request.getParameter always null

pixelmeow <>
Fri, 19 Jan 2007 13:19:08 -0500

I'm using the Apache Commons FileUpload package to upload a file,
along with some other information such as username. I'm using JSP to
send the file and info to a servlet. The problem is that the
request's parameters are always null.

The form section of the JSP:

    <form action="receivefileservlet" method="POST"
            <table cellspacing="0" cellpadding="0" border="0"
                <td valign="middle" align="right" width="20%"
                    height="110" style="font-family:Arial;
font-size:16.0px;"><br />Select a file type to
                <td valign="middle" align="left" width="80%"
                    height="110" style="font-family:Arial;
                    <br />
                  <input type="radio" name="inputradio"
value="0"/>option 1<br />
                  <input type="radio" name="inputradio"
value="1"/>option 2<br />
                  <input type="radio" name="inputradio"
value="2"/>option 3<br />
                  <input type="radio" name="inputradio"
value="3"/>option 4<br />
                  <input type="hidden" name="username" value= <%=
username %> >
                  <input type="hidden" name="full_name" value= <%=
full_name %> >
                  <input type="hidden" name="state" value= <%=
state_code %> >
                <td valign="middle" align="right" width="20%"
                    style="height:30.0px; font-family:Arial;
                    height="37">Enter file name to
                <td valign="middle" align="left" width="80%"
                    style="height:30.0px; font-family:Arial;
                  <input type="file" name="uploadfield"

                <td valign="middle" align="right" width="20%"
                    style="height:30.0px; font-family:Arial;
                <td valign="middle" align="left" width="80%"
                    style="height:30.0px; font-family:Arial;
                  <input type="submit" name="submit" value="Submit"/>

I've tried several ways to get the parameters from this, like:

--the way I'm used to doing it
String username = request.getParameter("username").toString();
String fullname = request.getParameter("full_name").toString();
String state = request.getParameter("state").toString();
String filetype = request.getParameter("inputradio").toString();
--First line throws nullpointerexception

--(found this on the web while googling)
    Attributes attribs = new Attributes();
    Map map = request.getParameterMap();
    Iterator iter = map.entrySet().iterator();
    while (iter.hasNext()) {
      Entry n = (Entry);
      String key = n.getKey().toString();
      String values[] = (String[]) n.getValue();
--map values, null, no keys or values

--The example code from Apache:
DiskFileItemFactory factory = new DiskFileItemFactory(size, tempPath);
ServletFileUpload upload = new ServletFileUpload(factory);
ServletFileUpload sfu = new ServletFileUpload();
isMultipart = sfu.isMultipartContent(ctx);
--last line ^^ throws nullpointerexception

I've been trying to find the answer for this all week, and I can't
find it. I've got some other code that worked for this, but it
depended on finding the indexOf() certain characters to get username
and state, and the file. I don't really want to do that. It was also
in a JSP rather than a servlet.

Almost bald from pulling my hair out, I'd love some help, and thank
you in advance for your consideration.

Teresa Robinson
General Dynamics
  Information Technology
Teresa.Robinson [at] gdit [dot] com

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