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Judul : How To Fix Org.Hibernate.Mappingexception: Unknown Entity Exception Inwards Java
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How To Fix Org.Hibernate.Mappingexception: Unknown Entity Exception Inwards Java

If you lot accept used Hibernate amongst JPA too using notation to declare your entity edible bean too hence you lot mightiness accept seen this confusing mistake called "org.hibernate.MappingException: Unknown entity". This mistake message is hence misleading that you lot could easily lose anywhere betwixt few minutes to few hours looking at wrong places. I was using Spring iii too Hibernate 3.6 when I got this error,which occurs when addEntity() method was executed. I checked everything, from Spring configuration file applicationContext.xml, Hibernate config file, my Entity degree too DAO class to run into whether my Entity degree is annotated or not, exactly I was nonetheless getting this mistake message. After around goggling I eventually detect that, it was an wrong import which was causing this error.

Both hibernate too JPA has @Entity notation too around how Eclipse was automatically importing org.hibernate.annotations.Entity instead of javax.persistence.Entity annotation. Once I fixed this import issue, everything went smooth.

Unfortunately, this mistake is non slow to spot, the org.hibernate.annotations.Entity import seemed completely appropriate to many programmers. For a newbie Java or hibernate developer it’s actually difficult to empathise which Entity notation to use, shouldn't live on inward org.hibernate.annotations.Entity, exactly instead it's javax.persistence.Entity.

By the way, if you lot are using auto-complete functionality of Eclipse IDE, too hence you lot tin blame it them, alternatively you lot tin configure your preferred import inward Eclipse.

Error :

Exception inward thread “main” org.hibernate.MappingException: Unknown entity: Person at org.hibernate.impl.SessionFactoryImpl.getEntityPersister(SessionFactoryImpl.java:580) at org.hibernate.impl.SessionImpl.getEntityPersister(SessionImpl.java:1365) at org.hibernate.event.def.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:121) at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.saveWithGeneratedOrRequestedId(DefaultSaveOrUpdateEventListener.java:210) at org.hibernate.event.def.DefaultSaveEventListener.saveWithGeneratedOrRequestedId(DefaultSaveEventListener.java:56) at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.entityIsTransient(DefaultSaveOrUpdateEventListener.java:195) at org.hibernate.event.def.DefaultSaveEventListener.performSaveOrUpdate(DefaultSaveEventListener.java:50) at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:93) at org.hibernate.impl.SessionImpl.fireSave(SessionImpl.java:562) at org.hibernate.impl.SessionImpl.save(SessionImpl.java:550)

Version : Spring iii too Hibernate 3.6

Cause : Incorrect import for @Entity annotation, My entity degree was incorrectly annotated past times org.hibernate.annotations.Entity notation rather than javax.persistence.Entity, which comes amongst JPA.

Solution : Use javax.persistence.Entity to annotate your entity beans. Don't import org.hibernate.annotations.Entity


package or wrong import of @Entity annotation. Another fact, which contribute to this mistake is similar/same names used past times JPA too hibernate. The org.hibernate.annotations existed earlier JPA 1. JPA straight off exists too for novel projects, you lot belike desire to utilization it's annotations, though annoyingly they are ofttimes subtly different. It could accept been improve had the JPA folks could accept used novel names too they did inward around cases, exactly the hibernate annotations, iv years quondam earlier JPA1 came out were logical names.

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Thanks for reading this article, if you lot similar this article too interview enquiry too hence delight part amongst your friends too colleagues. If you lot accept whatsoever enquiry or feedback too hence delight drib a comment.

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