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notification not as expected from session binding listener

 
sasikumar palakkizhi
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Hi all,

When i was practising one HttpSessionBindingListener program from HFSJ, I noticed that the listener methods are not producing the results as I expected.

The program was to print 'bound', when an object of type X is bound to the session and print 'unbound', when it is unbound. I added the object of type X two times using the code. The session attributes with name "sample" has been set in the valueBound and valueUnbound methods for monitoring in the doGet method of the servlet.

( relevant parts shown below ; request, session and pw are Servletrequest,HttpSession and PrintWriter objects).

INSIDE doGet METHOD


The code used for the class implementing HttpSessionBindingListener X is




Result obtained is


I expected that when I bind "new X()" for the second time to the same key, the first bound object will be removed and the valueUnbound method will be called(as well as valueBound). This is not happening. why?

"System.out.print("B")" ( commented in the question) is not producing any output.why

Please help in this topic.

thanks in advance
sasikumar
 
Bear Bibeault
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Please do not post the same question more than once.
 
It is sorta covered in the JavaRanch Style Guide.
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