报错：
@OneToOne or @ManyToOne on com.it.shop.model.Product.category references an unknown <em>entity</em>: com.it.shop.model.Category
1.检查hibernate.cfg.xml中是否做了mapping
mapping
class
="com.it.shop.
Adding @EntityScan( basePackages = {"com.prithvi.thoughtprocess.beans"} to your Application class. That is needed for hibernate to scan your entities.
今天遇到这个问题，通过各种百度了解解决，这个错误我是在查找返回list
然后调用删除方法时<em>出现</em>。
解决方案：
List list = hibernateTemplate.find(sb.to<em>String</em>());
for (T t : list) {
hibernateTemplate.delete(t);
}
因为删除只能用对象，所以一开始我是直接传list进去删除，这
环境：jpa2.0 +hibernate4.0 +spring3.2
代码截图：
报错信息
<em>java</em>.<em>lang</em>.IllegalArgumentException: <em>Unknown</em> <em>entity</em>: com.danaaa.shop.<em>entity</em>.Area
at org.hibernate.ejb.AbstractEntityManagerImpl.find(AbstractEntityManagerImpl.<em>java</em>:793)
at org.hibernate.ejb.AbstractEntityManagerImpl.find(AbstractEntityManagerImpl.<em>java</em>:756)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.<em>java</em>:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.<em>java</em>:43)
at <em>java</em>.<em>lang</em>.reflect.Method.invoke(Method.<em>java</em>:606)
at org.springframework.orm.jpa.SharedEntityManagerCreator$SharedEntityManagerInvocationHandler.invoke(SharedEntityManagerCreator.<em>java</em>:257)
at com.sun.proxy.$Proxy31.find(<em>Unknown</em> Source)
at com.danaaa.shop.dao.impl.BaseDaoImpl.find(BaseDaoImpl.<em>java</em>:69)
at com.danaaa.shop.service.impl.BaseServiceImpl.find(BaseServiceImpl.<em>java</em>:53)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.<em>java</em>:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.<em>java</em>:43)
at <em>java</em>.<em>lang</em>.reflect.Method.invoke(Method.<em>java</em>:606)
at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.<em>java</em>:317)
at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.<em>java</em>:190)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.<em>java</em>:157)
at org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.<em>java</em>:98)
at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.<em>java</em>:262)
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.<em>java</em>:95)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.<em>java</em>:179)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.<em>java</em>:207)
at com.sun.proxy.$Proxy80.find(<em>Unknown</em> Source)
at com.danashop.test.service.SuiteServiceImplTest.testAddSuiteToCart(SuiteServiceImplTest.<em>java</em>:106)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.<em>java</em>:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.<em>java</em>:43)
at <em>java</em>.<em>lang</em>.reflect.Method.invoke(Method.<em>java</em>:606)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.<em>java</em>:45)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.<em>java</em>:15)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.<em>java</em>:42)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.<em>java</em>:20)
at org.springframework.test.context.junit4.statements.RunBeforeTestMethodCallbacks.evaluate(RunBeforeTestMethodCallbacks.<em>java</em>:74)
at org.springframework.test.context.junit4.statements.RunAfterTestMethodCallbacks.evaluate(RunAfterTestMethodCallbacks.<em>java</em>:83)
at org.springframework.test.context.junit4.statements.<em>Spring</em>Repeat.evaluate(<em>Spring</em>Repeat.<em>java</em>:72)
at org.springframework.test.context.junit4.<em>Spring</em>JUnit4ClassRunner.runChild(<em>Spring</em>JUnit4ClassRunner.<em>java</em>:232)
at org.springframework.test.context.junit4.<em>Spring</em>JUnit4ClassRunner.runChild(<em>Spring</em>JUnit4ClassRunner.<em>java</em>:89)
at org.junit.runners.ParentRunner$3.run(ParentRunner.<em>java</em>:231)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.<em>java</em>:60)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.<em>java</em>:229)
at org.junit.runners.ParentRunner.access$000(ParentRunner.<em>java</em>:50)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.<em>java</em>:222)
at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.<em>java</em>:61)
at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.<em>java</em>:71)
at org.junit.runners.ParentRunner.run(ParentRunner.<em>java</em>:300)
at org.springframework.test.context.junit4.<em>Spring</em>JUnit4ClassRunner.run(<em>Spring</em>JUnit4ClassRunner.<em>java</em>:175)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.<em>java</em>:50)
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.<em>java</em>:38)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.<em>java</em>:467)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.<em>java</em>:683)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.<em>java</em>:390)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.<em>java</em>:197)
Caused by: org.hibernate.MappingException: <em>Unknown</em> <em>entity</em>: com.danaaa.shop.<em>entity</em>.Area
at org.hibernate.impl.SessionFactoryImpl.getEntityPersister(SessionFactoryImpl.<em>java</em>:693)
at org.hibernate.event.def.DefaultLoadEventListener.onLoad(DefaultLoadEventListener.<em>java</em>:92)
at org.hibernate.impl.SessionImpl.fireLoad(SessionImpl.<em>java</em>:1090)
at org.hibernate.impl.SessionImpl.get(SessionImpl.<em>java</em>:1005)
at org.hibernate.impl.SessionImpl.get(SessionImpl.<em>java</em>:998)
at org.hibernate.ejb.AbstractEntityManagerImpl.find(AbstractEntityManagerImpl.<em>java</em>:781)
... 51 more
问题一：
MyEclipse2016 第一次配置，项目右键new里没有<em>Hibernate</em> XML Mapping File，与教程上不同解决方法：
新建XML（Basic Templates），创建过程中命名为TableName.hbm.xml，选取Create XML file from a DTD file,在select XML Catalog entry 中 选取<em>Hibernate</em> Ma
网上这个错误的解决方法很多，我都试过了但是没有一个行的，确认我的配置文件没写错，请问是什么问题？
**报错**
Exception in thread "main" org.hibernate.MappingException: <em>Unknown</em> <em>entity</em>: com.hibernate.Student
at org.hibernate.internal.SessionFactoryImpl.getEntityPersister(SessionFactoryImpl.<em>java</em>:781)
at org.hibernate.internal.SessionImpl.getEntityPersister(SessionImpl.<em>java</em>:1520)
at org.hibernate.event.internal.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.<em>java</em>:100)
at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.saveWithGeneratedOrRequestedId(DefaultSaveOrUpdateEventListener.<em>java</em>:192)
at org.hibernate.event.internal.DefaultSaveEventListener.saveWithGeneratedOrRequestedId(DefaultSaveEventListener.<em>java</em>:38)
at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.<em>entity</em>IsTransient(DefaultSaveOrUpdateEventListener.<em>java</em>:177)
at org.hibernate.event.internal.DefaultSaveEventListener.performSaveOrUpdate(DefaultSaveEventListener.<em>java</em>:32)
at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.<em>java</em>:73)
at org.hibernate.internal.SessionImpl.fireSave(SessionImpl.<em>java</em>:679)
at org.hibernate.internal.SessionImpl.save(SessionImpl.<em>java</em>:671)
at org.hibernate.internal.SessionImpl.save(SessionImpl.<em>java</em>:666)
at com.hibernateservice.StudentTest.main(StudentTest.<em>java</em>:33)
**hibernate.cfg.xml:**
```
<!DOCTYPE hibernate-configuration PUBLIC
"-//<em>Hibernate</em>/<em>Hibernate</em> Configuration DTD 3.0//EN"
"dtd/hibernate-configuration-3.0.dtd">
com.mysql.jdbc.Driver
1234
jdbc:mysql://localhost:3306/hibernate
root
org.hibernate.dialect.MySQL5Dialect
true
update
```
**Student.hbm.xml**
```
<!DOCTYPE hibernate-mapping PUBLIC "-//<em>Hibernate</em>/<em>Hibernate</em> Mapping DTD 3.0//EN"
"dtd/hibernate-mapping-3.0.dtd">
```
**Student.<em>java</em>:**
```
package com.hibernate;
public class Student {
int id;
<em>String</em> name;
/**
* @return the id
*/
public long getId() {
return id;
}
/**
* @param id the id to set
*/
public void setId(int id) {
this.id = id;
}
/**
* @return the name
*/
public <em>String</em> getName() {
return name;
}
/**
* @param name the name to set
*/
public void setName(<em>String</em> name) {
this.name = name;
}
public Student() {
// TODO Auto-generated constructor stub
}
}
```
**StudentTest.<em>java</em>:**
```
package com.hibernateservice;
import com.hibernate.Student;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.boot.registry.StandardServiceRegistryBuilder;
import org.hibernate.cfg.Configuration;
public class StudentTest {
public StudentTest() {
// TODO Auto-generated constructor stub
}
public static void main(<em>String</em>[] args) {
Configuration config = new Configuration().configure();
org.hibernate.service.ServiceRegistry registry =
new StandardServiceRegistryBuilder().applySettings(config.getProperties()).build();
SessionFactory sessionFactory = config.buildSessionFactory(registry);
Session session = sessionFactory.openSession();
session.beginTransaction();
Student s = new Student();
s.setName("张三");
s.setId(0);
session.save(s);
session.getTransaction().commit();
session.close();
sessionFactory.close();
}
}
```
**目录:**
org.hibernate.MappingException: <em>Unknown</em> <em>entity</em>: com.greatchn.<em>entity</em>.Task
at org.hibernate.internal.SessionFactoryImpl.getEntityPersister(SessionFactoryImpl.<em>java</em>:1096)
at org.hibernate.internal.Sess...
谢谢大家了，帮帮忙。
测试了好多次，一直报错<em>Unknown</em> <em>entity</em>:
配置文件
user.bhm.xml
配置文件hibernate.cfg.xml
com.mysql.jdbc.Driver
jdbc:mysql://localhost:3306/testhibernate
root
123456
org.hibernate.dialect.MySQLDialect
实体类User
public class User {
private int id;
private <em>String</em> username;
private <em>String</em> password;
//get set 方法
}
main方法
public static void main(<em>String</em>[] args) {
Configuration cfg = new Configuration().configure();
ServiceRegistry registery = new StandardServiceRegistryBuilder().applySettings(cfg.getProperties()).build();
SessionFactory sf = cfg.buildSessionFactory(registery);
Session session = sf.openSession();
Transaction tx = session.beginTransaction();
User user = new User();
user.setUsername("测试");
user.setPassword("123");
session.save(user);//出问题的语句
tx.commit();
session.close();
}
异常信息如下：
Exception in thread "main" org.hibernate.MappingException: <em>Unknown</em> <em>entity</em>: com.lzm.beans.User
at org.hibernate.metamodel.internal.MetamodelImpl.<em>entity</em>Persister(MetamodelImpl.<em>java</em>:620)
at org.hibernate.internal.SessionImpl.getEntityPersister(SessionImpl.<em>java</em>:1596)
at org.hibernate.event.internal.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.<em>java</em>:104)
at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.saveWithGeneratedOrRequestedId(DefaultSaveOrUpdateEventListener.<em>java</em>:192)
at org.hibernate.event.internal.DefaultSaveEventListener.saveWithGeneratedOrRequestedId(DefaultSaveEventListener.<em>java</em>:38)
at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.<em>entity</em>IsTransient(DefaultSaveOrUpdateEventListener.<em>java</em>:177)
at org.hibernate.event.internal.DefaultSaveEventListener.performSaveOrUpdate(DefaultSaveEventListener.<em>java</em>:32)
at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.<em>java</em>:73)
at org.hibernate.internal.SessionImpl.fireSave(SessionImpl.<em>java</em>:668)
at org.hibernate.internal.SessionImpl.save(SessionImpl.<em>java</em>:660)
at org.hibernate.internal.SessionImpl.save(SessionImpl.<em>java</em>:655)
at com.lzm.test.Test.main(Test.<em>java</em>:23)
测试了好多次，一直报错<em>Unknown</em> <em>entity</em>: com.lzm.beans.User
第一个hibernate程序就出错，大神门帮帮忙啊。
最近用JPA遇到这样一个问题：Repeated column in mapping for <em>entity</em>: com.ketayao.security.<em>entity</em>.main.User column: org_id (should be mapped with insert="false" update="false")
这个错误是由实体类引起的，我一开始是这样写的：
@Column
priv
[org.jeecgframework.core.common.exception.GlobalExceptionResolver]全局处理异常
property mapping has wrong number of columns: com.admin.<em>entity</em>.message.messageEntity;
按照异常提示caused by:我的一方面是注解反回Object失败，便把
今天在配置一对多关系的时候<em>出现</em>了以下异常：
org.hibernate.MappingException: Repeated column in mapping for <em>entity</em>com.lrq.<em>entity</em>.Pets column: petsId (should be mapped with insert="false" update="false")
主要原因是mapping
异常提示：Servlet.service() for servlet [dispatcher] in context with path [/comsed1] threw exception [Request processing failed; nested exception is org.springframework.dao.InvalidDataAccessApiUsageException: Bean object must not be null; nested exception is <em>java</em>.<em>lang</em>.IllegalArgumentException: Bean object must not be null] with root cause
<em>java</em>.<em>lang</em>.IllegalArgumentException: Bean object must not be null
at org.springframework.util.Assert.notNull(Assert.<em>java</em>:112)
at org.springframework.beans.BeanWrapperImpl.setWrappedInstance(BeanWrapperImpl.<em>java</em>:213)
at org.springframework.beans.BeanWrapperImpl.setWrappedInstance(BeanWrapperImpl.<em>java</em>:202)
at org.springframework.beans.BeanWrapperImpl.(BeanWrapperImpl.<em>java</em>:151)
at org.springframework.data.util.DirectFieldAccessFallbackBeanWrapper.(DirectFieldAccessFallbackBeanWrapper.<em>java</em>:35)
at org.springframework.data.jpa.repository.support.JpaMetamodelEntityInformation.getId(JpaMetamodelEntityInformation.<em>java</em>:117)
at org.springframework.data.repository.core.support.AbstractEntityInformation.isNew(AbstractEntityInformation.<em>java</em>:51)
at org.springframework.data.jpa.repository.support.JpaMetamodelEntityInformation.isNew(JpaMetamodelEntityInformation.<em>java</em>:196)
at org.springframework.data.jpa.repository.support.SimpleJpaRepository.save(SimpleJpaRepository.<em>java</em>:376)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.<em>java</em>:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.<em>java</em>:43)
at <em>java</em>.<em>lang</em>.reflect.Method.invoke(Method.<em>java</em>:483)
at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.executeMethodOn(RepositoryFactorySupport.<em>java</em>:405)
at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.doInvoke(RepositoryFactorySupport.<em>java</em>:390)
at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.invoke(RepositoryFactorySupport.<em>java</em>:344)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.<em>java</em>:179)
at org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.<em>java</em>:98)
at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.<em>java</em>:262)
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.<em>java</em>:95)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.<em>java</em>:179)
at org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.<em>java</em>:136)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.<em>java</em>:179)
at org.springframework.data.jpa.repository.support.CrudMethodMetadataPostProcessor$CrudMethodMetadataPopulatingMethodIntercceptor.invoke(CrudMethodMetadataPostProcessor.<em>java</em>:111)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.<em>java</em>:179)
at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.<em>java</em>:92)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.<em>java</em>:179)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.<em>java</em>:207)
at com.sun.proxy.$Proxy136.save(<em>Unknown</em> Source)
at iot.service.ProductMasterService.modifyProductMaster(ProductMasterService.<em>java</em>:32)
at iot.controller.productMasterController.modifyProductMaster(productMasterController.<em>java</em>:95)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.<em>java</em>:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.<em>java</em>:43)
代码部分：
@RequestMapping(value = "modifyProductMasterInit")
public <em>String</em> modifyProductMasterInit(@RequestParam("productId") <em>String</em> productId,Model model){
// Iterable productMasterList = productMasterDAO.findByProductId(productId);
// model.addAttribute("productMasterList", productMasterList);
ProductMaster productMaster = this.productMasterService.findByProductId(productId);
model.addAttribute("productMaster", productMaster);
return "productMaster/Pro_Master_modify";
}
@RequestMapping(value = "modifyProductMaster")
public <em>String</em> modifyProductMaster(ProductMaster productMaster,@RequestParam("productId") <em>String</em> productId){
ProductMaster productMasterOld = this.productMasterService.findByProductId(productId);//经断点调试productMasterOld为空
try {
BeanUtils.copyProperties(productMaster, productMasterOld);
} catch (Exception e) {
e.printStackTrace();
}
this.productMasterService.modifyProductMaster(productMasterOld);
return "redirect:/productMaster/loadProductMaster";
}
Service方法：
@Service
public class ProductMasterService {
@Autowired(required = false)
private ProductMasterDAO productMasterDAO;
public void addproductMaster(ProductMaster productMaster) {
this.productMasterDAO.save(productMaster);
}
public ProductMaster findByProductId(<em>String</em> productId) {
return this.productMasterDAO.findByProductId(productId);
}
public void modifyProductMaster(ProductMaster productMaster) {
this.productMasterDAO.save(productMaster);
}
}
ProductMasterDAO部分：
public interface ProductMasterDAO extends PagingAndSortingRepository,JpaSpecificationExecutor{
@Query("SELECT p FROM ProductMaster p WHERE p.productId = ?1")
public ProductMaster findByProductId(<em>String</em> productId);
}
<em>java</em>.<em>lang</em>.ClassCastException: <em>entity</em>.User cannot be cast to <em>java</em>.<em>lang</em>.<em>String</em> org.hibernate.type.Stri
首先跟大家说明一点，我们做 IT 类的外包开发，是非标品开发，所以很有可能在开发过程中会有这样那样的需求修改，而这种需求修改很容易造成扯皮，进而影响到费用支付，甚至<em>出现</em>做完了项目收不到钱的情况。
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