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From James Rome <jamesr...@gmail.com>
Subject Servlet navigation
Date Thu, 12 Jun 2008 19:16:40 GMT
I am doing a project for a class of HS teachers in July, to teach them
the wonders of Java and NetBeans. I designed a set of servlets to let
them manage student grades. I am having them design the basic HTML in
NVU, and put it into the try blocks of the NB-generated processRequest
servlets, and then put it into out.println("..."); blocks. I am using
Tomct.

I would use JSF myself, but I have no time to get into that, so I am
using forms and submit buttons to do the navigation.

So the first test is to see if the navigation works with the static HTML
servlet pages. When that works, I will put in the database queries. But
the navigation is not working for me. I changed the Project (classdata)
Run property in NB to point to login.

Here is the processRequest login code:
       response.setContentType("text/html;charset=UTF-8");
       PrintWriter out = response.getWriter();
       try {

           out.println("<html>");
           out.println("<head>");
           out.println("<title>Servlet login</title>");           
out.println("</head>");
           out.println("<body>");
           out.println("<h1 style=\"color: rgb(0, 102, 0);\">"
             +"Student Grade Manager Login</h1>"
             + "<form method=\"post\" action=\"dataSelection\"
name=\"login\">");
           out.println("<h3>User Name: <input maxlength=\"40\" size=\"40\""
              + "name=\"name\"></h3><br>");
           out.println("<h3>Password: <input maxlength=\"40\" size=\"40\""
               + "name=\"password\" type=\"password\"></h3>"
               + "<input name=\"Login\" value=\"Login\"
type=\"submit\"><br>");
           out.println("</body>");
           out.println("</html>");              } finally {
           out.flush();
       }

This displays, the debugger and html inspector show that it indeed calls
the servlet at classdata/dataSelection. Its processRequst code is:
     response.setContentType("text/html;charset=UTF-8");

     PrintWriter out = response.getWriter();

     try
     {
        out.println("<html>");
        out.println("<head>");
        out.println("<title>Servlet dataSelection</title>");
        out.println("</head>");
        out.println("<body>");
        out.println(
            "<h1 style=\"color: rgb(0, 102, 0);\">Student Grade
Data</h1>");
        out.println("<hr style=\"width: 100%; height: 2px;\">");
        out.println(
            "<form method=\"post\" action=\"studentData\" name=\"User
Choice\">");
        out.println("<h2>Student Data</h2>");
        out.println("<h3>Student Name:<input text=\"\"
name=\"studentName\""
                    + " type=\"\"></h3>");
        out.println("<input name=\"nameSubmit\" value=\"Submit Name\""
            + " type=\"submit\">");
        out.println("</form>");
        out.println("<hr style=\"width: 100%; height: 2px;\">");
        out.println("<h2>Class Data</h2>");
        out.println(
            "<form method=\"post\" action=\"classData\"
name=\"classData\">"
            + " <input name=\"classData\" value=\"Get Class Data\""
            + " type=\"submit\"></form>");
        out.println("<hr style=\"width: 100%; height: 2px;\">");
        out.println("<form method=\"post\" action=\"logout\""
                    + " name=\"Student Logout\"><input name=\"logout\""
                    + " value=\"Logout\" type=\"submit\"><br></form>");
        out.println("</body>");
        out.println("</html>");
     }
     finally
     {
        out.flush();
     }

But nothing displays! The login screen remains displayed. The browser
page source is blank.
And an initial navigation to the dataSelection URL is also blank.

What am I missing????

Here is web.xml:
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
   <servlet>
       <servlet-name>login</servlet-name>
       <servlet-class>ARC08.login</servlet-class>
   </servlet>
   <servlet>
       <servlet-name>logout</servlet-name>
       <servlet-class>ARC08.logout</servlet-class>
   </servlet>
   <servlet>
       <servlet-name>classData</servlet-name>
       <servlet-class>ARC08.classData</servlet-class>
   </servlet>
   <servlet>
       <servlet-name>studentData</servlet-name>
       <servlet-class>ARC08.studentData</servlet-class>
   </servlet>
   <servlet>
       <servlet-name>dataSelection</servlet-name>
       <servlet-class>ARC08.dataSelection</servlet-class>
   </servlet>
   <servlet-mapping>
       <servlet-name>login</servlet-name>
       <url-pattern>/login</url-pattern>
   </servlet-mapping>
   <servlet-mapping>
       <servlet-name>logout</servlet-name>
       <url-pattern>/logout</url-pattern>
   </servlet-mapping>
   <servlet-mapping>
       <servlet-name>classData</servlet-name>
       <url-pattern>/classData</url-pattern>
   </servlet-mapping>
   <servlet-mapping>
       <servlet-name>studentData</servlet-name>
       <url-pattern>/studentData</url-pattern>
   </servlet-mapping>
   <servlet-mapping>
       <servlet-name>dataSelection</servlet-name>
       <url-pattern>/dataSelection</url-pattern>
   </servlet-mapping>
   <session-config>
       <session-timeout>
           30
       </session-timeout>
   </session-config>
   </web-app>

There is nothing in the Tomcat log file, but the NetBeans console shows
Tomcat starting up OK.

Thanks for the help,
Jim

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