What is the reason for the error "mappedBy references an unknown target entity property" caused by org.hibernate.AnnotationException?

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The error "mappedBy references an unknown target entity property" caused by org.hibernate.AnnotationException typically occurs when there is a mismatch between the entity properties used in a JPA @OneToMany or @ManyToMany relationship mapping.

Specifically, this error occurs when the mappedBy attribute in the parent entity's relationship annotation is referencing a property in the target entity that does not exist. This could happen if the target entity has a different property name than what is referenced in the parent entity's mapping, or if the target entity's property is not annotated with the @OneToMany or @ManyToMany annotation.

To fix this error, make sure that the mappedBy attribute in the parent entity's relationship mapping is referencing a valid property in the target entity that has been properly annotated with the corresponding JPA relationship annotation.