In this first part we define the requirements against the application, its initial domain model and that REST API which its front-end will be using.

Last time I added username and password based authentication with using Spring Security.

So far the business logic, data access layer and the front controllers had been build, however enforcing authentication was completely missing.

When using Spring Data MongoDB IDs can be automatically generated for documents provided that you’re using an ObjectId, String or BigInteger as the underlying type.

During the investigation of a slowdown in a back-end Spring application, I found an interesting side-effect of using class-level @Transactional annotations on Groovy-based services.