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org.springframework.dao.InvalidDataAccessApiUsageException: No EntityManager with actual transaction available for current thread - cannot reliably process 'remove' call; nested exception is javax.persistence.TransactionRequiredException: No EntityManager with actual transaction available for current thread - cannot reliably process 'remove' call
Das hier könnte helfen: https://stackoverflow.com/questions/32269192/spring-no-entitymanager-with-actual-transaction-available-for-current-thread