Efficient data transfer through zero copy in Java

You might want to read this interesting (albeit slightly outdated) post about leveraging `sendfile` in Node.JS by Peter Griess:<p><a href="http://blog.std.in/2010/09/09/using-sendfile-with-nodejs/" rel="nofollow">http://blog.std.in/2010/09/09/using-sendfile-with-nodejs/</a>

It's a nice idea, but I wonder about the use cases. How often would a Java webserver serve a file from disk without modifying it along the way? If performance is an issue then you'd serve the really static files with nginx (or a similar alternative), and every other file (jsp templates etc.) would be read in memory before being sent on.<p>(Note that I'm not questioning the technique, I just don't entirely agree on the way the article portrays the benefit of this method in webservers.)