Use of request.getParameter in JSP results in NullPointerException
Question
Trying to get a query string parameter and take an appropriate action in a JSP page.
Here is a snippet:
<%@ page import="com.companyx.portal.model.LDAPAttributes" %>
<%@ page import="com.companyx.portal.service.LDAPAttributesLocalServiceUtil" %>
<%@ page import="com.liferay.portal.model.User" %>
<%@ page import="com.liferay.portal.util.PortalUtil" %>
<%@ page import="javax.servlet.http.HttpServletRequest" %>
<%
User user = PortalUtil.getUser(request);
String screenName = user.getScreenName();
LDAPAttributes attr = LDAPAttributesLocalServiceUtil.getLDAPAttributes(screenName);
String store = attr.getLegacyStoreNo();
String org = request.getParameter("org");
%>
...more code here...
<html>
...html code here...
<form name="LoginForm" action="check_login.php">
<input type="hidden" name="LOGIN_NAME" size="20" value="<%= store %>" />
<input type="hidden" name="LOGIN_PASSWORD" size="20" value="<%= store %>" />
<input type="hidden" name="ORGANIZATION" value="<%= org %>" />
</form>
When the following lines are absent:
String org = request.getParameter("org");
...
<input type="hidden" name="ORGANIZATION" value="<%= org %>" />
The script works just fine, but I need to capture an 'org' parameter from the query string, write it into the generated form and submit it. When those lines are present, though, I get a 500 error.
Any thoughts?
6 answers
solution1
5 ACCPTED 2012-01-20 18:21:01
Chances are you're working with the PortletRequest and not the HttpServletRequest .
HttpServletRequest realRequest = PortalUtil.getHttpServletRequest(request);
String organization = realRequest.getParameter("org");
solution2
4 2012-01-20 05:16:18
String org = request.getParameter("ORGANIZATION");
solution3
1 2012-01-20 05:05:12
try this,
<input id ="org" type="hidden" name="org" value="" />
Then you can add any value to value property.
String org = request.getParameter("org"); // get from input hidden id
solution4
0 2012-01-20 05:21:26
If you are passing org in the query string properly , then your code will work correctly.
And if it is not working properly, use request.setAttribute("org",org_value) instead of passing org value as query parameter and get the org value in jsp using request.getAttribute("org").toString . It will definitely work.
solution5
0 2012-01-20 05:42:32
If your problem is not solved even after trying what Andrew Thompson has asked. Incase you are using Tomcat, can you try changing the name of "org" variable to something else. I don't remember exactly but once I have faced a similar problem in one of the versions of Tomcat where "org" variable name was not allowed.
solution6
-1 2012-07-31 07:54:53
if i use request.getParameter() two times in the same jsp page.
for the 2nd time it shows null.
like
if(request.getParameter("frmdttxt") != request.getParameter("start_date")){
out.println("we are here");
date_flag="DNM";
}else{
date_flag="DM";
}
if(request.getParameter("page_number")==null){
//System.out.println("we are here");
frmdt = request.getParameter("frmdttxt");
todt = request.getParameter("todttxt");
stat = request.getParameter("status");
regn = request.getParameter("region");
}
then frmdt is null.
The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.