How To Cook Org.Hibernate.Mappingexception: Unknown Entity Exception Inwards Java
Thursday, November 15, 2018
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If y'all bring used Hibernate amongst JPA too using musical note to declare your entity edible bean thence y'all powerfulness bring seen this confusing fault called "org.hibernate.MappingException: Unknown entity". This fault message is thence misleading that y'all 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 course of educational activity too DAO class to run across whether my Entity course of educational activity is annotated or not, simply I was nevertheless getting this fault message. After or thence goggling I eventually honour that, it was an wrong import which was causing this error.
Both hibernate too JPA has @Entity musical note too or thence 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 fault 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 musical note to use, shouldn't survive inwards org.hibernate.annotations.Entity, simply instead it's javax.persistence.Entity.
By the way, if y'all are using auto-complete functionality of Eclipse IDE, thence y'all tin toilet blame it them, alternatively y'all tin toilet configure your preferred import inwards Eclipse.
Version : Spring iii too Hibernate 3.6
Cause : Incorrect import for @Entity annotation, My entity course of educational activity was incorrectly annotated past times org.hibernate.annotations.Entity musical note 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 fault is similar/same names used past times JPA too hibernate. The org.hibernate.annotations existed earlier JPA 1. JPA straightaway exists too for novel projects, y'all likely desire to exercise it's annotations, though annoyingly they are oft subtly different. It could bring been improve had the JPA folks could bring used novel names too they did inwards or thence cases, simply the hibernate annotations, four years sometime earlier JPA1 came out were logical names.
Both hibernate too JPA has @Entity musical note too or thence 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 fault 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 musical note to use, shouldn't survive inwards org.hibernate.annotations.Entity, simply instead it's javax.persistence.Entity.
By the way, if y'all are using auto-complete functionality of Eclipse IDE, thence y'all tin toilet blame it them, alternatively y'all tin toilet configure your preferred import inwards Eclipse.
Error :
Exception inwards 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 course of educational activity was incorrectly annotated past times org.hibernate.annotations.Entity musical note 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 fault is similar/same names used past times JPA too hibernate. The org.hibernate.annotations existed earlier JPA 1. JPA straightaway exists too for novel projects, y'all likely desire to exercise it's annotations, though annoyingly they are oft subtly different. It could bring been improve had the JPA folks could bring used novel names too they did inwards or thence cases, simply the hibernate annotations, four years sometime earlier JPA1 came out were logical names.Further Learning
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