Jdbc through mysql

how i can connect jdbc to a java program through mysql in netbean 6.9.1 with user name and password.

Quite old hint but maybe will be helpful. Look here.

Similar Messages

Need help setting up JDBC with mySQL and Netbeans

I've successfully got mySQL up and running and created a few simple test databases. I've been following the instructions on this website (http://www.stardeveloper.com/articles/display.html?article=2003090401&page=1 ) to get JDBC working but have had little luck.
I've downloaded JDBC from mySQL website, extracted the mysql-connector-java-3.1.13-bin.jar file and changed the class path to :
C:\Program Files\Java\jre1.5.0_06\lib\ext\mysql-connector-java-3.1.13-bin
which is where I placed the .jar file.
I then used the following code provided on stardeveloper.com to test a connection with the test database.
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
public class JdbcExample2 {
public static void main(String args[]) {
    Connection con = null;
    try {
      Class.forName("com.mysql.jdbc.Driver").newInstance();
      con = DriverManager.getConnection("jdbc:mysql:///test",
        "root", "secret");
      if(!con.isClosed())
        System.out.println("Successfully connected to " +
          "MySQL server using TCP/IP...");
    } catch(Exception e) {
      System.err.println("Exception: " + e.getMessage());
    } finally {
      try {
        if(con != null)
          con.close();
      } catch(SQLException e) {}
}It compiles but when run I get the error message :
java.lang.NoClassDefFoundError: testdatabase/JdbcExample2
Exception in thread "main"I assume this means that my classpath isn't setup correctly but I have no idea what's up and how to correct it.
Can someone PLEASE tell me how to setup jdbc and what I've done wrong.
Thanks in advance :)

Thanks for your reply. I've made some progress but I'm still having problems.
In mySQL I created a new user called uraknai with password n0121429 and granted them access to a test database I created called pet.
Then, in netbeans, I clicked the Runtime tab, clicked Databases and rightclicked Drivers and clicked Add Driver. I then added the driver mysql-connector-java-3.1.13-bin.jar. I then right clicked the newly added driver and selected the connect using option. I filled in the appropriate boxes clicked ok and it connected successfully.
Then, under the project tab, I right clicked the project name, clicked properties then clicked Libraries and added the .jar file mysql-connector-java-3.1.13-bin.jar
I then ran the following code to test the connection to the database:
import java.sql.*;
public class ConnectionTest {
    public ConnectionTest() {
    public static void main(String[] args)
        System.out.println("BEGIN CONNECTION TEST");
        Connection conn = null;
        try
               String userName = "uraknai";
               String password = "n0121429";
               String url = "jdbc:mysql://localhost/pet";
               Class.forName ("com.mysql.jdbc.Driver").newInstance ();
               conn = DriverManager.getConnection (url, userName, password);
               System.out.println ("Database connection established");
         catch (Exception e)
               System.err.println ("Cannot connect to database server");
         finally
               if (conn != null)
                   try
                       conn.close ();
                       System.out.println ("Database connection terminated");
                   catch (Exception e) { /* ignore close errors */ }
}and get the message:
java.lang.NoClassDefFoundError: math/ConnectionTest
Exception in thread "main"
Java Result: 1when I run the code.
Can someone explin what I've done wrong and how to fix the problem.
Cheers.

JDBC or MySQL cache - update query

The following query is ok but only works after a second refresh of the page.
The query is manupulated by the URL:
UPDATE activiteiten SET afgerond = 'checked' WHERE id=6
UPDATE activiteiten SET afgerond = 'unchecked' WHERE id=6
The query works (without errors) but somethime the query was not executed. My teacher said he thought that it was the cache. He refers to ODBC because he known the problem there.
Maybe somebody here can help me to stop JDBC or MySQL caching, were can I configure it? Waiting for response, Adri

do a commit after your execution of statement..

JDBC through Applet...

We are getting 'AccessControlException' while using JDBC through Applet.
Can anybody suggest the changes to be made in the policy file OR security setting OR security Manager.

The tutorial gives help about it at :
http://java.sun.com/docs/books/tutorial/security1.2/tour1/index.html
hope it will help.

MySQL - Another 'Can't connect through mysql.sock' question...

Hey, folks.
So I'm trying to install MySQL to run with PHP on my PowerBook G4 (running 10.4.7, non-server edition) to use it to test out a shopping cart program for a website I'm building.
I had it working as of Monday, when I installed it, got all the permissions set, built the necessary tables, and changed the root password (and logged in just to make sure it worked before retiring for the night)...but today I realized that I had somehow installed the wrong version of MySQL (I connected to it earlier today and discovered it was 4.026 - and I needed to be running MySQL 4.1.20, in order to be running the same version as my webhost).
So I decided to upgrade. I downloaded and installed the 4.1.20 file, followed the directions about creating the system tables, changed permissions via sudo chown -R mysql:mysql data...and now, when I go to change the root user password (just to make sure it's still the same as it was), I get the following error:
error: 'Can't connect to local MySQL server through socket '/tmp/mysql.sock' (2)'
Check that mysqld is running and that the socket: '/tmp/mysql.sock' exists!
This error also occurs when I try to simply startup MySQL. I also now find I can't connect via MySQL Admin, either - it gives me the same error. Pinging the host works, however.
Sooo...anyone have any ideas? I've read up on the forums re: Apple changing the socket to /var/mysql/mysql.sock as of 10.4.4, but it seems that would have affected me earlier this week when I was running the previous version of MySQL, too (I certainly haven't upgraded the OS since then).
Regardless, I can't connect through MySQL Admin using the /var/mysql/mysql.sock socket, anyway...nor the standard /tmp/mysql.sock.
Any thoughts on what might be causing this? I should confess, I'm well-versed in DOS (ugh), but UNIX is not really my strong suit, so I'm still figuring out how to get around in the Terminal...
Thanks so much for any input you can give me!
(Oh, one more thing, since it'll probably come up - I'm not currently connecting via PHP, but I will be eventually. Right now, I just want to be able to change my root password, and login from the Terminal)!
Thanks again!\
PowerBook G4 1GHz 15 Mac OS X (10.4.7)

Alright, folks.
Somehow my computer has fixed itself. After wiping the mysql directories entirely, then reinstalling, I was still getting the same error.
After going back to the original "MySQL-On-Mac" site at Marc Liyanage's entropy.ch site & following some of the instructions there, somehow my problem seems to have fixed itself.
I wish I could tell you what the solution was (to benefit anyone else having this problem), but since I was simply following the unix commands listed there (without much explanation, at times, as to what they were doing), I just know that somehow it worked.
(But if I had to make a guess, I think it had to do with starting the server via sudo ./bin/mysqld_safe &)...

Thin JDBC through firewall - what ports need to be open?

We are running Oracle 7.3, and Oracle Web Server on the same
computer. The firewall is set up to allow connections to that
computer from anywhere, on ports 80 and 1521.
Our thin JDBC applet works perfectly from inside the firewall,
but from outside, I get a time-out error trying to open the JDBC
connection.
What else needs to be done get JDBC through? Do other ports need
to be open on the firewall?
The JDBC FAQ mentions a "Net8 compliant" or "SQLNet certified"
firewall - is that relevant to this problem, and if so, what does
it really mean?
We are supposed to be operational right now, so many many thanks
for any help on this!
- Joe Wielgosz
null

Try in the Lion Server Forum?
Regards,
Colin R.

Jdbc for mySql Database

I want to connect to MySql Database. My program Source is :
import java.sql.*;
@SuppressWarnings({"ALL"})
public class test {
public static void main(String args[]) throws ClassNotFoundException, SQLException, IllegalAccessException, InstantiationException {
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver").newInstance();
Connection con = DriverManager.getConnection ("jdbc:odbc:mysql://127.0.0.1:3306, "root", "edlovema1017");
Statement stmt = con.createStatement();
stmt.executeUpdate("DROP TABLE users");
There is an error when my program is running.
this error :
Exception in thread "main" java.lang.NullPointerException
     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
     at java.lang.reflect.Method.invoke(Method.java:585)
     at com.intellij.rt.execution.application.AppMain.main(AppMain.java:90)

1) How do you compile that?
in
getConnection ("jdbc:odbc:mysql://127.0.0.1:3306, "root", "edlovema1017");closing " is missing for the first parameter
2) why jdbc:odbc:mysql not just jdbc:mysql ?
3) as sabre150 stated, use
Class.forName("com.mysql.jdbc.Driver")instead of
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver").newInstance();4) NEVER leave connection opened - add con.close() at the end
5) Specify the database name, e.g.
getConnection ("jdbc:mysql://127.0.0.1:3306/mydb", "root", "edlovema1017");6) good luck

JDBC/JSP/MySQL Code works from my local machine, but not on server

Hi there!
I've been struggling with this problem for a while.
I have a database from which I need to read and display some data on a browser. (The database is set up for remote access).
I'm using the following JSP/JDBC code to do that.
Class.forName ("com.mysql.jdbc.Driver").newInstance();
out.println(" Connecting to DB...Pls. Wait ");
Connection con = DriverManager.getConnection("url","user","pwd");
if(con.isClosed())
out.println(" " +"Could NOT connect to MySQL Database...");
else out.println(" CONNECTED !!! ");
Statement stmt = con.createStatement();
results = stmt.executeQuery("SELECT * FROM TableName" );
When I run this of my local machine, it works fine. But when I upload it to a server, it doesn't run through. I dont get either the connected or not connected message.
I tried this piece of code that I found online to check the driver.
/*Driver d = (Driver)Class.forName("com.mysql.jdbc.Driver").newInstance();
out.println(" Got a driver instance. ");
if (d.acceptsURL(url)) out.println(" The driver does accept my URL");
else out.println(" The driver doesn't like the URL I'm trying"); */
I ran it off the server and it worked. I got the outputs --Got a driver instance and The driver does accept my URL
I'm unable to figure out why this code can be run locally from my machine, but not from a different location. The database is NOT on my machine.
Any inouts will be really appreciated.
I'm using an Apache Tomcat container and the database is MySQL.

Just wanted to mention
The database is on another (3rd) machine.
So I have
1. My local machine
2. Database hosted on a 2nd machine
3. Place I'm moving my code to (its basically a hosting account provided by an external company)
I can access the database from my local machine. However, when I move the code over to another machine, it doesn't work.

A question about JDBC and MySQL

hello dear friends,ask a question:
if in MySQL database, i have defined a clumon as TEXT data type.
when i use JDBC, i use which kind of java data type to hold TEXT,
i mean which getXXX() method i should use.
is it possible i just use getObject() and cast it to a binarystream??
thanks in advanced.

use this:
declare it 1st
String x ="";
then u can now get the value of the field...
x = getString("<fieldName>");is there length limitation?
for example, i want store a String which is got from a JTextArea, i also treat it as String and insert into the column with TEXT datatype like
insert table_name (text_column) values( string_1)
this works in JSP, should work in JAVA too...
hope i helped... ^_^

Problem in jdbc-tomcat-mysql connection

hi everybody
i m in serious problem since last 15-20 days. i m trying hard to make the connection jdbc-mysql using tomcat with the help of a jsp test page but every time i am facing almost the similar probems listed below in detail:
to make sure that the jdrivers's .jar (mysql-connector-java-3.1.7-bin.jar) available for such connections working fine i have tried the above said connection without using tomcat....which is working fine...for this i have created a dummy database with a dummy table ..and written some queries in the .java file of my code which upon running inserts the specified values in the defined(dummy) database.
this is the confirmation that the classpath etc..are ok in regard to the mysql-connector-java-3.1.7-bin.jar
now i have placed a copy of this .jar file in to the commons/lib directory of the tomcat web server(which is suppossed to be the place for such external jars)
after doing so i have followed 2 methods :
method 1st:........
i have made aone more jar file from the following .java file....
import javax.naming.*;
import javax.sql.*;
import java.sql.*;
public class TestSQLLoad
String user = "Not Connected";
String pwd = "no pwd";
int id = -1;
public void init() {
try{
Context ctx = new InitialContext();
if(ctx == null ) {
throw new Exception("Boom - No Context");
DataSource ds = (DataSource)ctx.lookup("java:comp/env/jdbc/TestDB");
if (ds != null) {
Connection conn = ds.getConnection();
if(conn != null) {
user = "Got Connection "+conn.toString();
Statement stmt = conn.createStatement();
String q = "select name, password, id from user";
ResultSet rst = stmt.executeQuery(q);
if(rst.next()) {
user=rst.getString(1);
pwd=rst.getString(2);
id = rst.getInt(3);
conn.close();
}catch(Exception e) {
e.printStackTrace();
public String getUser() {
return user;
public String getPassword() {
return pwd;
public int getID()
return id;
after compiling it at the cmd prompt i made a .jar file from the .class of it and named it MySQLLoad.jar...then i placed it also in to the commons/lib directory where the mysql-connector-java-3.1.7-bin.jar was already placed.
then i have changed the server.xml and web.xml files from the conf directory of the tomcat as given here:
server.xml



<Server port="8005" shutdown="SHUTDOWN">

<Listener className="org.apache.catalina.mbeans.ServerLifecycleListener" />
<Listener className="org.apache.catalina.mbeans.GlobalResourcesLifecycleListener" />

<GlobalNamingResources>

<Environment name="simpleValue" type="java.lang.Integer" value="30"/>

<Resource name="UserDatabase" auth="Container"
type="org.apache.catalina.UserDatabase"
description="User database that can be updated and saved"
factory="org.apache.catalina.users.MemoryUserDatabaseFactory"
pathname="conf/tomcat-users.xml" />
</GlobalNamingResources>


<Service name="Catalina">


<Connector
port="80" maxThreads="150" minSpareThreads="25" maxSpareThreads="75"
enableLookups="false" redirectPort="8443" acceptCount="100"
connectionTimeout="20000" disableUploadTimeout="true" />

 



<Connector port="8009"
enableLookups="false" redirectPort="8443" protocol="AJP/1.3" />






<Engine name="Catalina" defaultHost="localhost">




<Realm className="org.apache.catalina.realm.UserDatabaseRealm"
resourceName="UserDatabase"/>







<Host name="localhost" appBase="webapps"
unpackWARs="true" autoDeploy="true"
xmlValidation="false" xmlNamespaceAware="false">









<Context path="/testdb" docBase="TOMCAT_HOME/webapps/tomcat-docs/testdb"
debug="5" reloadable="true" crossContext="true" >
<Logger className="org.apache.catalina.logger.FileLogger"
prefix="localhost_DBTest_log." suffix=".txt"
timestamp="true"/>
<Resource name="jdbc/TestDB"
auth="Container"
type="javax.sql.DataSource"/>
<ResourceParams name="jdbc/TestDB">
<parameter>
<name>factory</name>
<value>org.apache.commons.dbcp.BasicDataSourceFactory</value>
</parameter>

<parameter>
<name>maxActive</name>
<value>10</value>
</parameter>

<parameter>
<name>maxIdle</name>
<value>5</value>
</parameter>

<parameter>
<name>maxWait</name>
<value>10000</value>
</parameter>

<parameter>
<name>username</name>
<value>root</value>
</parameter>
<parameter>
<name>password</name>
<value>mysql</value>
</parameter>

<parameter>
<name>driverClassName</name>
<value>com.mysql.jdbc.Driver</value>
</parameter>

<parameter>
<name>url</name>
<value>jdbc:mysql://localhost/testdb?autoReconnect=true</value>
</parameter>
</ResourceParams>
</Context>
</Host>
</Engine>
</Service>
</Server>
and the other xml file i.e
web.xml is here:
<?xml version="1.0" encoding="ISO-8859-1"?>
<web-app xmlns="http://java.sun.com/xml/ns/j2ee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"
version="2.4">
















































<servlet>
<servlet-name>default</servlet-name>
<resource-ref>
<description>DB Connection</description>
<res-ref-name>jdbc/TestDB</res-ref-name>
<res-type>javax.sql.DataSource</res-type>
<res-auth>Container</res-auth>
</resource-ref>
<servlet-class>org.apache.catalina.servlets.DefaultServlet</servlet-class>
<init-param>
<param-name>debug</param-name>
<param-value>0</param-value>
</init-param>
<init-param>
<param-name>listings</param-name>
<param-value>true</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>












<servlet>
<servlet-name>invoker</servlet-name>
<servlet-class>
org.apache.catalina.servlets.InvokerServlet
</servlet-class>
<init-param>
<param-name>debug</param-name>
<param-value>0</param-value>
</init-param>
<load-on-startup>2</load-on-startup>
</servlet>










<!--

Look at the URl below:
How to connect to Microsoft SQL server with Type 4 JDBC driver
http://www.java-tips.org/content/view/615/29/

JDBC and MySQL connectivity problem

The code i hav attached generates Connectivity exception.. the prob is with the part in bold.. can anyone help
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
public class testconn {
public static void main(String args[]) {
    Connection con = null;
            String serverName = "localhost:8080";
        String mydatabase = "imagedb";
        String url = "jdbc:mysql://" + serverName + "/" + mydatabase; // a JDBC url
        String username = "am";
        String password = "ta";
    try {
      Class.forName("com.mysql.jdbc.Driver");
     con= DriverManager.getConnection(url, username, password);
      if(!con.isClosed())
        System.out.println("Successfully connected to " +
          "MySQL server using TCP/IP...");
    } catch(Exception e) {
      System.err.println("Exception: " + e);
    } finally {
      try {
        if(con != null)
          con.close();
      } catch(SQLException e) {}
}

I had such issue too, and I fixed it by adding in the environment variables the CLASSPATH entry that pointed to all the directories containing the .jar needed for the applications.
for example I used jodbc folder to connect mysql database (I installed last version and I got same issue than yours and it seems to be a 'connector' issue, exactly the same issue than yours) I got something like
CLASSPATH=my root dir/the java dir/the lib dir/jodbc;my root dir/the java dir/other important libs containing .jar files;
This is what I got for the issue, still working around (at the level of mysql all is ok, ...)
Microsoft Windows XP [version 5.1.2600]
(C) Copyright 1985-2001 Microsoft Corp.
C:\Documents and Settings\Hurukan>java ConnectJODBC brol
java.lang.ClassNotFoundException: com.mysql.jdbc.Driver
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClassInternal(Unknown Source)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Unknown Source)
at ConnectJODBC.main(ConnectJODBC.java:108)
[exception] -- la valeur de 'con' est nulle (DriverManager � retourn� une valeur
nulle)
C:\Documents and Settings\Hurukan>set
APPDATA=C:\Documents and Settings\Hurukan\Application Data
CLASSPATH=c:\Program Files\Java\jdk1.5.0_06\lib;c:\Program Files\Java\jdk1.5.0_06\dev;\c:\Program Files\Java\jdk1.5.0_06\lib\jodbc;
Here is the code that generated this exception
String dburl="jdbc:mysql://127.0.0.1/nosdisques"; // should be next passed by command line
String password="**scrambled**";
String username="**scrambled**";
Connection con=null;
Statement stmt=null;
ResultSet res=null;
String requete="";
String strToWrite="";
// Connexion � la base de donn�e
// Won't work with mysql 5.0.18, mysql connector 3.51.12 is installed [???]
// Previous tests with 5.0.18 were running good, that has started with the last os restoration (and the connector was different of course...)
// tried to retreive older version of the mysql connector
try
Class.forName("com.mysql.jdbc.Driver").newInstance();
con=DriverManager.getConnection(dburl,username,password);
System.out.println("Nous sommes connect\u201as \u2026 la base " + con.getCatalog());
catch(SQLException sqlex)
System.out.println("[sqlexception]\n");
System.exit(3);
catch(Exception ex)
ex.printStackTrace();
if(con == null)
System.out.println("[exception] -- la valeur de 'con' est nulle (DriverManager \u2026 retourn\u201a une valeur nulle)\n");
System.exit(4);
System.out.println("Impossible to join database, access denied\n");
System.out.println("Verify settings (mysqld or firewall)\n"); System.exit(2);
Maybe the drivers used (last one: connector/j 3.1.12). The .jar file is in the %classpath% directory c:\Program Files\Java\jdk1.5.0_06\lib.
Can't really understand why this code won't run anymore, ...
I took a look on the other computer where the same code is running ok.
These are the differences:
mysql server is 5.0.18 on the other computer the version is 3.23.41
mysql connector is 3.51.12 on the other computer the version is 3.0.10
access rights are the same because the database is the dumped one from 3.23.41 to 5.0.18, and I'm quite good with the dbms management (I'm IT developper in fact, trying to take over java technology ;) )
in this case this is not a sql error but java error.
the jar file is set to the %classpath% folder on both computers
I copied the jar from the other computer, removing the new .jar file and... it failed, exactly the same issue
Still working around, ...
Dimitri

JDBC Java- mysql problem help!

Hi, I wnat to connect to mySQL fromo Java, I followed all the instructions from the mySql web page, yet I havent been able to do it, when I compile the java progrm I keep getting class not found exceptions, I am using Fedora Core and Java was already installed-well I chose to install it when I installed the operating system, the point is that the paths are all assigned by he system not by me.
WHat can I do?, Ive been trying over andover again with no results, hopefully somebody can help, I tried to include all the configuration in this email,
thank you
my java program is the following:
t.java
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
public class t {
public static void main (String[] args) {
System.out.println("Hello, world!\n");
Class.forName("com.mysql.jdbc.Driver");
when I javac t.java
I have the following error
4. ERROR in t.java
(at line 11)
Class.forName("com.mysql.jdbc.Driver");
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Unhandled exception type ClassNotFoundException
when I comment out the Class.forName the hello world rogram runs fine
when I vi /etc/java java.conf this is the result
# System-wide Java configuration file -- sh --
# JPackage Project [www.jpackage.org]
# Location of jar files on the system
JAVA_LIBDIR=/usr/share/java
# Location of arch-specific jar files on the system
JNI_LIBDIR=/usr/lib/java
# Root of all JVM installations
JVM_ROOT=/usr/lib/jvm
# You can define a system-wide JVM root here if you're not using the default one#JAVA_HOME=$JVM_ROOT/java-gcj
# Options to pass to the java interpreter
JAVACMD_OPTS=
~
[root@localhost test]# echo $PATH
/usr/kerberos/sbin:/usr/kerberos/bin:/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/usr/X11R6/bin:/root/bin
echo $JAVA_HOME
it contains nothing
ls /usr/share java*
java
java-1.3.0
java-1.4.0
java-1.4.1
java-1.4.2
java-1.5.0
javadoc
java-ext
java-utils
mysql-connector-java-3.1.13-bin.jar is under
/usr/share/java
in /etc/profile I have:
export CLASSPATH=$CLASSPATH:/usr/share/java/mysql-connector-java-3.1.13-bin.jar
in /root/.bash_profile i have
CLASSPATH=/usr/share/java/mysql-connector-java-3.1.13-bin.jar:/usr/lib/java-ext/mysql-connector/mysql-connector-java-3.1.13-bin.jar
export CLASSPATH
when I echo $PATH i have
/usr/kerberos/sbin:/usr/kerberos/bin:/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/usr/X11R6/bin:/root/bin

Thanks duff,
The driver seems to be found
when I run
public class t {
public static void main (String[] args) {
try
System.out.println("Hello, world!\n");
Class.forName("com.mysql.jdbc.Driver");
System.out.println("MySQL Driver Found");
catch (ClassNotFoundException e)
System.out.println("MySQL Driver NOT Found");
e.printStackTrace();
I feel somehow ive been focusing in the wrong side of the problem due to my ignorance in Java. Please help me to understand, the reson for which ithe runtime was telling me that there was an unhandled exception was because it is a requirement to handle all exceptions of this kind? why wouldnt it cmplain if I jst did the hello world without any exception handling, maybe because it is a requirement in the Class.forName...
the other question is, is the message I was obtaining completely independent of the fact that the class was or was not found?
Maybe, I should go with these questions to the newbies forum...
thanks

JDBC with MySQL

I am writing a Java Servlet that needs to connect to a MySQL database.
I would like to know which Java drive a need to use and also the java code that creates the connection on a Windows platform.
Thank you for your help.
Luis

This is a sample code. Try to have a look. And u also have to download MM-Mysql driver. Hope this helps u!
<%@ page import="java.util.*" %>
<%@ page import="star.utiltools.*" %>
<%@ page import="java.io.*" %>
<%@ page import="java.sql.*" %>
<html>
<head>
<meta name="GENERATOR" content="Microsoft FrontPage 3.0">
<meta name="Microsoft Border" content="none">
<title>Log Monitor By MYSQL</title>
</head>
<body bgcolor="#E2E2E2">
<jsp:useBean id="MySQLListLoader" scope="session" class="star.utiltools.MySQLListLoader"/>
<jsp:setProperty name="MySQLListLoader" property="*"/>
<form name="infoForm" method=GET action="testTableListMySQL.jsp">
Log Monitor 
<hr color="#008000" noshade size="1">
<%
//Set variable by request parameter
String DBColName = request.getParameter("colName");
String filterValue = request.getParameter("filterValue");
String filterCol = request.getParameter("filterCol");
Connection conn = null;
try {
Class.forName("org.gjt.mm.mysql.Driver").newInstance();
catch (Exception e) {
out.println("Unable to load driver." + e);
try {
conn = DriverManager.getConnection("jdbc:mysql://172.16.88.86/test");
catch (NullPointerException e) {
e.printStackTrace();
catch (SQLException e) {
SQLException sqle = new SQLException("Unable to make conn " + e.toString() );
out.println("Unable to make conn :" + e.toString() );
throw sqle;
catch (Exception e) {
Exception ee = new Exception("Connecting error :" + e.toString() );
out.println("Connecting error :" + e.toString() );
throw ee;
if(conn == null) throw new NullPointerException(" Connection fails ");
* Set Display Column Name
Vector displayColName = new Vector();
displayColName.addElement("System");
displayColName.addElement("Report Mode");
displayColName.addElement("Profile ID");
displayColName.addElement("Submit User");
displayColName.addElement("Status");
displayColName.addElement("Filename");
displayColName.addElement("Start Time");
displayColName.addElement("End Time");
displayColName.addElement("Comment");
displayColName.addElement("Reserved 1");
displayColName.addElement("Reserved 2");
* Core Part
try
MySQLListLoader.reset();
MySQLListLoader.setConnection(conn);
MySQLListLoader.setDefaultPage("testTableListMySQL.jsp");
MySQLListLoader.setDisplayColName(displayColName);
MySQLListLoader.setHeaderColor("bgcolor='#7DBEAA'");
MySQLListLoader.setBgcolor("bgcolor='#7DBEFF'" , "bgcolor='#C4E1FF'" ); // Set bgcolor
//Set SQL
MySQLListLoader.setSelectStat("SELECT * FROM SCHEDULELOG");
if(filterValue == null || filterCol == null || filterValue.equals("*") || filterValue.equals(""))
{MySQLListLoader.setWhereStat("WHERE 0 = 0 ");}
else
{ MySQLListLoader.setWhereStat("WHERE " + filterCol + "= '" + filterValue + "'");}
if(DBColName == null)
{ MySQLListLoader.setDefaultOrderBy("SYSTEM"); }
else
{ MySQLListLoader.setDefaultOrderBy(DBColName);}
//Set for add new
MySQLListLoader.setAddNewLink("addnew.jsp?typr=add");
out.println(MySQLListLoader.generatedPage());
}catch(SQLException ex){
out.println(" SQL Error in generated list : " + ex.toString());
}catch(Exception ex){
out.println("Error in generated list : " + ex.toString());
%>
</form>
</body>
</html>

Very urgent !!!!!!!! Jdbc error mysql error

hii
i am not been able to connected to d/b ,i am using mySQL..
so plz tell me the soln.i have downloaded the connector j and set the class path..now tell me how to connect the d/b..also tell me how to that we r connectd to the database ,if possible send me the whole code..it will veru good help...
thanks...
take care.
Rahul

Hii essube
i am u code for all my classes
1.Database class(just does the Connection to D/B)
2.LanguageFunctions class(class which does the Proccessing)
3.LanguageDetailsServlet class(Servlet)
1.Databaseclass
package Langpack;
import java.io.*;
import java.sql.*;
import java.util.*;
import java.net.URL;
public class Databaseclass
Databaseclass objDatabaseclass=new Databaseclass();
Connection con=null;
public Databaseclass()
System.out.println("Me inside the Database Class");
protected Connection openConnection()
// Init the properties
Properties moConnectionProperties = new Properties();
moConnectionProperties.put("host", "localhost");
moConnectionProperties.put("port", "3306");
moConnectionProperties.put("database", "BAEKO");
moConnectionProperties.put("driver", "com.mysql.jdbc.Driver");
 moConnectionProperties.put("user", "root");
 moConnectionProperties.put("password", "password");
// load the driver
try {
Class.forName("com.mysql.jdbc.Driver");
//Class.forName("org.gjt.mm.mysql.Driver");
catch (Exception ex)
System.err.println("driver Class not found\n" + ex);
System.exit(-1);
// connect to database
try {
String mSURL = "jdbc:mysql://" + moConnectionProperties.get("host") + ":" +
moConnectionProperties.get("3306") + "/" + moConnectionProperties.get("BAEKO");
con = DriverManager.getConnection(mSURL, moConnectionProperties);
catch (Exception ex)
 System.err.println("can't connect database\n" + ex);
 System.exit(-1);
 return con;
 public void closeConnection()
 try{
 con.close();
 catch(Exception e){;}
2.LanguageFunctions Class
package Langpack;
import java.io.*;
import java.sql.*;
import java.util.*;
public class LanguageFunctions extends Databaseclass
public LanguageFunctions()
 super();
LanguageDetails getDetails(String X)
 LanguageDetails objLanguageDetails=null;
 try
 Statement st=con.createStatement();
 ResultSet result=st.executeQuery("Select languageName From LanguageMast Where languageNo='"+ X +"';");
 objLanguageDetails=new LanguageDetails();
objLanguageDetails.languageName=result.getString ("languageName");
objLanguageDetails.languageNo=result.getString("languageNo");
catch(Exception e)
return objLanguageDetails;
LanguageDetails getAllDetails()
int i=0;
LanguageDetails vArray[]=null;
LanguageDetails objLanguageDetails=null;
try
Statement st=con.createStatement();
ResultSet result=st.executeQuery("Select * From LanguageMast;");
while(result.next())
objLanguageDetails=new LanguageDetails();
objLanguageDetails.languageName=result.getString("languageName");
objLanguageDetails.languageNo=result.getString("languageNo");
vArray=objLanguageDetails;
i++;
objLanguageDetails=null;
catch(Exception e){;}
return objLanguageDetails;
boolean saveDetails(Vector X)
LanguageDetails objLanguageDetails=null;
Vector objVector=null;
objVector=X;
String vlanguageName;
String vlanguageNo;
try
Statement st=con.createStatement();
objLanguageDetails=new LanguageDetails();
objLanguageDetails=(LanguageDetails)objVector.elementAt(0);
vlanguageName=objLanguageDetails.languageName;
vlanguageNo=objLanguageDetails.languageNo;
ResultSet rls=st.executeQuery("SELECT * FROM LanguageMast WHERE languageNo='"+ vlanguageNo +"'");
if (rls.getRow()==0)
rls.moveToInsertRow();
rls.updateString(vlanguageName,"languageName");
rls.updateString(vlanguageNo,"languageNo");
rls.insertRow();
else
rls.updateString(vlanguageName,"languageName");
rls.updateRow();
return false;
catch(Exception e)
return true;
3.LanguageDetailsServlet class
package Langpack;
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.sql.*;
import java.util.*;
public class LanguageDetailsServlet extends HttpServlet
public String vlanguageNo;
public String vlanguageName;
PrintWriter pw;
public void service(HttpServletRequest req, HttpServletResponse res)
LanguageFunctions objLanguageFunctions=null;
LanguageDetails objLanguageDetails=null;
Vector vect=new Vector();
try
vlanguageNo=req.getParameter("txtLanguageNo");
vlanguageName=req.getParameter("txtLanguageName");
objLanguageDetails=new LanguageDetails();
pw=res.getWriter();
res.setContentType("text/html");
pw.println("<html><body>"+vlanguageNo+"</body></html>");
pw.println("<html><body>"+vlanguageName+"</body></html>");
objLanguageDetails.setNo(vlanguageNo);
objLanguageDetails.setName(vlanguageName);
vect.addElement(objLanguageDetails);
objLanguageFunctions=new LanguageFunctions();
objLanguageFunctions.saveDetails(vect);
catch(Exception e)
pw.close();
guys this is code and i am getting error after cliking th submit button on my wepage as:
type Exception report
message
description The server encountered an internal error () that prevented it from fulfilling this request.
exception
javax.servlet.ServletException: Servlet execution threw an exception
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:269)
 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193)
 at filters.ExampleFilter.doFilter(ExampleFilter.java:149)
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:213)
 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193)
 at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:256)
 at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
 at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
 at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
 at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
 at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
 at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:494)
 at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:641)
 at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
 at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
 at org.apache.catalina.core.StandardContext.invoke(StandardContext.java:2415)
 at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:180)
 at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
 at org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatcherValve.java:171)
 at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:641)
 at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:172)
 at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:641)
 at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
 at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
 at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:174)
 at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
 at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
 at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
 at org.apache.coyote.tomcat4.CoyoteAdapter.service(CoyoteAdapter.java:223)
 at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:594)
 at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:392)
 at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:565)
 at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:619)
 at java.lang.Thread.run(Thread.java:534)
root cause
java.lang.StackOverflowError
Apache Tomcat/4.1.24
now tell me the soln of this..i am really fed up of this..plz help me
also tell me hw to check the connection is done or not...thanks
waiting for ur suggetions
Take Care
Rahul.

JDBC for MySQL + TOMCAT

Anybody knows how to configure the JDBC + TOMCAT?

try to install mysql-connector-java into java home
directory. and specify the path in classpath.
had i answered ur question correctly.No JARs belong in JAVA_HOME.
Tomcat ignores your system CLASSPATH.
This advice is utterly, completely wrong. It's not even wrong.
Put the MySQL JAR in your app's WEB-INF/lib directory, then learn to configure a JNDI data source.
%

Jdbc through mysql

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