Basic JPA annotations you should know (e.g. PersistenceContext, Transactional, etc)
Spring
@PersistenceContext
to DI EntityManager
@PersistenceUnit
to DI EntityManagerFactory
@Transactional
can add “readOnly=true” to apply to all methods in that class that are only for read usages (NOT write usages)
If there is write method, need to delcare exception via adding @Transactional to that method
I explained more on my previous post on @Transactional
@Autowired
Should be using constructor DI over @Autowired DI whenever you can
If there is 1 constructor, can omit @Autowired