<p>We've been using the 32bit linux version of the <a href="http://wrapper.tanukisoftware.org/" rel="nofollow noreferrer">JavaServiceWrapper</a> for quite a while now and it's working perfectly. We are now considering also using it on 64bit linux systems. There are downloads for 64bit binaries on the website, but looking into Makefile for the 64bit version I found the following comment, though: 
    # This makefile is in progess. It builds, but the resulting libwrapper.so does not yet work.
    # If you know how to fix it then please help out.</p>

<p>Can anyone confirm, that this comment is just outdated and the resulting wrapper will work without flaws?</p>

From
http://wrapper.tanukisoftware.org/doc/english/introduction.html
:
Binary distributions are provided for
  the following list of platforms and
  are available on the download page.
  Only OS versions which are known to
  work have been listed.
(snip...)
linux - Linux kernels; 2.2.x 2.4.x, 2.6.x. Known to work with Debian and Red Hat, but should work with any
  distribution. Currently supported on
  both 32 and
64-bit
x86, and 64-bit ppc
  systems.