When a dog sneeze and the cat got knocked down.  The following case show
that simple things could knock error out of tomcat (note that the cat does
not die).

Imagine authentication usin gmemory or database.  2 users 1 role for each.
When you login with a valid user name/pass, but wrong role for the
selected page, you won't see the invalid user/login, but you'll see access
error.  Now, go back (clicking on the back button), and then login as
valid user/role, you'll see a gain, the same message, although you should
be able to get into the page without any problem.  That's 2 knockouts
right there.

How could something this obvious, and sensity, and common slip into the
cat?





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