How does the SecurityManager authorize with JAAS?

Hello,
I'm using java 1.3 and JAAS, trying to write my own Permission for authorization. How does the SecurityManager know to authorize a method for a Subject? Does the method that I want protected have to explicitly call checkPermission()?
The examples given are always for FilePermission. They show a program calling Subject.doAs() to perform an action as a particular Subject, and they imply that checkPermission() is called by the methods doing the file access.
Thanks

I think you
a) create a specific permission class (such as a "canDoThisPermission(String targetMethod)" class)
b) in your method check that the permission is granted by calling
checkPermission(new CanDoThisPermission(<methname>))
be sure your new permission class is being loaded from a trusted location (...lib/ext/... for eg.)

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