As long as you do not publish your software, any collisions do not bother anyone but yourself. If you have a personal domain name, I recommend that you use it. Otherwise, create something that you think is unlikely to collide.
When you decide to publish your software, it would be nice either to get the domain name for your project, or to us real or fictitious, based on (say) the DNS name of the place that you publish the source code; for example "net.sourceforge.myproject" ... where "myproject" is your official sourceforge project name.
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