An entity cannot be annotated with both @Entity and @MappedSuperclass: com.example1.demo1.Entity.User錯誤

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項目問SpringDataJpa項目,在啟動並執行過程中出現的以下錯誤:

Caused by: org.hibernate.AnnotationException: An entity cannot be annotated with both @Entity and @MappedSuperclass: com.example1.demo1.Entity.User    at org.hibernate.cfg.AnnotationBinder.bindClass(AnnotationBinder.java:493) ~[hibernate-core-5.2.17.Final.jar:5.2.17.Final]    at org.hibernate.boot.model.source.internal.annotations.AnnotationMetadataSourceProcessorImpl.processEntityHierarchies(AnnotationMetadataSourceProcessorImpl.java:249) ~[hibernate-core-5.2.17.Final.jar:5.2.17.Final]    at org.hibernate.boot.model.process.spi.MetadataBuildingProcess$1.processEntityHierarchies(MetadataBuildingProcess.java:222) ~[hibernate-core-5.2.17.Final.jar:5.2.17.Final]    at org.hibernate.boot.model.process.spi.MetadataBuildingProcess.complete(MetadataBuildingProcess.java:265) ~[hibernate-core-5.2.17.Final.jar:5.2.17.Final]    at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.metadata(EntityManagerFactoryBuilderImpl.java:861) ~[hibernate-core-5.2.17.Final.jar:5.2.17.Final]    at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.build(EntityManagerFactoryBuilderImpl.java:888) ~[hibernate-core-5.2.17.Final.jar:5.2.17.Final]    at org.springframework.orm.jpa.vendor.SpringHibernateJpaPersistenceProvider.createContainerEntityManagerFactory(SpringHibernateJpaPersistenceProvider.java:57) ~[spring-orm-5.0.6.RELEASE.jar:5.0.6.RELEASE]

解決辦法:

在執行個體類上刪除掉@MappedSuperclass註解方可解決此錯誤,但是又會出現下面的錯誤:

 No identifier specified for entity: com.example1.demo1.Entity.User

這個錯誤的原因是ID主鍵沒有聲明,程式找不到主鍵才報的錯誤。

 

但是有些情況下,刪除這個註解也有可能會報其他的異常,請參考下面這篇部落格:

https://www.cnblogs.com/itiande/p/9139161.html

An entity cannot be annotated with both @Entity and @MappedSuperclass: com.example1.demo1.Entity.User錯誤

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