery("select * from emaillists"); //Select all records from emaillists table.
          while(theResult.next()) //Fetch all the records and print in table
             out.println();
                   out.println("<TR>");
                   out.println("<TD>" + theResult.getString(1) + "</TD>");
                   out.println("<TD>" + theResult.getString(2) + "</TD>");
               String s=theResult.getString(3);
                   out.println("<TD><a href=" + s + ">" + s + "</a></TD>");
                   out.println("</TR>");
            theResult.close();//Close the result set
            theStatement.close();//Close statement
            theConnection.close(); //Close database Connection
          }catch(Exception e){
          out.println(e.getMessage());//Print trapped error.
       out.println("</TABLE></P>");
       out.println("<P>�</P></FONT></BODY></HTML>");
     public void destroy(){
how can I solve it?. I am using tomcat 5.0.30 and jdk 1.5. there is no problem to run the servlet. And it is office xp.
Message was edited by:
        java24

Please recommend IDE for JSP and Beans

Hi guys,
I am looking for a decent IDE to work with JSP and Beans. I have tried JBuilder which has too much going on at the same time and I find it to be an overkill for what I am doing; I find NetBeans kind of irritating. I develop web applications, hence I dont need any GUI stuff for beans.
Just looking for something that will enable me to rapidly develop beans as a support system for JSP pages and at the same time, it should provide good support for coding JSP pages. Little bit of management functions wont hurt either, but are not required. I dont mind if I have to pay for the IDE. Any recommendations?

I like Eclipse for Java Development, and I use the MyEclipse plug-in for J2EE development.
There is a free J2EE plug-in (Lomboz) but I'd much rather pay the $29.99/year for MyEclipse. It's been perfect for me.

Can anyone give me a bean for JAVAMAIL in JSP?

Can anyone give me a bean for JAVAMAIL in JSP?
I'd like to use a bean instead of writing a complete jsp page for each of my send mail options!!

Have a look in the javaMail forum, youll find code for a class in there without too much trouble.

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.

Problem while creating instance of bean in jsp

have created a bean ConnBean in package ask. I am using apache tomcat 4.0.1 as a web server.
The ask folder is in webapps/WEB-INF/classes as well as in webapps/Root/WEB_INF/classes and in ask folder ConnBean.class is stored.
Url for jsp is webapps/Root/jdbc.jsp
In jsp file the tag used is <jsp.useBean id="conn" class="ask.ConnBean" />
when jsp is executed web server shows error as following
Apache Tomcat/4.0.1 - HTTP Status 500 - Internal Server Error
type Exception report
message Internal Server Error
description The server encountered an internal error (Internal Server Error) that prevented it from fulfilling this request.
exception
org.apache.jasper.JasperException: Unable to compile class for JSP
An error occurred at line: 10 in the jsp file: /jdbc.jsp
Generated servlet error:
C:\Program Files\Apache Tomcat 4.0\work\localhost\_\jdbc$jsp.java:75: Class ask.ConnBean not found.
ask.ConnBean conn = null;
^
An error occurred at line: 10 in the jsp file: /jdbc.jsp
Generated servlet error:
C:\Program Files\Apache Tomcat 4.0\work\localhost\_\jdbc$jsp.java:78: Class ask.ConnBean not found.
conn= (ask.ConnBean)
^
An error occurred at line: 10 in the jsp file: /jdbc.jsp
Generated servlet error:
C:\Program Files\Apache Tomcat 4.0\work\localhost\_\jdbc$jsp.java:83: Class ask.ConnBean not found.
conn = (ask.ConnBean) java.beans.Beans.instantiate(this.getClass().getClassLoader(), "ask.ConnBean");
^
3 errors
at org.apache.jasper.compiler.Compiler.compile(Compiler.java:284)
at org.apache.jasper.servlet.JspServlet.loadJSP(JspServlet.java:546)
at org.apache.jasper.servlet.JspServlet$JspServletWrapper.loadIfNecessary(JspServlet.java:177)
at org.apache.jasper.servlet.JspServlet$JspServletWrapper.service(JspServlet.java:189)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:382)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:474)
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:243)
at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:201)
at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)
at org.apache.catalina.core.StandardContext.invoke(StandardContext.java:2344)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:164)
at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)
at org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatcherValve.java:170)
at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:564)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:170)
at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:564)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:462)
at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:564)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:163)
at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)
at org.apache.catalina.connector.http.HttpProcessor.process(HttpProcessor.java:1011)
at org.apache.catalina.connector.http.HttpProcessor.run(HttpProcessor.java:1106)
at java.lang.Thread.run(Unknown Source)

have created a bean ConnBean in package ask. I am
using apache tomcat 4.0.1 as a web server.
The ask folder is in webapps/WEB-INF/classes Remove it. This will just cloud the issue.
as well
as in webapps/Root/WEB_INF/classes and in ask folderThat should be webapps/ROOT/WEB-INF/classes
ConnBean.class is stored.
Url for jsp is webapps/Root/jdbc.jspwebapps/ROOT/jdbc.jsp
>
In jsp file the tag used is <jsp.useBean id="conn"
class="ask.ConnBean" />After making the above changes, see if the error still occurs. Does your ConnBean have a public no args constructor?

Calling Java Bean From JSP

<%@ page contentType="text/html;charset=windows-1252" errorPage = "error.jsp"%>
<%@ page import="java.sql.*,java.io.*,javax.sql.*, mypackage1.*"%>
<html>
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=windows-1252">
    <title>Process</title>
</head>
<body>
      <P align="center">
        <STRONG><FONT face="Algerian" size="6" color="#0033cc">Result from the Query</FONT></STRONG>
      </P>
      <P align="center"> </P>
      <P align="center"> </P>
      <P align="center"> </P>
      <P align="center"> </P>
      <P align="center">
   <%
        int rowsChanged;
        Connection con;
        try
          String sql;
          sql = request.getParameter("query");
          System.out.println(sql);
          session=request.getSession(true);
          String name = (String)session.getAttribute("theID");
          String password = (String)session.getAttribute("paswd");
          String driver="oracle.jdbc.OracleDriver";
          Class.forName(driver);
          String url ="jdbc:oracle:thin:@minerva.humber.ca:1521:grok" ;
          con = DriverManager.getConnection(url,name,password);
          if(sql.substring(0,6).equalsIgnoreCase("Select"))
              Statement stat = con.createStatement();
                 ResultSet rs = stat.executeQuery(sql);
      %>
     <jsp:useBean id="myBean" scope="page" class="mypackage1.Table" >
           </jsp:useBean>
         <jsp:setProperty name="myBean" property="*" param="<%rs%>"/>
      <%
        myBean.setTable(rs);
        out.println(myBean.getTable());
     %>
      <%
       else
          Statement stat = con.createStatement();
          rowsChanged = stat.executeUpdate(sql);
          out.println("<h3><STRONG><FONT face=Algerian size=5 color=#0033cc>Number of rows affected are: "+rowsChanged+"</h3></Strong></Font>");
       }//End of Try
       catch(Exception e)
          System.out.println(e+ "gd"+ e.getMessage());
      %>
      </P>
        <P align="center">
        <a href="check.jsp">Please Click Here to Return to Main Page</a>
      </P>
</body>
</html>Above is my JSP file, which is calling a Java bean class called Table. The thing is that Its not returning any Table from the Table Class. I dont know how to use Java bean as I m new to it. Following is my Table Class. So If anyone can plz help me then it would be great. I m suffering from 2 days just because of this class and JSP.
package mypackage1;
import java.io.Serializable;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
public class Table implements Serializable
private ResultSet rs;
public Table()
public void setTable(ResultSet result)
    rs = result;
public String getTable()
         String output=null;
         try
                ResultSetMetaData metadata;
                metadata=rs.getMetaData();
     // find the number of fields in customer table
                int col=metadata.getColumnCount();
                output = "<table/><tr/>";
                for(int i=1;i<=col;i++)
                    output+="<td/><b/>"+metadata.getColumnName(i)+"</b/></td/>";
                output += "</tr/>";
                while (rs.next())
                       output="<tr/>";
                       for(int i=1;i<=col;i++)
                         output+="<td/>"+rs.getString(i)+"</td/>";
                       output += "</tr/></table/>";
                }//End of While
           catch(Exception e)
    return output;
}//End of Table method
}//End of Class

First reaction: yuck.
This is not something you should be using a bean for.
Beans are meant for storing data, not for generating HTML from.
I don't really like queries on a JSP page either, but thats a different story again.
I would recommend you use JSTL for this.
1 - it provides a c:forEach tag for looping
2 - it provides sql tags for doing queries in a database
IF you are going to do database queries from a JSP page, I absolutely recommend you use the JSTL tags.
(end rant)
Your problem is probably caused by the fact that in your bean you have the following
try{
// code here
catch (Exception e){
// completely ignore exception and carry on as if nothing bad happened.
// what you should be doing is something like:
System.out.println("Error occurred " + e.getMessage());
e.printStackTrace();
return e.getMessage();
}Cheers,
evnafets

Using beans with jsp

Hi
i am using tomcat 6.0 and jdk 1.6u17
i am trying to use a bean to connect to MySql db using jsp page but i keep getting the error :
org.apache.jasper.JasperException: org.apache.jasper.JasperException: Unable to load class for JSP
i read about it and i think that it is unable to locate my bean class file
here is the beanDb.java
package beans;
import java.sql.;
import java.io.;
public class beanDb
private Connection dbCon;
String path="jdbc:mysql://localhost:3306/dbname?user=username&password=pwd";
String dbDriver="com.mysql.jdbc.Driver";
public beanDb()
super();
public boolean connect() throws ClassNotFoundException,SQLException
Class.forName(dbDriver);
dbCon = DriverManager.getConnection(path);
return true;
public void close() throws SQLException
dbCon.close();
public void path()
public ResultSet execSQL(String sql) throws SQLException
Statement s = dbCon.createStatement();
ResultSet r = s.executeQuery(sql);
return (r == null) ? null : r;
public int updateSQL(String sql) throws SQLException
Statement s = dbCon.createStatement();
int r = s.executeUpdate(sql);
return (r == 0) ? 0 : r;
and the jsptest.jsp code is :
<%@ page contentType="text/html; charset=iso-8859-1" language="java" import="java.sql.*" errorPage="" %>
<jsp:useBean id="beanDb" class="beanDb" scope="request" />
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<title>Untitled Document</title>
</head>
<body>
<%
out.println(beanDb.connect());
%>
</body>
</html>
the location of these files are :
C:\Program Files\Apache Software Foundation\Tomcat 6.0\webapps\myApp\WEB-INF\classes\beans\beanDb.java
C:\Program Files\Apache Software Foundation\Tomcat 6.0\webapps\myApp\jsptest.jsp
Please suggest a solution..
Thanks

http://forums.sun.com/thread.jspa?threadID=5423314

Using beans with jsp without any ide

Hi
i am using tomcat 6.0 and jdk 1.6u17
i am trying to use a bean to connect to MySql db using jsp page but i keep getting the error :
org.apache.jasper.JasperException: org.apache.jasper.JasperException: Unable to load class for JSP
i read about it and i think that it is unable to locate my bean class file
here is the beanDb.java
package beans;
import java.sql.*;
import java.io.*;
public class beanDb
     private Connection dbCon;
     String path="jdbc:mysql://localhost:3306/dbname?user=username&password=pwd";
     String dbDriver="com.mysql.jdbc.Driver";
     public beanDb()
          super();
     public boolean connect() throws ClassNotFoundException,SQLException
Class.forName(dbDriver);
dbCon = DriverManager.getConnection(path);
return true;
     public void close() throws SQLException
     dbCon.close();
     public void path()
     public ResultSet execSQL(String sql) throws SQLException
          Statement s = dbCon.createStatement();
ResultSet r = s.executeQuery(sql);
return (r == null) ? null : r;
     public int updateSQL(String sql) throws SQLException
     Statement s = dbCon.createStatement();
int r = s.executeUpdate(sql);
return (r == 0) ? 0 : r;
and the jsptest.jsp code is :
<%@ page contentType="text/html; charset=iso-8859-1" language="java" import="java.sql.*" errorPage="" %>
<jsp:useBean id="beanDb" class="beanDb" scope="request" />
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<title>Untitled Document</title>
</head>
<body>
<%
               out.println(beanDb.connect());
               Connection connection;
               Statement stmt = null;
               ResultSet rs = null;
%>
</body>
</html>
the location of these files are :
C:\Program Files\Apache Software Foundation\Tomcat 6.0\webapps\ROOT\myApp\WEB-INF\classes\beans\beanDb.java
C:\Program Files\Apache Software Foundation\Tomcat 6.0\webapps\ROOT\myApp\jsptest.jsp
Please suggest a solution..
Thanks

here is the changed code but still the same error:
package beans;
import java.sql.;
import java.io.;
public class beanDb
private Connection dbCon;
String path="jdbc:mysql://localhost:3306/dbname?user=username&password=pwd";
String dbDriver="com.mysql.jdbc.Driver";
public beanDb()
super();
public boolean connect() throws ClassNotFoundException,SQLException
Class.forName(dbDriver);
dbCon = DriverManager.getConnection(path);
return true;
public void close() throws SQLException
dbCon.close();
public void path()
public ResultSet execSQL(String sql) throws SQLException
Statement s = dbCon.createStatement();
ResultSet r = s.executeQuery(sql);
return (r == null) ? null : r;
public int updateSQL(String sql) throws SQLException
Statement s = dbCon.createStatement();
int r = s.executeUpdate(sql);
return (r == 0) ? 0 : r;
and the jsptest.jsp code is :
<%@ page contentType="text/html; charset=iso-8859-1" language="java" import="java.sql.*" errorPage="" %>
<jsp:useBean id="beanDb" class="beanDb" scope="request" />
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<title>Untitled Document</title>
</head>
<body>
<%
out.println(beanDb.connect());
%>
</body>
</html>
the location of these files are :
C:\Program Files\Apache Software Foundation\Tomcat 6.0\webapps\myApp\WEB-INF\classes\beans\beanDb.java
C:\Program Files\Apache Software Foundation\Tomcat 6.0\webapps\myApp\jsptest.jsp

Cannot obtain an appropriate JDBC type for class char.

The above error while deploying...The full error is below. The only datatypes used are: integer, timestamp,string, decimal and date (so no char). Can anybody help?
Caught exception during application deployment from SAP J2EE Engine's deploy service:
java.rmi.RemoteException: Cannot deploy application sap.com/SAPAS12013.. Reason: Cannot obtain an appropriate JDBC type for class char. To store the field with this class in the database, the class must implement java.io.Serializable.; nested exception is: com.sap.engine.services.deploy.container.DeploymentException: <--Localization failed: ResourceBundle='com.sap.engine.services.deploy.DeployResourceBundle', ID='com.sap.engine.services.ejb.exceptions.deployment.EJBDeploymentException: Cannot obtain an appropriate JDBC type for class char. To store the field with this class in the database, the class must implement java.io.Serializable.
at com.sap.engine.services.ejb.deploy.tools.sql.Mappings.getDefaultSqlTypeForJavaType(Mappings.java:131)
at com.sap.engine.services.ejb.deploy.xml.CMPParser.fillCmpFieldInfo(CMPParser.java:89)
at com.sap.engine.services.ejb.deploy.xml.CMPParser.parseCMPFields(CMPParser.java:644)
at com.sap.engine.services.ejb.deploy.xml.CMPParser.parseFields(CMPParser.java:121)
at com.sap.engine.services.ejb.deploy.xml.EJBJarParser.parseXml(EJBJarParser.java:173)
at com.sap.engine.services.ejb.deploy.xml.EJBJarParser.parseXml(EJBJarParser.java:97)
at com.sap.engine.services.ejb.deploy.DeployAdmin.parseSingleJar(DeployAdmin.java:296)
at com.sap.engine.services.ejb.deploy.DeployAdmin.generate(DeployAdmin.java:246)
at com.sap.engine.services.ejb.EJBAdmin.deploy(EJBAdmin.java:2118)
at com.sap.engine.services.deploy.server.application.DeploymentTransaction.makeComponents(DeploymentTransaction.java:594)
at com.sap.engine.services.deploy.server.application.DeployUtilTransaction.commonBegin(DeployUtilTransaction.java:379)
at com.sap.engine.services.deploy.server.application.DeploymentTransaction.begin(DeploymentTransaction.java:296)
at com.sap.engine.services.deploy.server.application.ApplicationTransaction.makeAllPhasesOnOneServer(ApplicationTransaction.java:290)
at com.sap.engine.services.deploy.server.application.ApplicationTransaction.makeAllPhases(ApplicationTransaction.java:323)
at com.sap.engine.services.deploy.server.DeployServiceImpl.makeGlobalTransaction(DeployServiceImpl.java:3033)
at com.sap.engine.services.deploy.server.DeployServiceImpl.deploy(DeployServiceImpl.java:463)
at com.sap.engine.services.deploy.server.DeployServiceImplp4_Skel.dispatch(DeployServiceImplp4_Skel.java:1555)
at com.sap.engine.services.rmi_p4.DispatchImpl._runInternal(DispatchImpl.java:294)
at com.sap.engine.services.rmi_p4.DispatchImpl._run(DispatchImpl.java:183)
at com.sap.engine.services.rmi_p4.server.P4SessionProcessor.request(P4SessionProcessor.java:119)
at com.sap.engine.core.service630.context.cluster.session.ApplicationSessionMessageListener.process(ApplicationSessionMessageListener.java:37)
at com.sap.engine.core.cluster.impl6.session.UnorderedChannel$MessageRunner.run(UnorderedChannel.java:71)
at com.sap.engine.core.thread.impl3.ActionObject.run(ActionObject.java:37)
at java.security.AccessController.doPrivileged(Native Method)
at com.sap.engine.core.thread.impl3.SingleThread.execute(SingleThread.java:94)
at com.sap.engine.core.thread.impl3.SingleThread.run(SingleThread.java:162)

Hi Ashley,
And yet, apparently you have a cmp-field with type <b>char</b> in one of your CMP entity beans. This is not supported. Please refer to the <a href="http://help.sap.com/saphelp_nw04/helpdata/en/13/dbb2b66146934a9662918755038ea1/frameset.htm">Object/Relational Mapping Rules</a> and especially to the first bullet under the table.
Hope that helps!
Vladimir

What is the difference between java direct or java bean in JSP?

What is the difference if I use java code directly in JSP or use java bean in JSP?
Which class to use for receiving the passed parameter from html or java script? Any difference for java code and java bean in the way receiving the passed data?
How can I pass string from jsp to html or java script?

it's generally accepted as better design to separate presentation from logic. meaning, the java code in the jsp should be used to support displaying data, as oppsoed to implementing the application - like database access, etc.
when the logic is separated from the presentation, it allows you to reuse logic components within several jsp pages.
if you decide to change the presentation layer in the future (to support wap, for example) you don't need to rewrite your entire application, since the "guts" of the application is outside of the jsps.
it is also a good idea to separate your business logic from your data layer. adding a "buffer zone" between these layers helps in the same manner as in separating presentation from logic. if you're using flat files for storage now, upgrading to a database wouldn't require rewriting all your business logic, just the methods which write out the data to a file, for example.
once you feel comfortable with separating the various layers, check out the struts framework at http://jakarta.apache.org/
to answer your second question, to get parameters passed in from HTML forms, use ServletRequet's getParameter() method.
in tomcat:
<% String lastName = request.getParameter( "lastname" ); %>
to answer your third question: when displaying the HTML from withing a jsp, print out the string to a javascript variable or a hidden form element:
<% String firstName = "mike"; %>
<input type="hidden" name="firstname" value="<%= firstName %>">
<script language="javascript1.2">
var firstName = "<%= firstName %>";
</script>
this jsp results in the following html:
<input type="hidden" name="firstname" value="mike">
<script language="javascript1.2">
var firstName = "mike";
</script>

Problem with java beans and jsp on web logic 6.0 sp1

          HI ,
          I am using weblogic6.0 sp1.
          i have problem with jsp and java beans.
          i am using very simple java bean which stores name and email
          from a html form.
          but i am getting following errors:
          Full compiler error(s):
          D:\bea4\wlserver6.0sp1\config\mydomain\applications\DefaultWebApp_myserver\WEB-INF\_tmp_war_myserver_myserver_DefaultWebApp_myserver\jsp_servlet\_savename2.java:89:
          cannot resolve symbol
          symbol : class userbn
          location: class jsp_servlet._savename2
          userbn ud = (userbn) //[ /SaveName2.jsp; Line: 7]
          ^
          D:\bea4\wlserver6.0sp1\config\mydomain\applications\DefaultWebApp_myserver\WEB-INF\_tmp_war_myserver_myserver_DefaultWebApp_myserver\jsp_servlet\_savename2.java:89:
          cannot resolve symbol
          symbol : class userbn
          location: class jsp_servlet._savename2
          userbn ud = (userbn) //[ /SaveName2.jsp; Line: 7]
          ^
          D:\bea4\wlserver6.0sp1\config\mydomain\applications\DefaultWebApp_myserver\WEB-INF\_tmp_war_myserver_myserver_DefaultWebApp_myserver\jsp_servlet\_savename2.java:94:
          cannot resolve symbol
          symbol : class userbn
          location: class jsp_servlet._savename2
          ud = (userbn) java.beans.Beans.instantiate(getClass().getClassLoader(),
          "userbn"); //[ /SaveName2.jsp; Line: 7]
          ^
          3 errors
          in which directory should i place java bean source file(.java file)
          here is my jsp file:
          <%@ page language = "java" contentType = "text/html" %>
          <html>
          <head>
          <title>bean2</title>
          </head>
          <body>
          <jsp:usebean id = "ud" class = "userbn" >
          <jsp:setProperty name = "ud" property = "*" />
          </jsp:usebean>
          <ul>
          <li> name: <jsp:getProperty name = "ud" property = "name" />
          <li> email : <jsp:getProperty name = "ud" property = "email" />
          </ul>
          </body>
          <html>
          here is my bean :
          ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
          import java.io.*;
          public class userbn implements Serializable
               private String name ;
               private String email;
               public void setName(String n)
                    name = n;
               public void setEmail(String e)
                    email = e;
               public String getName()
                    return name;
               public String getEmail()
                    return email;
               public userbn(){}
          ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
          pls help me.
          Thanks
          sravana.


          You realy can do it like Xiang says, but the better way is to use packages. That's
          the way BEA is designed for. If you use packages you can but your bean classes
          in every subfolder beneath Classes. Here for example we have the subfolders test
          and beans:
          You have to declare the package on top of your Bean Source Code:
          package test.beans;
          In your JSP you don't need the import code of Xiang. You only have to refer the
          path of your bean class:
          <jsp:useBean id="testBean" scope="session" class="test.beans.TestBean" />
          There are some other AppServers that only can deploy Java Beans in packages. So
          if you use packages you are always on the right side.
          ciao bernd
          "sravana" <[email protected]> wrote:
          >
          >Thank you very much Xiang Rao, It worked fine.
          >Thanks again
          >sravana.
          >
          >"Xiang Rao" <[email protected]> wrote:
          >>
          >><%@ page import="userbn" language = "java" contentType = "text/html"
          >>%> should
          >>work for you.
          >>
          >>
          >>"sravana" <[email protected]> wrote:
          >>>
          >>>HI ,
          >>>
          >>>I am using weblogic6.0 sp1.
          >>>
          >>>i have problem with jsp and java beans.
          >>>
          >>>i am using very simple java bean which stores name and email
          >>>
          >>>from a html form.
          >>>
          >>>but i am getting following errors:
          >>>
          >>>________________________________________________________________
          >>>
          >>>Full compiler error(s):
          >>>D:\bea4\wlserver6.0sp1\config\mydomain\applications\DefaultWebApp_myserver\WEB-INF\_tmp_war_myserver_myserver_DefaultWebApp_myserver\jsp_servlet\_savename2.java:89:
          >>>cannot resolve symbol
          >>>symbol : class userbn
          >>>location: class jsp_servlet._savename2
          >>> userbn ud = (userbn) //[ /SaveName2.jsp; Line: 7]
          >>> ^
          >>>D:\bea4\wlserver6.0sp1\config\mydomain\applications\DefaultWebApp_myserver\WEB-INF\_tmp_war_myserver_myserver_DefaultWebApp_myserver\jsp_servlet\_savename2.java:89:
          >>>cannot resolve symbol
          >>>symbol : class userbn
          >>>location: class jsp_servlet._savename2
          >>> userbn ud = (userbn) //[ /SaveName2.jsp; Line: 7]
          >>> ^
          >>>D:\bea4\wlserver6.0sp1\config\mydomain\applications\DefaultWebApp_myserver\WEB-INF\_tmp_war_myserver_myserver_DefaultWebApp_myserver\jsp_servlet\_savename2.java:94:
          >>>cannot resolve symbol
          >>>symbol : class userbn
          >>>location: class jsp_servlet._savename2
          >>> ud = (userbn) java.beans.Beans.instantiate(getClass().getClassLoader(),
          >>>"userbn"); //[ /SaveName2.jsp; Line: 7]
          >>> ^
          >>>3 errors
          >>>
          >>>____________________________________________________________
          >>>
          >>>in which directory should i place java bean source file(.java file)
          >>>
          >>>here is my jsp file:
          >>>--------------------------------------------------------
          >>>
          >>><%@ page language = "java" contentType = "text/html" %>
          >>><html>
          >>><head>
          >>><title>bean2</title>
          >>></head>
          >>><body>
          >>><jsp:usebean id = "ud" class = "userbn" >
          >>><jsp:setProperty name = "ud" property = "*" />
          >>></jsp:usebean>
          >>><ul>
          >>><li> name: <jsp:getProperty name = "ud" property = "name" />
          >>><li> email : <jsp:getProperty name = "ud" property = "email" />
          >>></ul>
          >>></body>
          >>><html>
          >>>
          >>>-------------------------------------------------------------
          >>>
          >>>here is my bean :
          >>>
          >>>~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
          >>>
          >>>import java.io.*;
          >>>
          >>>public class userbn implements Serializable
          >>>{
          >>>
          >>>     private String name ;
          >>>
          >>>     private String email;
          >>>
          >>>     public void setName(String n)
          >>>     {
          >>>
          >>>          name = n;
          >>>     }
          >>>
          >>>     public void setEmail(String e)
          >>>     {
          >>>
          >>>          email = e;
          >>>     }
          >>>
          >>>     public String getName()
          >>>     {
          >>>
          >>>          return name;
          >>>     }
          >>>
          >>>     public String getEmail()
          >>>     {
          >>>
          >>>          return email;
          >>>     }
          >>>
          >>>     public userbn(){}
          >>>}
          >>>~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
          >>>
          >>>pls help me.
          >>>Thanks
          >>>sravana.
          >>>
          >>
          >

JDBC Bean for JSP

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