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creating a security filter/how to create a user principle

 
Ranch Hand
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Not sure if this should be in the servlet section...

but here goes:

Was wondering how you can create a user principle and bind any given role to that use.

I have a tomcat webapp, and instead of using the tomcat form based login, I was wondering if it's possible to create a simple filter that catches any attempts to access the webapp, and fill the principle in myself. (Yes, I know this is basically what the form based login does...work with me on this ).

Creating the filter is fine, but I'm not entirely sure if you can insert the user principle so that tomcat would recognize it....
 
Rancher
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Offhand I don't know of a way to achieve this. What is the purpose of doing so?
 
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