The back button problem is standard. You need to use a token to prevent
sensitive form resubmission. This is documented in Geary's Advanced JSP
book and Core J2EEE patterns. They are both put out by Sun.
In short, tokens allow you to determine whether the page should be
processed in the
I'm sure many of you have run into these problems before:
1. My form is stored in the session, when the user updates, it goes back to a
list screen, the SaveAction servlet removes the form from the session.
PROBLEM: A NullPointerException is thrown when the user clicks on the back
button.
Basically, the problem is with browsers' caching. For
example, IE will ignore header settings you sent. In
several references you will find methods to set
headers, but they all ignore to recognize that it is
after all the browser that decides and/or ignores.
Back buttons are developers'
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