I cannot connect jsp pages to mysql server

Question

I am using tomcat 6.0 This is my catalina home -> C:\\Program Files\\Apache Software Foundation\\Tomcat 6.0

I am using jdk 1.6 This is my JAVA_HOME C:\\Program Files\\Java\\jdk1.6.0_24

I am using windows 7

OK i wrote a jsp page This is the code Its saved in -> C:\\Program Files\\Apache Software Foundation\\Tomcat 6.0\\webapps\\myapp\\wow.jsp

<%@ page import="java.sql.*" %>
<%
   String connectionURL = "jdbc:mysql://localhost:3306/unni";
   Connection connection = null;
   Statement statement = null;
   ResultSet rs = null;
   %>



    <%
    Class.forName("com.mysql.Driver").newInstance();
    connection = DriverManager.getConnection(connectionURL, "root", "footyfreak");
    statement = connection.createStatement();
    rs = statement.executeQuery("SELECT * FROM unni");

    while (rs.next()) {
       out.println(rs.getString("player")+"");
    }

    rs.close();
    %>

I downloaded connector and copied it to :- C:\\Program Files\\Apache Software Foundation\\Tomcat 6.0\\webapps\\myapp\\WEB-INF\\lib\\mysql-connector-java-5.1.15-bin.jar

and also to C:\\Program Files\\Apache Software Foundation\\Tomcat 6.0\\lib\\mysql-connector-java-5.1.15-bin.jar

Then when I hit url http://localhost:8080/myapp/wow.jsp

I get an error as -------------->

HTTP Status 500 -

type Exception report

message

description The server encountered an internal error () that prevented it from fulfilling this request.

exception

org.apache.jasper.JasperException: An exception occurred processing JSP page /wow.jsp at line 12

9:    
10: 
11:     <%
12:     Class.forName("com.mysql.Driver").newInstance();
13:     connection = DriverManager.getConnection(connectionURL, "root", "footyfreak");
14:     statement = connection.createStatement();
15:     rs = statement.executeQuery("SELECT * FROM unni");


Stacktrace:
    org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:519)
    org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:410)
    org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313)
    org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:717)

root cause

javax.servlet.ServletException: java.lang.ClassNotFoundException: com.mysql.Driver
    org.apache.jasper.runtime.PageContextImpl.doHandlePageException(PageContextImpl.java:865)
    org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:794)
    org.apache.jsp.wow_jsp._jspService(wow_jsp.java:84)
    org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
    org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:386)
    org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313)
    org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:717)

root cause

java.lang.ClassNotFoundException: com.mysql.Driver
    org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1680)
    org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1526)
    org.apache.jasper.servlet.JasperLoader.loadClass(JasperLoader.java:128)
    org.apache.jasper.servlet.JasperLoader.loadClass(JasperLoader.java:66)
    java.lang.Class.forName0(Native Method)
    java.lang.Class.forName(Unknown Source)
    org.apache.jsp.wow_jsp._jspService(wow_jsp.java:68)
    org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
    org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:386)
    org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313)
    org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:717)

note The full stack trace of the root cause is available in the Apache Tomcat/6.0.32 logs.
Apache Tomcat/6.0.32

My classpath details are

variable : CLASSPATH
value    : C:\Program Files\Apache Software Foundation\Tomcat 6.0\lib\servlet-api.jar ; C:\Program Files\Apache Software Foundation\Tomcat 6.0\lib\mysql-connector-java-5.1.15-bin.jar;

Help me out. I have been sitting on this for days.

I did just as in the documentation.

Is there nething to be done apart from whats mentioned here?

Answer 1

java.lang.ClassNotFoundException: com.mysql.Driver

The class name is wrong. It is com.mysql.jdbc.Driver .

Class.forName("com.mysql.jdbc.Driver");

That newInstance() call is by the way superfluous. Please note that putting all that code inside a JSP file is a poor practice. That code should usually go in normal Java classes which you use in a servlet. Also note that the CLASSPATH environment variable is totally ignored when running Tomcat.

See also:

• Java connectivity with MySQL
• How to avoid Java code in JSP?

Answer 2

代替添加外部jar，将jar文件复制到以下位置

WEB-INF/lib

Answer 3

connection = DriverManager.getConnection(connectionURL, "root", "footyfreak"); In this connectionURL statement you want to give your database name. Example: String st="jdbc:mysql://localhost:3306/staff"; Connection con=null; Class.forName("com.mysql.jdbc.Driver").newInstance(); con = DriverManager.getConnection(st,"root","admin" ); String st="jdbc:mysql://localhost:3306/staff"; Connection con=null; Class.forName("com.mysql.jdbc.Driver").newInstance(); con = DriverManager.getConnection(st,"root","admin" ); In this example, staff is my database name. After giving like this, I didnt get that error message.