인프런 커뮤니티 질문&답변
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A class using the `@Entity` annotation for JPA mapping must basically meet these important conditions: 1. It must have a no-argument constructor (default constructor). 2. It must have a field representing the primary key, usually marked with the `@Id` annotation. 3. The class itself cannot be `final`. 4. It cannot be an `enum` or an `interface`.
All fields must be public
must be a final class
Must have a public or protected default constructor
must include at least one static method
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