JAR in release package is wrong version
The JAR included in the 3.0.4 release .zip and .tar.gz appears to be version 3.0.2, not 3.0.4.
Where did you get the 3.0.4 zip/tgz file from?
In maven central everything looks ok to me http://mvnrepository.com/artifact/dk.navicon/vldocking/3.0.4
Sorry, I should have specified. I'm talking about the zip/tgz attached to the GitHub release: https://github.com/cmadsen/vldocking/releases
Now I realize that these are simply GitHub zipping up the source tree on that tag, so really the issue is that the JAR in /jar has been sitting there untouched since 3.0.2. This, plus the way GitHub presents the zip/tgz, makes things quite confusing for non-Maven users.
I guess the easiest thing I could suggest to make things clearer would be to simply remove the jar. Then it's clear that you need to build it yourself if you download the source zip from GitHub.
Ok, I was not aware of the jar file. I will delete it in the next release.