@RestController methods seem to be Transactional by default, Why?

Question

Using Spring boot 1.3.1

I don\'t understand why @RestController are Transactionnal by default. I haven\'t found anything saying so in the docs.

Example which pus

Answer 1

One-to-one relations are always eagerly fetched. Judging by method names book.getAuthor().getFirstname(), book->author and author->firstName are such relations. LazyInitializationException will only occur for lazy collections.