In Weblogic 12c, unlike previous versions, the Derby database that is embedded with the installation starts automatically.
That database is fine if our intention is to use it for a test or to develop, but not for a productive environment.
In either case, if it is necessary to prevent it from starting, we have several alternatives:
1. Change the start instruction to false in the file setDomainEnv.cmd or setDomainEnv.sh if it is Linux that is in the path $ WL_DOMAIN_HOME $ \ bi
2. As you will see in the previous image, a validation is made of whether the derby.jar file exists, so another alternative is to rename this file, so the validation will fail and the Derby database will not start.