Java beans in oracle developer suite 10g

Hello every body.
I'm a newbie in oracle. I want to use java beans in my forms. Using some examples I could write a form for login. The entered user name and password could be check in java class and then java class shows a message that says "login failed" or "login is successful". It is ok I think. But there is a problem.
The first time I type the user name and password, it seem that java class doesn't recognize it or maybe cash the before username and password. So the first time that I change the u and p the java class shows the result of before user. In java class I just have a simple if clause to check u and p.
In fact the sequence of execution of my program is like this:
Correct username and password ---> login failed
Correct username and password ---> login is successful
Correct username and password ---> login is successful
Correct username and password ---> login is successful
Wrong username and password ---> login is successful
Wrong username and password ---> login failed
Wrong username and password ---> login failed
Wrong username and password ---> login failed
Correct username and password ---> login failed
Correct username and password ---> login is successful
Correct username and password ---> login is successful
what can I do? should I clear the cash? where is it's cash? Any solution is really really appreciated.

Can you send me the .fmb & the .java,.class or the .jar file for login bean.
I will try in my pc and let u know the problem.

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