异常:org.hibernate.DuplicateMappingException: Duplicate class/entity mapping
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在使用hibernate 实体关联映射时出现了如下异常:
org.hibernate.DuplicateMappingException: Duplicate class/entity mapping com.etoak.entity.Student
at org.hibernate.cfg.Mappings.addClass(Mappings.java:141)
at org.hibernate.cfg.AnnotationBinder.bindClass(AnnotationBinder.java:789)
at org.hibernate.cfg.AnnotationConfiguration.processArtifactsOfType(AnnotationConfiguration.java:546)
at org.hibernate.cfg.AnnotationConfiguration.secondPassCompile(AnnotationConfiguration.java:291)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1333)
at org.hibernate.cfg.AnnotationConfiguration.buildSessionFactory(AnnotationConfiguration.java:867)
at com.etoak.factory.SessionFactory.rebuildSessionFactory(SessionFactory.java:71)
at com.etoak.factory.SessionFactory.getSession(SessionFactory.java:54)
at com.etoak.dao.OneToManyDao.add(OneToManyDao.java:12)
at com.etoak.test.Test.main(Test.java:17)
Exception in thread “main” java.lang.NullPointerException
at com.etoak.dao.OneToManyDao.add(OneToManyDao.java:13)
at com.etoak.test.Test.main(Test.java:17)
网上说法基本上都是 配置文件hibernate.cfg.xml中有重复的映射类。
而我的问题却不在这。
我出现这个异常的原因是hibernate映射注解配置错了。将@joinColumn注解放在set属性上面了。导致映射关系出错。
所以出这个问题的童鞋可以看下你的实体关系映射的书写是否正确。
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