I am trying to compare a couple ways of implementing a solution using JSP
and
Servlets. I am running NT with IBM VA Java (V 3), and within the Websphere
Test
Environment. The browser is IE 4.
I am experiencing a strange anomaly in the behaviour between the following
approaches and I am hoping someone may be able to explain.
Approach 1.
I have a search page (straight HTML). The Action of the form specifies a
Servlet The servlet creates a Java bean which does a bit of messaging and
eventually
contains some business data. I stuff this into the session, then redirect to
a JSP which displays the content of the data bean.
At the top of the JSP I have HTML which specifies no caching.
At the bottom, I remove the bean from the session.
>From this JSP, the user can choose to display further details of the data
displayed. If they choose to do this, a (different) servlet is called, a new
java bean
is created, and a different JSP page is called to display the detail.
>From this page, if the user presses the back button, the previous bean is
gone, and I can detect this and send to an error page. All is well.
Approach 2.
Similar to above. But I start with a JSP page which creates an empty bean
which will be used to hold search results and stuffs it into the session.
The action on the
form is a different JSP page which will do a bit of messaging and fill the
previously created bean with business data, and display it. (It also creates
the next data bean for further processing).
Again, the second JSP page contains the no-caching HTML and removes the
first bean from the session. It also allows navigation to further detail. To
do this a further JSP page is called just as above.
However, if the user now presses the back button, the previous page is
displayed, unlike the previous example, there is no attempt to re-run the
JSP so I can't detect that there is some potentially bad navigation going
on.
Why is the JSP not re-run when navigating back to the page, when in the
previous example the JSP is re-run ?
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