Spring - No EntityManager with actual transaction available for current thread - cannot reliably process 'remove' call 에러 해결

https://stackoverflow.com/questions/32269192/spring-no-entitymanager-with-actual-transaction-available-for-current-thread

Spring - No EntityManager with actual transaction available for current thread - cannot reliably process 'persist' call

 

The @PersistenceContext annotation has an optional attribute type, which defaults to PersistenceContextType.TRANSACTION. This default is what you need to receive a shared EntityManager proxy. The alternative, PersistenceContextType.EXTENDED, is a completely different affair: This results in a so-called extended EntityManager, which is not thread-safe and hence must not be used in a concurrently accessed component such as a Spring-managed singleton bean. Extended EntityManagers are only supposed to be used in stateful components that, for example, reside in a session, with the lifecycle of the EntityManager not tied to a current transaction but rather being completely up to the application.

 

spring boot jpa 환경에서

 

db에 delete 명령을 보내 row를 삭제하려는 시도 중 발생하였다. 

 

@Transaction 어노테이션을 붙여주면 해결된다. 중복된 request를 방지하려는 목적 이라고 생각된다.