Shakuntala
HI I am using Tomcat6.0 this is the problem i got wen i run the code , i am using login.html ,login .jsp,login.java and web.xml code
java.lang.NullPointerException org.apache.jsp.loginjsp.jspInit(login_jsp.java:23) org.apache.jasper.runtime.HttpJspBase.init(HttpJspBase.java:52) org.apache.jasper.servlet.JspServletWrapper.getServlet(JspServletWrapper.java:159) org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:329) org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:342) org.apache.jasper.servlet.JspServlet.service(JspServlet.java:267) javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
here is code login.jsp
<html> } }
<body bgcolor="white">
<h1> I have been invoked by <%
out.print(request.getAttribute("servletName").toString()); %></p>
<p></body>
</html></p>
<p>login.java</p>
<p>import java.io.IOException; import java.io.PrintWriter;</p>
<p>import javax.servlet.RequestDispatcher; import
javax.servlet.ServletException; import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;</p>
<p>public class Login1 extends javax.servlet.http.HttpServlet implements
javax.servlet.Servlet { static final long serialVersionUID = 1L;</p>
<p>protected void doGet(HttpServletRequest request, HttpServletResponse
response) throws ServletException, IOException { try{
response.setContentType("text/html"); PrintWriter out=response.getWriter();
String name=request.getParameter("name"); String
pass=request.getParameter("password");</p>
if(name.equalsIgnoreCase("Snipe")&& pass.equals("snipe")){
// getServletContext().getRequestDispatcher("/login.jsp").forward(request,response);
response.sendRedirect("/Simple/jsp/login.jsp");
}else{
out.println("<html>");
out.println("<body>");
out.println("Invalid User name OR passowrds");
out.println("</body>");
out.println("</html>");
}
}catch (Exception e) {
e.printStackTrace();
}
html file is:
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>User Login</title>
</head>
<body bgcolor="cream">
<form action="login" method="get">
Enter User name:
<input type="text" name="name"><br></p>
<p>Enter Password:
<input type="password" name="password"><br></p>
<p><input type="submit" name="submit" value="login"></p>
<p></body>
</html>
and web.xml code:
Does anyone have a clear resolution to this vexing issue? Thanks in advance.
December 22, 2010 at 5:12 PM
Hello Friend,
Try this:
1)form.html:
<html> <form method="post" action="http://localhost:8080/examples/jsp/login.jsp"> <table> <tr><td>Name:</td><td><input type="text" name="name"></td></tr> <tr><td>Address:</td><td><input type="password" name="password"></td></tr> <tr><td></td><td><input type="submit" value="Submit"></td></tr> </table> </form> </html>
2)login.jsp:
<%
String name = request.getParameter( "name" );
String pass = request.getParameter( "password" );
request.setAttribute( "theName", name );
request.setAttribute( "thePass", pass );
%>
<jsp:forward page="../Login1"/>
3)Login1.java:
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.*;
import javax.servlet.http.*;
public class Login1 extends javax.servlet.http.HttpServlet implements javax.servlet.Servlet { static final long serialVersionUID = 1L;
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
try{
response.setContentType("text/html");
PrintWriter out=response.getWriter();
String name=(String)request.getAttribute("theName");
String pass=(String)request.getAttribute("thePass") ;
System.out.println(name+" "+pass);
if(name.equalsIgnoreCase("Snipe")&& pass.equals("snipe")){
response.sendRedirect("/examples/jsp/form.html");
}else{
out.println("<html>");
out.println("<body>");
out.println("Invalid User name OR passwords");
out.println("</body>");
out.println("</html>");
}
}catch (Exception e) {
e.printStackTrace();
}
}
}
4)web.xml:
Put the following inside web-app tag:
<servlet>
<servlet-name>Login1</servlet-name>
<servlet-class>Login1</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>Login1</servlet-name>
<url-pattern>/Login1</url-pattern>
</servlet-mapping>
Thanks
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