I would like to make a simple user registration application using java.
However, this application should maintain a local database for offline data access and a database in the cloud to synchronize information when I click a "sync" button.
My question is which databases can I use for the cloud and for local storage.
I have this type of doubt because I have not yet ventured with development in Java and no development for Android and the intention is to use something that is easier to implement, or that is already a standard for this type of application. >