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最近学习SSH出现这个情况，也比较奇怪，我用junit测试的没问题，但提交的表单数据就有问题出现org.hibernate.MappingException: Unknown entity:异常： stujiating1 : com.xjgl.server.entity.Stujiatinginfotb@5868d40c Hibernate: select stujiating0_.id as id1_, stujiating0_.sno as sno1_, stujiating0_.jiatingjiegou as jiatingj3_1_, stujiating0_.jiatingfenwei as jiatingf4_1_, stujiating0_.jiatingdizhi as jiatingd5_1_, stujiating0_.jiatingdianhua as jiatingd6_1_, stujiating0_.youbian as youbian1_, stujiating0_.dushengzhinv as dushengz8_1_ from stujiatinginfo stujiating0_ where stujiating0_.sno=? 2014/11/10 12:48:05[DEBUG][com.xjgl.server.dao.StujiatinginfoDao]:144 -- 添加学生101_1的家庭信息成功 ================================================== student.getStujiatinginfo() : com.xjgl.server.entity.Stujiatinginfotb@1fd7855 stujiating2.sno : 101_2 stujiating2.youbian : Hibernate: insert into student (name, sno, id) values (?, ?, ?) Hibernate: insert into stujiatinginfo (sno, jiatingjiegou, jiatingfenwei, jiatingdizhi, jiatingdianhua, youbian, dushengzhinv, id) values (?, ?, ?, ?, ?, ?, ?, ?) Hibernate: select stujiating0_.id as id1_, stujiating0_.sno as sno1_, stujiating0_.jiatingjiegou as jiatingj3_1_, stujiating0_.jiatingfenwei as jiatingf4_1_, stujiating0_.jiatingdizhi as jiatingd5_1_, stujiating0_.jiatingdianhua as jiatingd6_1_, stujiating0_.youbian as youbian1_, stujiating0_.dushengzhinv as dushengz8_1_ from stujiatinginfo stujiating0_ where stujiating0_.sno=? 2014/11/10 12:48:05[ERROR][org.apache.struts2.dispatcher.Dispatcher]:38 -- Exception occurred during processing request: Unknown entity: com.xjgl.server.entity.Stujiatinginfotb$$EnhancerByCGLIB$$5d40c870 org.hibernate.MappingException: Unknown entity: com.xjgl.server.entity.Stujiatinginfotb$$EnhancerByCGLIB$$5d40c870 at org.hibernate.impl.SessionFactoryImpl.getEntityPersister(SessionFactoryImpl.java:691) at org.hibernate.impl.SessionImpl.getEntityPersister(SessionImpl.java:1485) at org.hibernate.event.def.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:120) 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:713) at org.hibernate.impl.SessionImpl.save(SessionImpl.java:701) at org.hibernate.impl.SessionImpl.save(SessionImpl.java:697) at com.xjgl.server.dao.StujiatinginfoDao.saveStujiatinginfo(StujiatinginfoDao.java:143) 程序代码： Stujiatinginfotb stujiating1 = new Stujiatinginfotb();
stujiating1.setId(sid + "_1");
stujiating1.setSno(sno + "_1");
System.out.println(" stujiating1 : " + stujiating1);
stujiatinginfoDao.saveStujiatinginfo(stujiating1);
System.out.println(" ==================================================");
Stujiatinginfotb stujiating2 = new Stujiatinginfotb();
System.out.println(" student.getStujiatinginfo() : " + student.getStujiatinginfo());
stujiating2 = student.getStujiatinginfo();
stujiating2.setId(sid + "_2");
stujiating2.setSno(sno + "_2");
System.out.println(" stujiating2.sno : " + stujiating2.getSno());
System.out.println(" stujiating2.youbian : " + stujiating2.getYoubian());
stujiatinginfoDao.saveStujiatinginfo(stujiating2);
log.debug("保存学生家庭信息成功");
测试代码： @Test
public void testPutStudent() throws MyException {
StudentAll student = new StudentAll();
Stujiatinginfotb stujiatinginfo = new Stujiatinginfotb();
student.setStujiatinginfo(stujiatinginfo);
student.setName("zhangsan");
student.setSno("901");
boolean b = teacherService.putStudent(student);
System.out.println("return : " + b);
}
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stujiating1成功，stujiating2出在异常信息不成功
Stujiatinginfotb stujiating1 = new Stujiatinginfotb();
stujiating1.setId(sid + "_1");
stujiating1.setSno(sno + "_1");
stujiatinginfoDao.saveStujiatinginfo(stujiating1);
Stujiatinginfotb stujiating2 = new Stujiatinginfotb();
stujiating2 = student.getStujiatinginfo();
stujiating2.setId(sid + "_2");
stujiating2.setSno(sno + "_2");
stujiatinginfoDao.saveStujiatinginfo(stujiating2);
log.debug("保存学生家庭信息成功");
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System.out.println(” student.getStujiatinginfo() : ” + student.getStujiatinginfo());
stujiating2 = student.getStujiatinginfo(); 这2句有问题， 应该是用懒加载 获得student吧， 可能哪里用的不对 暂时没看出来 可以贴出 更详细的 如果仅仅 是为了保存 就去掉 这2句 应该可以 |
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org.hibernate.MappingException: Unknown
这种的话 可能是因为 你没有 映射文件 student的 可以仔细检查下~ 在hibernate.cfg.xml 里面 是否 配置了 |
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我没有配置懒加载这一项，默认的。去掉这两句就成stujiating1那样了，那样就可以成功的，就是不知道为什么。 |
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有映射文件，stujiating1是能保存成功的，如果没有映射文件stujiating1是不能保存成功的吧 |
 40分 |
加Q。可远程
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是不是邮编youbian字段的问题呢??
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我的892395619 |
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没有啊，那个只是我测试打印到控制台的信息，我测试的是能得到那个字段的信息的 |
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有没有能解决的、远程也可以，谢谢
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应该是懒加载的问题，在映射文件里加lazy=”””false”
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这个解决了，是因为我的这个StudentAll中定义几个实体，但没有new这个几个实体的对象，结果struts2自动对这几个实体new了对象，但new的是子类，和要用的实体不对应，所以出现了org.hibernate.MappingException: Unknown entity: com.xjgl.server.entity.Stujiatinginfotb$$EnhancerByCGLIB$$5d40c870（如果是自己new 的应该是Stujiatinginfotb而不是Stujiatinginfotb$$EnhancerByCGLIB$$5d40c870）
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