dpkg-diversion confusion

["Todd A. Jacobs" <tjacobs-tmp-1224815297.406078@codegnome.org>]

I have a custom VNC jar file in /usr/share/java/vncviewer-4.1-local.jar,
and I want it to be used instead of the jar file installed by vnc-java
in /usr/share/java/vncviewer-3.3.3r2.jar, but I can't seem to get the
syntax right:

    $ sudo dpkg-divert --add --rename --divert \
    	/usr/share/java/vncviewer-4.1-local.jar \
	/usr/share/java/vncviewer-3.3.3r2.jar

    pkg-divert: rename involves overwriting
    `/usr/share/java/vncviewer-4.1-local.jar' with
      different file `/usr/share/java/vncviewer-3.3.3r2.jar', not
      allowed

How is this *supposed* to be done? The man pages aren't really very
clear to me.

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