HELP - HTTP Status 500 exception report when trying to connect MySQL

Question

Hi All,
I downloaded the MySQL Connector/J 3.0 from http://www.mysql.com/downloads/api-jdbc.html and set the classpath according to the documentation. However, when I try to use Servlet to connect to MySQL database, I get the following error:
HTTP Status 500 -
type Exception report
message
description The server encountered an internal error () that prevented it from fulfilling this request.
exception
java.lang.ClassCastException
     at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:903)
     at org.apache.catalina.core.StandardWrapper.allocate(StandardWrapper.java:668)
     at org.apache.catalina.servlets.InvokerServlet.serveRequest(InvokerServlet.java:416)
     at org.apache.catalina.servlets.InvokerServlet.doGet(InvokerServlet.java:180)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:740)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
     at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:247)
     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 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$StandardPipelineValveContext.invokeNext(StandardPipeline.java:641)
     at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
     at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
     at org.apache.catalina.core.StandardContext.invoke(StandardContext.java:2416)
     at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:180)
     at org.apache.catalina.core.StandardPipeline$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$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
     at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
     at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
     at org.apache.coyote.tomcat4.CoyoteAdapter.service(CoyoteAdapter.java:223)
     at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:601)
     at org.apache.coyote.http11.Http11Protocol$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:536)
The code of Connect.java is as follows:
import java.sql.*;
public class Connect {
String url;
public Connect() {
try{
Class.forName("com.mysql.jdbc.Driver").newInstance();
url = "jdbc:mysql:http://127.0.0.1:3306/db";
Connection con = DriverManager.getConnection (url, "username", "password");
catch(ClassNotFoundException e){
System.out.println(e.getMessage());
catch(SQLException e){
System.out.println(e.getMessage());
catch(Exception e){
System.out.println(e.getMessage());
Anyone please help me! Thanks!
Andy Stone
P.S. I can connect to the db successfully with JSP.

Answer 1

Try just putting in a main method and compiling and running it.import java.sql.*;
public class Connect {
    String url;
    public Connect() {
    try {
        Class.forName("com.mysql.jdbc.Driver").newInstance();
        url = "jdbc:mysql:http://127.0.0.1:3306/db";
        Connection con = DriverManager.getConnection(url, "username", "password");
    catch (Exception e){ e.printStckTrace() }
    public static void main(String[] args) { new Connect(); }
}