Unable to retrieve values from request.getAttribute()

I had a JSP file called targetJspPage.jsp that contains the following statement within a set of <form> tags:
<% request.setAttribute "url","/myProj/targetJspPage.jsp");%>This information is then submitted to a servlet using POST method which will use a RequestDispatcher to retrieve the the url from the request attribute that I had set just now. The statement is as follows:
RequestDispatcher dispatcher = getServletContext().getRequestDispatcher((String)request.getAttribute("url"));
if (dispatcher != null)
dispatcher.forward(request, response);The purpose of this procedure is to let the servlet know which JSP file it is suppose to forward the processed results. The url is always the url of the page that is calling the servlet. Eg. In this case, my JSP file is targetJspPage.jsp which resides in myProj folder. So, in this JSP file, the url set for the servlet will be /myProj/targetJspPage.jsp. But my problem now is that the (String)request.getAttribute("url") statement in the servlet always returns null. Why is that so?
This type of question was asked numerous times in the forums but the solutions aren't working. I do not want to use a session to store the value. However, I also tried using session before and the result is the same.

Hi Sad,
1.
Is it possible that you post the codes that we can see clearly what is going on? (If possible only).
(Unless I'm wrong, it may be that the request.setAttribute is used to pass object on the server side only, ie you can't use the request.setAttribute to keep data like the session object during the client-server trips of request/response.
The fact that you get null for (String)request.getAttribute("url") is because the Browser send a new request object which is different from the old one (request.setAttribute which is gone once we down the client)
(2. I want to learn too, and hope some one will find a solution for you)
-- Paul.

Similar Messages

Unable to retrieve values from a table

I have created a table called ct_temp and it's structure is:
create table ct_temp(id char(2),srs number(3),amt number);
Result : Table Created
I now insert the following rows into the table:
id srs amt
1 62 30000
2 65 50000
3 65 70000
4 65 80000
5 62 16000
6 65 10000
7 65 100000
8 65 10
Commit
Then I issue the following query to retrieve data based on a specific criteria (Actually I have condensed the table and data because in Production, I have large number of rows; so for simplicity I am using 8 rows with one table)
criteria : I then want to retrieve the following:
for srs = 62, all values that is greater than 10,000
Answer: select decode(srs,62,ab.amt)temp1 ,decode(srs,65,ab.amt)temp2 from ct_temp ab
where decode(srs,62,ab.amt)>10000
Works like a charm and retrives the results.
Now comes the big issue
I want to retrieve the values for srs = 62 which is greater than 10,000 and at the same time I also want to retrieve the values for srs = 65 which is less than srs = 62.
Typically I wrote the query as:
select decode(srs,62,ab.amt)temp1 ,decode(srs,65,ab.amt)temp2 from ct_temp ab
where decode(srs,62,ab.amt)>10000
and decode(srs,65,ab.amt)<decode(srs,62,ab.amt)
Expected results should be:
srs amt
62 30000
62 16000
65 10
I should atleast get one row for srs = 65 which is id # 8 but it displays blank rows or "no rows returned".
I am actually preparing a ad-hoc report for the business analyst and stuck at this step due to which I am unable to proceed any further. I have used DECODE function because of the requirement specified by Business Analyst.
I have tried the following in the office:
using EXISTS operator = no luck
using INLINE VIEW = no luck
using UNION operator = No luck
Is there any way around? Please help me guys.
Sandeep
NOTE: The reason why I have used DECODE function is because in Production environment there are columns called
a) return line item which has numerous values like '001', '002', '062', '067'
b) there is another column called amount
c) so for every return line item there is an amount
so the business wants:
d) if the line item number = 62 then the amount should be dispplayed and it should be displayed as "AB Taxable income"
e) if the linte item number = 65 then the amount should be retrived and displayed as "Amount taxable in AB"
So seeing these multiple conditions for a "SELECT" statement, I used DECODE fuction.

user11934091 wrote:
What I have not been able to understand is why you have taken "0" there? Nulls! You need to use a number and not a null for a maths predicate.
The following is ALWAYS false:
and decode(srs,65,ab.amt) < decode(srs,62,ab.amt);
   is in fact:
and NULL < numberNull is not smaller than any number. Null is not larger than any number. Null is not equal to any number. Null is null. When it is not, that condition using Null is FALSE!!! Always.
So look at your data. You are introducing 2 new derived values called TEMP1 and TEMP2 using decode(). So let's add these to derived values as columns to the table so that you can see how the data set now looks like:
// add the 2 new columns
SQL> alter table ct_temp add( temp1 number, temp2 number );
Table altered.
// populate these new columns using your decode statements
SQL> update ct_temp
2 set     temp1 = decode(srs,62,amt),
3          temp2 = decode(srs,65,amt);
8 rows updated.
SQL> commit;
Commit complete.This is how the data set now looks like:
SQL> select * from ct_temp;
ID        SRS        AMT      TEMP1      TEMP2
1          62      30000      30000
2          65      50000                 50000
3          65      70000                 70000
4          65      80000                 80000
5          62      16000      16000
6          65      10000                 10000
7          65     100000                100000
8          65         10                    10
8 rows selected.Here are your 2 queries on this data set:
// 1st query finds 2 rows
SQL> select * from ct_temp where temp1 > 10000;
ID        SRS        AMT      TEMP1      TEMP2
1          62      30000      30000
5          62      16000      16000
// 2nd query finds the same 2 rows and then test
// whether TEMP2 is smaller than TEMP1 - as TEMP2
// is NULL for those 2 rows, this smaller than condition
// is FALSE. Thus no rows are found.
SQL> select
2          temp1,
3          temp2
4 from       ct_temp ab
5 where      temp1 > 10000
6 and        temp2 < temp1;
no rows selected
// You thus need to change NULLs into a number - this is done
// below using the NVL function. In my original example I did
// this in the DECODE itself by returning 0 instead of NULL.
SQL> select
2          temp1,
3          temp2
4 from    ct_temp ab
5 where   temp1 > 10000
6 and     nvl(temp2,0) < nvl(temp1,0);
     TEMP1      TEMP2
     30000
     16000Bottom line. YOU CANNOT EVALUATE NULLS USING MATHEMATICAL PREDICATES.
So - change the NULL to a number and the do the evaluation. Or determine what the business rule is for when there is no value to evaluate in the predicate and apply that rule.
That simple.

Error :Unable to retrieve data from iHTML servlet for Request2 request

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<%
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%>
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C:\Project\SRS\build\generated\src\org\apache\jsp\loginjsp.java:94: cannot find symbol_
C:\Project\SRS\build\generated\src\org\apache\jsp\loginjsp.java:95: cannot find symbol_
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C:\Project\SRS\nbproject\build-impl.xml:142: Compile failed; see the compiler error output for details.
BUILD FAILED (total time: 6 seconds)

As long as you're unable to compile Java code, please use the 'New to Java' forum. This is really trival.
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Retrieve values from a HTML table !!!

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Hi, Deepu.
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Message was edited by: Eduardo Silberberg

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Retrieving values from a table

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What is ResearchResults?
Is it a request parameter or is it a request attribute?
Parameters and attributes are two different things.
Request parameters: the values submitted from the form. Always String.
Request attributes: objects stored into scope by your code.
They are also accessed slightly differently in EL
java syntax == EL syntax
request.getParameter("myparameter") == ${param.myparameter}
request.getAttribute("myAttribute") == ${requestScope.myAttribute}
You are referencing the attribute in your scriptlet code, but the parameter in your JSTL/EL code.
Which should it be?
cheers,
evnafets

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Unable to retrieve values from request.getAttribute()

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