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Unable to pass variable to java method from jsp

Greenhorn

Posts: 24

posted 19 years ago

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Hi Friends,
I've this simple jsp,in which I take in query(from jsp1),pass it to java class and get the table.I sort the tables depending upon the table header clicked(index) and sort status given.
The problem is I want to send a "cnt" variable from jsp too,but when i do this ,it displays results correctly for the first time,and thereafter i am not able to sort or do anything.Is this a session problem,I have commented the code that's not working.Any help would be appreciated.

<%@ page import = "java.util.*" %>
<%@ page import = "bean.*" %>
<%@ page language="Java" %>
<jsp:useBean id = "t" scope="application" class="bean.ArrayComp" />
 
<%
String str  = (String)request.getParameter("query");
 
if (str != null){
   session.setAttribute("currentSQL", str);
}
else{
  str = (String)session.getAttribute("currentSQL");
  if (str == null){
    throw new Exception("ERROR: no query specified");
  }
}
String index="0";
String sortstatus="ASC";
 
if(request.getParameter("index")!= null)
{
  index = request.getParameter("index");
  sortstatus = request.getParameter("sort");
}
/*
int cnt=3;
ArrayList arr = t.retArrayList(str,index,sortstatus,cnt);
*/
ArrayList arr = t.retArrayList(str,index,sortstatus);
String[] name = t.retColNames();
 
   if(sortstatus.equals("ASC"))
   {
   sortstatus = "DESC";
   }
   else{
   sortstatus = "ASC";
   }
 
%>
   <html> <body>
   <table bgcolor=f08f4u CELLPADDING=2 >
   <thead>
    <tr>
       <%
       for(int i=0;i<name.length;i++){%>
       <th align='right'><a href='newqueryuser.jsp?index=<%= i%>&sort=<%= sortstatus %>'><%= name[i]%></a></th>
       <%}
 
       %>
    </tr>
   </thead>
  <%
    for (int i=0; i< arr.size(); i++){
    out.println((arr.get(i)).toString());
    }
    arr.clear();
  %>
   </table></body></html>

But,on the other hand if i hardcode this variable in the java class,everything starts working fine.Any clues???

Michal Bienek

Greenhorn

Posts: 29

posted 19 years ago

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Do you have any error logs?
What do you mean by "not being able to do anything"? Is the jsp not loading properly after the initial hit?
One issue could be that you are clearing the array, as this is being passed by reference, are you sure you are not making modifications that you expect to remain the arraylist in between requests?
Perhaps including the code to both version of retArrayList(...) could be beneficial.
Michal

Don't get me started about those stupid light bulbs.