Solved
[AEM][6.4][Upgrade]- Java servlet can't register on fresh 6.4 install and are in satisfied state
Content backfill required
As Scott mentioned, you would need to modify the source code to bring it up. At bare minimum, fix the following:
Admin session would not work - return repository.loginAdministrative(null);
Use correct jar versions - When you build the project using Maven Archetype 13 (or higher), you would get the required dependencies and correct jar versions
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