May 1998
Intermediate to advanced
469 pages
14h 57m
English
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Protection Domains
A
protection
domain is a grouping of a code source
and permissions—that is, a protection domain represents all the
permissions that are granted to a particular code source. In the
default implementation of the Policy class, a
protection domain is one grant entry in the file. A protection domain
is an instance of the ProtectionDomain class
(java.security.ProtectionDomain
) and is constructed as follows:
- public ProtectionDomain(CodeSource cs, PermissionCollection p)
Construct a protection domain based on the given code source and set of permissions.
When associated with a class, a protection domain means that the given class was loaded from the site specified in the code source, was signed by the public keys specified in the code source, and should have permission to perform the set of operations represented in the permission collection object. Each class in the virtual machine may belong to one and only one protection domain, which is set by the class loader when the class is defined.
However, not all class loaders have a specific protection domain associated with them: classes that are loaded by the primordial class loader have no protection domain. In particular, this means that classes that exist as part of the system class path (that is, the Java API classes) have no explicit protection domain. We can think of these classes as belonging to the system protection ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.