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Motiviation: Preparing platform dependent code for using unsafe requires executing privileged code. The privileged code for initializing unsafe is executed in a manner that would require all code leading up to the initialization to have the requisite permissions. Yet, in a restrictive environment (e.g., under a security policy that only grants the requisite permissions the Netty common jar but not to application code triggering the Netty initialization), then initializing unsafe will not succeed even if the security policy would otherwise permit it. Modifications: This commit marks the necessary blocks as privileged. This enables access to the necessary resources for initialization unsafe. The idea is that we are saying the Netty code is trusted, and as long as the Netty code has been granted the necessary permissions, then we will allow the caller access to these resources even though the caller itself might not have the requisite permissions. Result: Unsafe can be initialized in a restrictive security environment.
Netty Project
Netty is an asynchronous event-driven network application framework for rapid development of maintainable high performance protocol servers & clients.
Links
How to build
For the detailed information about building and developing Netty, please visit the developer guide. This page only gives very basic information.
You require the following to build Netty:
- Latest stable Oracle JDK 7
- Latest stable Apache Maven
- If you are on Linux, you need additional development packages installed on your system, because you'll build the native transport.
Note that this is build-time requirement. JDK 5 (for 3.x) or 6 (for 4.0+) is enough to run your Netty-based application.
Branches to look
Development of all versions takes place in each branch whose name is identical to <majorVersion>.<minorVersion>. For example, the development of 3.9 and 4.0 resides in the branch '3.9' and the branch '4.0' respectively.