about session

[Muhammad Saifuddin]

Hi Ranchers,

I use this code to retieve the value from session in my jsp

 <% String userid = session.getAttribute("user_id"); %> 

but it didn't work but after applying this

 <% String userid = (String)session.getAttribute("user_id"); %>

it works fine..

My Question is.

Why my first code was not working ?
What session.getAttribute() return ?

Thanks,

[Natasza Biecek]

getAttribute() of HttpSession returns object (java.lang.Object)
http://java.sun.com/j2ee/sdk_1.2.1/techdocs/api/javax/servlet/http/HttpSession.html

so, it has to be casted to string, if not - expect error like this:
"Type mismatch: cannot convert from Object to String."

regards,
Natasza

[Prabhu Venkatachalam]

If you get any attributes in (request,session, application)using getAttribute() will return of type Object. So, you need to type cast it back to the Original class it belongs.

What session.getAttribute() return ?

Please refer API Reference documentation for these type of questions.