ag-grid is built so that it can integrate with any technology, this means that in theory, it shouldn't matter what backend you are using or even which framework, as we cover the most popular ones.
In our docs, we have examples that show ag-grid working with the different frameworks, but we don't cover the integration of ag-grid with particular backends or data sources.
The reason for this is purely to do with how complicated it would be to do so.
All of our examples that require a data source are written so that they can be easily adapted to your own convenience.
We do however have some examples that show some particularly popular approaches
Java & Oracle: https://www.ag-grid.com/oracle-server-side-operations/
Java & Spark: https://www.ag-grid.com/spark-server-side-operations/
How to do CRUD given a datasource interface: https://ag-grid.zendesk.com/hc/en-us/articles/360005170271-How-to-use-a-real-URL-Endpoint
Note that you are expected to come up with your implementation to connect ag-grid to your own particular backend/data source, but you can always contact us for help if you need support for any specific question that arises from your implementation