JPA

1.Caused by: org.hibernate.AnnotationException: mappedBy reference an unknown target entity property

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2.org.hibernate.TransientPropertyValueException: object references an unsaved transient instance - save the transient instance before flushing

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3.Error creating bean with name .. Unsatisfied dependency expressed through field '..Service';

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4.No Property "Method" found for type "Entity"

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5.[JPA] entity에서 출력 제외할 컬럼 지정시 @JsonIgnore 어노테이션 사용

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7.[JPA] projection entity 사용하여 데이터 꺼내오기

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8.[JPA] Data 포맷 변경하기

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