[해결 방법] org.hibernate.AnnotationException

👉 기본 환경

- Language: Java

- DB: H2 Database

- IDE: IntelliJ

 

 

⌨️ 코드

import javax.persistence.*;
import java.util.List;
 
public class Tmp {
 
    @Id @GeneratedValue
    @Column(name = "TMP_ID")
    private Long id;
 
    @OneToMany(mappedBy = "tmp")
    private List<TmpItem> tmpItems;
 
    public Long getId() {
        return id;
    }
 
    public void setId(Long id) {
        this.id = id;
    }
 
    public List<TmpItem> getTmpItems() {
        return tmpItems;
    }
 
    public void setTmpItems(List<TmpItem> tmpItems) {
        this.tmpItems = tmpItems;
    }
}
 

 

 

🖨️오류

Exception in thread "main" org.hibernate.AnnotationException: @OneToOne or @ManyToOne on jpabook.jpashop.domain.TmpItem.tmp references an unknown entity: jpabook.jpashop.domain.Tmp
    at org.hibernate.cfg.ToOneFkSecondPass.doSecondPass(ToOneFkSecondPass.java:97)
    at org.hibernate.boot.internal.InFlightMetadataCollectorImpl.processEndOfQueue(InFlightMetadataCollectorImpl.java:1823)
    at org.hibernate.boot.internal.InFlightMetadataCollectorImpl.processFkSecondPassesInOrder(InFlightMetadataCollectorImpl.java:1767)
    at org.hibernate.boot.internal.InFlightMetadataCollectorImpl.processSecondPasses(InFlightMetadataCollectorImpl.java:1655)
    at org.hibernate.boot.model.process.spi.MetadataBuildingProcess.complete(MetadataBuildingProcess.java:286)
    at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.metadata(EntityManagerFactoryBuilderImpl.java:1214)
    at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.build(EntityManagerFactoryBuilderImpl.java:1245)
    at org.hibernate.jpa.HibernatePersistenceProvider.createEntityManagerFactory(HibernatePersistenceProvider.java:56)
    at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:79)
    at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:54)
    at jpabook.jpashop.JpaMain.main(JpaMain.java:15)
 

 

 

📡 원인

Entity 클래스 선언 시, @Entity 선언을 하지 않아 인식되지 않음

그에 따라 Entity간 매핑해놓은 @ManyToOne에서 unknown entity exception 발생

 

 

📰 해결 방법

import javax.persistence.*;
import java.util.List;
 
@Entity
public class Tmp {
 
    @Id @GeneratedValue
    @Column(name = "TMP_ID")
    private Long id;
 
    @OneToMany(mappedBy = "tmp")
    private List<TmpItem> tmpItems;
 
    public Long getId() {
        return id;
    }
 
    public void setId(Long id) {
        this.id = id;
    }
 
    public List<TmpItem> getTmpItems() {
        return tmpItems;
    }
 
    public void setTmpItems(List<TmpItem> tmpItems) {
        this.tmpItems = tmpItems;
    }
}
 

Entity 클래스에 @Entity 추가