做SSH项目出现：org.hibernate.MappingException: Unknown entity:

[lingfeng892]

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：
异常信息：

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：
其中：stujiating1 能保存成功，stujiating2不能保存成功，异常信息就是在保存stujiating2时出现的

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);
	}

[lingfeng892]

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");

[qq840727854]

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

[qq840727854]

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

[lingfeng892]

引用 2 楼 qq840727854 的回复:

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

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。 你说的更详细信息是指哪些信息？

[lingfeng892]

引用 3 楼 qq840727854 的回复:

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

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

[lingfeng892]

引用 6 楼 qq840727854 的回复:

加Q。可远程

我的892395619

[lingfeng892]

引用 7 楼 zhjiqiuanng 的回复:

是不是邮编youbian字段的问题呢??

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

[qq840727854]

加Q。可远程

[可比克_zhjq]

是不是邮编youbian字段的问题呢??

[lingfeng892]

有没有能解决的、远程也可以，谢谢

[五月树]

应该是懒加载的问题，在映射文件里加lazy="'false"

[lingfeng892]

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）