You should add your own repository manager like Nexus or Artifactory. Then, find out where this dependency is kept; there are repositories other than central. If it's kept on another repository, have your repository mirror that too.
Otherwise, Nexus or Artifactory have commands to enter the dependency manually. Create a local repository called "Third-party" and add it there.
Finally, change your settings.xml
file to refer everything to your repository manager.
The most common case for this is when a company refuses to license their products to be held at the central repository. For example, Microsoft won't let its sqljdbc.jar
file be distributed through Central. So, you need to add it by hand.