As others have said, run the package name with the changed domain name:
Register a domain such as myproject.org, and then use org.myproject.mymodule .
Or, if you do not have your own domain, use the subdomain where you place the code, for example. if you are net.sourceforge.myproject.mymodule code on myproject.sourceforge.net, use net.sourceforge.myproject.mymodule .
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