Spring Data JDBC is part of a larger project, Spring Data Relational. Spring Data JDBC requires JDBC which is a fully blocking API that isn't suitable in fully reactive stacks. At the moment of writing, the Spring Data team develops the R2DBC specification that allows drivers to provide a fully reactive and non-blocking integration with databases. These efforts are likely to be adopted in a Spring Data R2DBC module that will be part of the Spring Data Relational project. The following diagram shows the potential reactive stacks of Spring Data Relational: