Class Cast Exception while reading the int value from a session object

Hi,

I am reading the int value from a session object in a jsp as follows.

session.setAttribute("number", 3);

accessing the above value as follows:
int n = Integer.parseInt((String)session.getAttribute("number"));

in the above case i am getting a Class Cast Exception.

if i read the same value by using the following code it's fine.
int n = Integer.parseInt(session.getAttribute("number").toString());

I have written this code long back it was working fine but from today only its getting the exception. I didnt update the system/tomcat server configurations.

Please help me out to resolve the issue.

If using 1.5 then

EDIT : done for missing brackets

Vivek Kr Singh wrote:If using 1.5 then int n =((Integer) session.getAttribute("number")).intValue();

EDIT : done for missing brackets

Hi thanks for the reply,

My question is something different the problem with the following statement:
(String)session.getAttribute("number")

here we are getting the Class Cast exception

String is not an Integer .

String is not an Integer .

But it was worked fine earlier its throwing the exception from today only. Its still working fine with some other servers.

Kumara Swamy wrote:
But it was worked fine earlier its throwing the exception from today only. Its still working fine with some other servers.

then can you find out the object type of the "number" attribute?

My question is why its working fine with some servers only?

session.setAttribute("number", 3);

accessing the above value as follows:
(String)session.getAttribute("number");

its throwing the Class Cast exception on some systems only all the servers on those systems are same.

Kumara Swamy wrote:
its throwing the Class Cast exception on some systems only all the servers on those systems are same.

The answare is same . "String is not an Integer" . some other server may be doing magic

You set it as an Integer, why cast it to a String?

Or to put it another way an attribute is not a parameter.

In fact you have set it like this:

session.setAttribute("number",3);
3 is not Integer it is int and this is the reason of the problem.

you should set it like this:

session.setAttribute("number","3") and read it (String) session.getAttribute("number");
or
session.setAttribute("number",new Integer(3)) and read it (Integer) session.getAttribute("number");

Charbel Keyrouz wrote:
session.setAttribute("number",3);
3 is not Integer it is int and this is the reason of the problem.

This is not a problem. In JDK 1.5 and beyond the 3 will be autoboxed as an Integer. Otherwise, it would not even compile.