Newbie Question: Problem with Tomcat and MySql
- From: asd <nospam@xxxxxxxxxx>
- Date: Fri, 30 Mar 2007 20:36:49 -0700
Hello all,
I am trying to develop a servlet that connects to MySql db.
Here is what I did.
Downloaded mysql-connector-java-5.0.5.
Copied "mysql-connector-java-5.0.5-bin.jar" file under
TOMCAT_DIR//common/lib
As instructed on
http://tomcat.apache.org/tomcat-4.1-doc/printer/jndi-datasource-examples-howto.html
I changed my TOMCAT_DIR/webapps/ROOT/WEB-INF/web.xml file to
<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE web-app PUBLIC
"-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
"http://java.sun.com/dtd/web-app_2_3.dtd";>
<web-app>
<description>MySQL Test App</description>
<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>
</web-app>
and I added following lines to server.xml under conf.
<Context path="/DBTest" docBase="DBTest"
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>
<!-- Maximum number of dB connections in pool. Make sure you
configure your mysqld max_connections large enough to handle
all of your db connections. Set to 0 for no limit.
-->
<parameter>
<name>maxActive</name>
<value>100</value>
</parameter>
<!-- Maximum number of idle dB connections to retain in pool.
Set to 0 for no limit.
-->
<parameter>
<name>maxIdle</name>
<value>30</value>
</parameter>
<!-- Maximum time to wait for a dB connection to become available
in ms, in this example 10 seconds. An Exception is thrown if
this timeout is exceeded. Set to -1 to wait indefinitely.
-->
<parameter>
<name>maxWait</name>
<value>10000</value>
</parameter>
<!-- MySQL dB username and password for dB connections -->
<parameter>
<name>username</name>
<value>MYUSERNAME</value>
</parameter>
<parameter>
<name>password</name>
<value>MYPASSWORD</value>
</parameter>
<!-- Class name for mm.mysql JDBC driver -->
<parameter>
<name>driverClassName</name>
<value>org.gjt.mm.mysql.Driver</value>
</parameter>
<!-- The JDBC connection url for connecting to your MySQL dB.
The autoReconnect=true argument to the url makes sure that the
mm.mysql JDBC Driver will automatically reconnect if mysqld closed the
connection. mysqld by default closes idle connections after 8 hours.
-->
<parameter>
<name>url</name>
<value>jdbc:mysql://localhost:3306/javatest?autoReconnect=true</value>
</parameter>
</ResourceParams>
</Context>
</Host>
</Engine>
</Service>
</Server>
I get following error when I run following code.
Here is error:
SQLException: No suitable driver found for
jdbc:mysql://localhost/javatest?user=tayf&password=nothing SQLState: 08001
VendorError: 0
Here is code
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
/** Simple servlet for testing the use of packages.
* <P>
* Taken from Core Servlets and JavaServer Pages 2nd Edition
* from Prentice Hall and Sun Microsystems Press,
* http://www.coreservlets.com/.
* © 2003 Marty Hall; may be freely used or adapted.
*/
public class HelloServlet2 extends HttpServlet {
public void doGet(HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html");
PrintWriter out = response.getWriter();
String docType =
"<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.0 " +
"Transitional//EN\">\n";
out.println(docType +
"<HTML>\n" +
"<HEAD><TITLE>Hello (2)</TITLE></HEAD>\n" +
"<BODY BGCOLOR=\"#FDF5E6\">\n" +
"<H1>Hello asdasdas (2)</H1>\n");
try {
Connection conn =
DriverManager.getConnection("jdbc:mysql://localhost/javatest?" +
"user=tayf&password=nothing");
// Do something with the Connection
} catch (SQLException ex) {
// handle any errors
out.println("SQLException: " + ex.getMessage());
out.println("SQLState: " + ex.getSQLState());
out.println("VendorError: " + ex.getErrorCode());
}
out.println("</BODY></HTML>");
}
}
I would be more than glad if you could help me figure out this problem.
Sincerely yours.
asd
.
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