And here we go again.. The Netty Team brings you another release, named 3.5.4.Final, to rescue the day.
This is mostly a bug-fix release out of the 3.5.x Series, but also brings some performance optimization. One of these speed up the event processing and so through-put. Others reduce-memory copies or memory allocations.
It fixes 24 bugs/tasks in summary. So if you have trouble with an older release of netty, chances are good that we fixed it now 
Everyone using the OIO-Transport should upgrade ASAP. As older versions contained a bug which could lead to events not being fired if the underlying socket blocked on a read(..) operation. See #520 for more details.
Please checkout our issue tracker for a detailed overview about what was fixed as part of the release.
The JAR file can be found on Maven Central as usually. Beside this you can also get the full tarball from the download page.
Please let us know if you find any issues, in the meantime have fun developing with Netty.
Enjoy!