개발

1.Maven

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2.어노테이션(Annotation)?

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3.kotlin ↔️ openJDK 이슈 해결기

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4.DataAccessResourceFailureException 이슈 해결기

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5.테스트에서 @Transactional을 사용하자

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6.JPA ENTITY LISTENER

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7.External API in @Transactional

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