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Servlet connection with Jdbc

 
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Hi,
The following program is servlet with Jdbc connection.
Iam using oracle 9i as databse.
There are no errors while compiling.
When i run on tomcat server
http://localhost/servlet/servletwithjdbc
iam not getting any thing on explorer.
Iam getting empty page.
How can i run this program to get results.
Program:

import java.io.*;
import java.sql.*;
import javax.servlet.ServletException;
import java.lang.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
import java.sql.*;
public class servletwithjdbc extends HttpServlet {

public void doGet(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
PrintWriter out=null;
Connection con=null;
con=connect();
Statement stmt=null;
ResultSet rs=null;
resp.setContentType("text/html");
out=resp.getWriter();
try
{
stmt=con.createStatement();
rs=stmt.executeQuery("select ename,job from scott.emp ");
out.println("<HTML><HEAD><TITLE>EMPDETAILS</TITLE><HEAD>");
out.println("<BODY>");

out.println("<UL>");
while(rs.next())
{
out.println("<L1>"+rs.getString("ename")+" "+rs.getString("job"));
}
out.println("</UL>");
out.println("</BODY></HTML>");



System.out.println("end iof listing");
}
catch(Exception e)
{
System.err.println("Exception:"+e.getMessage());

}
finally{
try
{
if(con!=null)
con.close();
}
catch(SQLException e)
{ }
}
}
protected static Connection connect()
{
String userID="SCOTT";
String password="TIGER";
Connection con=null;
String url="jdbc racle:thin:@localhost:1521:bachi";
try
{


Class.forName("oracle.jdbc.driver.OracleDriver");
con=DriverManager.getConnection(url,userID,password);
}
catch (Exception e)
{
System.err.println("Ecception: "+e.getMessage());
}
return con;
}
}
Thanks for your help.
--Lakshmi
 
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Posts: 672
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Did you see any messages printed in your console?
[ February 18, 2004: Message edited by: Bruce Jin ]
 
Lakshmi siri
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Hi,
Where should i check the console.
--Lakshmi
 
Bruce Jin
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when you start Tomcat you have a dos window opened. Check there.
In case you run it as service and don't have a window, check Tomcat log files.
 
Lakshmi siri
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Hi,
In console i saw the following error.
Exception: oracle.jdbc.driver.OracleDriver
Exception: null
do i need to write any classpath?
Thanks for your help.
--Lakshmi
 
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Welcome to the Ranch "lakshmi"!
You'll find this forum a great place to seek help on servlets, and there aren't many rules you'll have to worry about, but one is that proper names are required. Please take a look at the JavaRanch Naming Policy and change your display name to match it.
In particular, your display name must be a first and a last name separated by a space character, and must not be obviously fictitious.
Thanks!
bear
Forum Bartender
 
Bruce Jin
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To pin down the error, add e.printStackTrace() in try/catch.
 
Lakshmi siri
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Hi,
i add e.getStackTrace in the catch block
catch(SQLException e)
{
e.getStackTrace();
}
I got the following message on explorer.

type Exception report
message
description The server encountered an internal error () that prevented it from fulfilling this request.
exception
java.lang.NullPointerException
servletwithjdbc.doGet(servletwithjdbc.java:32)
javax.servlet.http.HttpServlet.service(HttpServlet.java:743)
javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
org.apache.catalina.servlets.InvokerServlet.serveRequest(InvokerServlet.java:466)
org.apache.catalina.servlets.InvokerServlet.doGet(InvokerServlet.java:180)
javax.servlet.http.HttpServlet.service(HttpServlet.java:743)
javax.servlet.http.HttpServlet.service(HttpServlet.java:856)

note The full stack trace of the root cause is available in the Tomcat logs.
--Lakshmi
 
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Use System.err.println("Ecception: "+e.getStackTrace());

In general, Oracle provide two drivers, are you using the correct one?
Dan
 
danny liu
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Check the following line
con=connect();
check if con is null. If it is, then the connection is not build due
to error parameters.
Dan
 
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Posts: 13459
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"Lakshmi",
Please see Bear's post above.
Accounts with invalid display names get deleted. Please change your display name to something valid or your account will be deleted very soon.
thanks,
Dave.
 
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Posts: 2
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Hi,
It following line shows that the line no 32 may have error. Please execute your qry as sql and check you sql is correct and returning atleast one row.
servletwithjdbc.doGet(servletwithjdbc.java:32)

 
Lakshmi siri
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Hi all,
Now i got result.I set the classpath in Tomcat setclasspath.Now my program is running.
Thanks for your help.
--Lakshmi
 
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