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Prateek Mishra
jsp using include & with mysql
1 Answer(s)      3 years and 3 months ago
Posted in : JSP-Servlet


Sir,

I am creating a login application using jsp & Mysql. 

The Codes are---


Html File......


<html>
<head><title>LOGIN APPLICATION</title></head>
<body bgcolor="sky blue">
<font color="red"><b><blink>PLEASE ENTER THE USERID AND PASSWORD...........</blink></b></font>
<br>
<br>
<form method="get" action="login.jsp">
Enter UserId:<input type="text" name="userId"><br>
Enter Password:<input type="password" name="password"><br><br><br>

<input type="submit" value="LOGIN">
</form>
</body>
</html>


Jsp file.......

<%@ page import="java.sql.*" %>

<%

String mailid=request.getParameter("userId");
String password=request.getParameter("password");

Class.forName(application.getInitParameter("driverclass"));

Connection con=DriverManager.getConnection(application.getInitParameter("url"),application.getInitParameter("user"),application.getInitParameter("password"));

PreparedStatement stmt=con.prepareStatement("Select name from userinfo where mailid=? and password=?");

stmt.setString(1,mailid);
stmt.setString(2,password);

ResultSet rset=stmt.executeQuery();

if (rset.next())
{
    out.println("Welcome"+rset.getString(1));
}
else
{
    out.println("Invalid Userid Or Password.");

    %>

<%@ include file="login.html" %>

        <%
}
        out.close();
        %>



  WEB.xml...........

<web-app>

<context-param>
<param-name>driverclass</param-name>
<param-value>com.mysql.jdbc.Driver</param-value>
</context-param>

<context-param>
<param-name>url</param-name>
<param-value>jdbc:mysql://localhost:3306/userinfo</param-value>
</context-param>


<context-param>
<param-name>url</param-name>
<param-value>root</param-value>
</context-param>

<context-param>
<param-name>url</param-name>
<param-value>root</param-value>
</context-param>

</web-app>

It will producing error like...........

type Exception report

message

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

exception

org.apache.jasper.JasperException
    org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:372)
    org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
    org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:802)

root cause

java.lang.NullPointerException
    java.lang.Class.forName0(Native Method)
    java.lang.Class.forName(Class.java:164)
    org.apache.jsp.login_jsp._jspService(login_jsp.java:55)
    org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:94)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
    org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:324)
    org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
    org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:802)

note The full stack trace of the root cause is available in the Apache Tomcat/5.0.28 logs.

Please tell me the complete solution.


  Thanks,,,,

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View Answers

August 8, 2011 at 1:21 PM


It seems that application doesn't find mysql connector jar file. Download it and put it into lib of jdk and in tomcat lib.

Please go through the following link:

JSP Login Application



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