Solved

problems with database connections

Posted on 2003-11-17
6
314 Views
Last Modified: 2010-04-01
hai !!!

i'm trying to develop a web application using jsp and mysql as database . after reading the websites i came to a understanding that i need to install a jdbc driver .. i did that after downloading that and placed that on the  path C:\j2sdk1.4.2\jre\lib\ext\mysql-connector-java-3.0.9-stable-bin.jar .. i even changed the class path in the environment variables settings to
CLASSPATH=.;C:\j2sdk1.4.2\jre\lib\ext\mysql-connector-java-3.0.9-stable-bin.jar.

i tried to connect to the database using the following code but the connection to the database cannot be established ..please help me ..tell me what am i doing wrong and please suggest the correct way to do .

import java.sql.*;

public class JdbcExample1 {

  public static void main(String args[]) {
    Connection con = null;

    try {
      Class.forName("com.mysql.jdbc.Driver").newInstance();
      con = DriverManager.getConnection("jdbc:mysql:///test", "root", "root");

      if(!con.isClosed())
        System.out.println("Successfully connected to MySQL server...");

    } catch(Exception e) {
      System.err.println("Exception: " + e.getMessage());
    } finally {
      try {
        if(con != null)
          con.close();
      } catch(SQLException e) {}
    }
  }
}




i get the following exception :Exception: com.mysql.jdbc.Driver

please help me i'm very new to java programming

raghu
0
Comment
Question by:Raghunandan44
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 3
6 Comments
 
LVL 15

Expert Comment

by:jimmack
ID: 9770027
If you're using that JAR file, then you want the following Class.forName():

Class.forName("org.gjt.mm.mysql.Driver");

You shouldn't need the newInstance() on the end.

The URL in the line:

>> con = DriverManager.getConnection("jdbc:mysql:///test", "root", "root");

should include your server before the database name, eg:

con = DriverManager.getConnection("jdbc:mysql://localhost/test", "root", "root");


What is the full exception that is being displayed?
0
 

Author Comment

by:Raghunandan44
ID: 9771616
hai !!
thank u for u'r reply ..i did  the changes that you suggested in the reply and tried to compile and run the file. i still have that exception. " Exception: org.gjt.mm.mysql.Driver ".
please help me ..
thank you

raghu
0
 
LVL 15

Accepted Solution

by:
jimmack earned 20 total points
ID: 9771701
mysql-connector-java-3.0.9-stable-bin.jar should appear in your path for the web service, eg:

From kennethxu's comment in http://www.experts-exchange.com/Web/Web_Languages/JSP/Q_20799034.html

common/lib - visible by both tomcat server and all apps. for example, jdbc drivers.
server/lib - will only be accessed by tomcat server itself, not visible by apps.
shared/lib - visible by all apps, not visible to tomcat server. for example, your own util lib for all apps.
WEB-INF/lib - only visible by the app that contains the WEB-INF dir.
0
 
LVL 14

Expert Comment

by:kennethxu
ID: 9772883
what app server r u using?
0
 
LVL 15

Expert Comment

by:jimmack
ID: 9773373
Good point ;-)
0

Featured Post

Industry Leaders: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Popular third-party chat platforms like Slack, Discord, and Telegram are just a few of the many new productivity applications that are being hijacked by cybercriminals to create command-and-control (C&C) communications infrastructures for their malw…
In this blog post, we’ll look at how ClickHouse performs in a general analytical workload using the star schema benchmark test.
In this video, viewers are given an introduction to using the Windows 10 Snipping Tool, how to quickly locate it when it's needed and also how make it always available with a single click of a mouse button, by pinning it to the Desktop Task Bar. Int…
NetCrunch network monitor is a highly extensive platform for network monitoring and alert generation. In this video you'll see a live demo of NetCrunch with most notable features explained in a walk-through manner. You'll also get to know the philos…

695 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question