Problem with JBDC connection to mysql in tomcat

hi ,
can anyone plz help me?..
iam new to JSP. iam trying to impelement a application in JSP with JDBC connection using tomcat. Database is MYSQL .
iam getting the following error:
org.apache.jasper.JasperException: Unable to get connection, DataSource invalid: "org.apache.tomcat.dbcp.dbcp.SQLNestedException: Cannot create PoolableConnectionFactory (Server connection failure during transaction.
Attempted reconnect 3 times. Giving up.)"
     org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:510)
     org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:375)
     org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
     org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
     javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
root cause
javax.servlet.ServletException: Unable to get connection, DataSource invalid: "org.apache.tomcat.dbcp.dbcp.SQLNestedException: Cannot create PoolableConnectionFactory (Server connection failure during transaction.
Attempted reconnect 3 times. Giving up.)"
     org.apache.jasper.runtime.PageContextImpl.doHandlePageException(PageContextImpl.java:858)
     org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:791)
     org.apache.jsp.test_jsp._jspService(test_jsp.java:81)
     org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
     javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
     org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:332)
     org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
     org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
     javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
THIS IS MY APPLICATION:
<html>
<%@ taglib uri="http://java.sun.com/jsp/jstl/sql" prefix="sql" %>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<sql:query var="rs" dataSource="jdbc/TestDB">
select id, foo, bar from testdata
</sql:query>
<html>
<head>
<title>DB Test</title>
</head>
<body>
<h2>Results</h2>
<c:forEach var="row" items="${rs.rows}">
Foo ${row.foo}
Bar ${row.bar}
</c:forEach>
</body>
</html>
Following is the context file called "DBtest.xml" stored in webapps/DBtest/META-INF folder( i have a same copy of the file in /conf/Catelina/localhost)
<Context path="/DBTest" docBase="DBTest"
debug="5" reloadable="true" crossContext="true">
<Resource name="jdbc/TestDB" auth="Container" type="javax.sql.DataSource"
maxActive="100" maxIdle="30" maxWait="10000"
username="javauser" password="javadude" driverClassName="com.mysql.jdbc.Driver"
url="jdbc:mysql://localhost:3306/javatest?autoReconnect=true"/>
</Context>
i have following web.xml file in webapps/DBtest/WEB-INF
<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">
<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>
i have been refering to the internet form past 3 days and making lot of changes.but,there is no use.
plz guide me
thanks

Perhaps a stupid question: is MySQL running and listening on port 3306? The problem is not always in the webapp. Perhaps you can create a small test class that uses Driver to make a connection to your database.

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