我几乎到处搜索，但似乎没有人遇到这个问题。 我有Spring MVC应用程序。 UserImpl实体在上下文配置文件中声明为请求范围bean，并由UsersController引用。 UsersController引用的UserImpl对象实际上是一个CGLib代理（here是什么原因？）。现在，当我第一次尝试使用HibernateTemplate保留这样的代理对象时，我遇到了这个错误：
org.hibernate.MappingException：未知实体： main.mvc.model.hibernate.UserImpl $$ EnhancerByCGLIB $$ 9ac49631
经过一番搜索，我找到了类似的东西：
org.springframework.orm.hibernate3.support.ScopedBeanInterceptor
哪一种解决了这个问题。现在我没有获取MappingException并且实体是持久的但是......数据库记录中的每个字段都为null。有什么问题？
注意： 当我对UserImpl实例进行硬编码并使用UserServiceImpl持久化时，一切正常。
上下文配置的一部分：
<bean id="userService" class="main.mvc.model.hibernate.UserServiceImpl"/>
<bean id="userValidator" class="main.validators.UserValidator"/>
<bean id="userWrapperValidator" class="main.validators.UserWrapperValidator"/>
<bean id="user" class="main.mvc.model.hibernate.UserImpl" scope="request">
<aop:scoped-proxy/>
</bean>
<bean id="sessionFactory" class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean">
<property name="dataSource" ref="dataSource"/>
<property name="packagesToScan" value="main.mvc.model.hibernate"/>
<property name="entityInterceptor">
<bean class="org.springframework.orm.hibernate3.support.ScopedBeanInterceptor"/>
</property>
<property name="hibernateProperties">
<props>
<prop key="hibernate.dialect">org.hibernate.dialect.HSQLDialect</prop>
<prop key="hibernate.show_sql">true</prop>
<prop key="hibernate.hbm2ddl.auto">update</prop>
</props>
</property>
</bean>
UsersController：
package main.mvc.controllers;
import java.util.List;
import javax.inject.Inject;
import javax.validation.Valid;
import main.helpers.UserWrapper;
import main.mvc.model.User;
import main.mvc.model.UserService;
import main.mvc.model.hibernate.UserImpl;
import main.validators.UserValidator;
import main.validators.UserWrapperValidator;
import org.apache.log4j.Logger;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.validation.BindingResult;
import org.springframework.web.bind.WebDataBinder;
import org.springframework.web.bind.annotation.InitBinder;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.servlet.mvc.support.RedirectAttributes;
@Controller
@RequestMapping("/users")
public class UsersController {
private User user; // should be request-scoped
private UserService userService;
private UserValidator userValidator;
private UserWrapperValidator userWrapperValidator;
@SuppressWarnings("unused")
private Logger logger = Logger.getLogger(getClass());
@Inject
public UsersController(User user, UserService userService, UserValidator userValidator, UserWrapperValidator userWrapperValidator){
this.user = user;
this.userService = userService;
this.userValidator = userValidator;
this.userWrapperValidator = userWrapperValidator;
}
@InitBinder("user")
protected void setUserValidator(WebDataBinder binder){
binder.setValidator(userValidator);
}
@InitBinder("userWrapper")
protected void setUserWrapperValidator(WebDataBinder binder){
binder.setValidator(userWrapperValidator);
}
@ModelAttribute
public UserWrapper wrapUser(){
return new UserWrapper(user);
}
//==================================REQUEST HANDLERS==========================================
@RequestMapping(value={"/new"}, method=RequestMethod.GET)
public String showCreationForm(@ModelAttribute UserWrapper userWrapper){
return "user_registration_form";
}
@RequestMapping(method=RequestMethod.POST)
public String createUser(@Valid @ModelAttribute UserWrapper userWrapper, BindingResult bindingResult, RedirectAttributes redirectAttributes){
if(bindingResult.hasErrors()){
return "user_registration_form";
}
userService.save(userWrapper.getUser());
redirectAttributes.addFlashAttribute("message_title", "Jakiś text");
redirectAttributes.addFlashAttribute("message_text", "Jakiś text");
redirectAttributes.addFlashAttribute("redirect_url", "/users");
return "redirect:information";
}
...
}
UserServiceImpl：
public class UserServiceImpl extends HibernateDaoSupport implements UserService {
private PasswordEncoder passwordEncoder;
private SaltSource saltSource;
@Inject
public UserServiceImpl(SessionFactory sessionFactory, PasswordEncoder passwordEncoder, SaltSource saltSource) {
super();
setSessionFactory(sessionFactory);
setPasswordEncoder(passwordEncoder);
setSaltSource(saltSource);
}
public void save(User user) {
Date creationTime = new Date();
user.setCreationDate(creationTime);
user.setLastModified(creationTime);
List<Role> roles = new LinkedList<>();
roles.add(Role.ROLE_USER);
user.setRoles(roles);
Logger.getLogger(getClass()).info(user);
getHibernateTemplate().save(user);
}
...
}
更新
好的，所以我添加了一些AOP魔术添加输出，当在ScoppedBeanInterceptor中处理时，实体对象会发生什么。它完好无损。虽然Hibernate的BasicBinder将空值绑定到SQL语句。有什么帮助吗？
日志：
11:27:51,866 DEBUG org.hibernate.SQL:111 - select userimpl0_.id as id1_, userimpl0_.creationDate as creation2_1_, userimpl0_.lastModified as lastModi3_1_, userimpl0_.city as city1_, userimpl0_.country as country1_, userimpl0_.latitude as latitude1_, userimpl0_.longitude as longitude1_, userimpl0_.postalCode as postalCode1_, userimpl0_.street as street1_, userimpl0_.birthDate as birthDate1_, userimpl0_.firstName as firstName1_, userimpl0_.secondName as secondName1_, userimpl0_.sex as sex1_, userimpl0_.surName as surName1_, userimpl0_.alias as alias1_, userimpl0_.enabled as enabled1_, userimpl0_.loginEmail as loginEmail1_, userimpl0_.password as password1_, userimpl0_.preferences_id as prefere19_1_ from TBL_USER userimpl0_ where userimpl0_.loginEmail=?
11:27:51,878 TRACE org.hibernate.type.descriptor.sql.BasicBinder:81 - binding parameter [1] as [VARCHAR] - blady_the_best@o2.pl
11:27:52,009 INFO hsqldb.db.HSQLDB39E3504C79.ENGINE:? - Database closed
11:27:52,225 DEBUG org.hibernate.SQL:111 - select userimpl0_.id as id1_, userimpl0_.creationDate as creation2_1_, userimpl0_.lastModified as lastModi3_1_, userimpl0_.city as city1_, userimpl0_.country as country1_, userimpl0_.latitude as latitude1_, userimpl0_.longitude as longitude1_, userimpl0_.postalCode as postalCode1_, userimpl0_.street as street1_, userimpl0_.birthDate as birthDate1_, userimpl0_.firstName as firstName1_, userimpl0_.secondName as secondName1_, userimpl0_.sex as sex1_, userimpl0_.surName as surName1_, userimpl0_.alias as alias1_, userimpl0_.enabled as enabled1_, userimpl0_.loginEmail as loginEmail1_, userimpl0_.password as password1_, userimpl0_.preferences_id as prefere19_1_ from TBL_USER userimpl0_ where userimpl0_.alias=?
11:27:52,230 TRACE org.hibernate.type.descriptor.sql.BasicBinder:81 - binding parameter [1] as [VARCHAR] - Bladositto
11:27:52,346 INFO hsqldb.db.HSQLDB39E3504C79.ENGINE:? - Database closed
11:27:52,470 INFO model.hibernate.UserServiceImpl:50 - User[id: null loginEmail: blady_the_best@o2.pl alias: Bladositto password: asdasd] class type:class model.hibernate.UserImpl$$EnhancerByCGLIB$$536b42dd
11:27:52,481 INFO helpers.EntityAuditor:13 - User[id: null loginEmail: blady_the_best@o2.pl alias: Bladositto password: asdasd]
11:27:52,483 INFO helpers.EntityAuditor:13 - User[id: null loginEmail: blady_the_best@o2.pl alias: Bladositto password: asdasd]
11:27:52,581 DEBUG org.hibernate.SQL:111 - insert into TBL_USER (id, creationDate, lastModified, city, country, latitude, longitude, postalCode, street, birthDate, firstName, secondName, sex, surName, alias, enabled, loginEmail, password, preferences_id) values (default, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
11:27:52,587 TRACE org.hibernate.type.descriptor.sql.BasicBinder:70 - binding parameter [1] as [TIMESTAMP] - <null>
11:27:52,589 TRACE org.hibernate.type.descriptor.sql.BasicBinder:70 - binding parameter [2] as [TIMESTAMP] - <null>
11:27:52,590 TRACE org.hibernate.type.descriptor.sql.BasicBinder:70 - binding parameter [3] as [VARCHAR] - <null>
11:27:52,604 TRACE org.hibernate.type.descriptor.sql.BasicBinder:70 - binding parameter [4] as [VARCHAR] - <null>
11:27:52,606 TRACE org.hibernate.type.descriptor.sql.BasicBinder:70 - binding parameter [5] as [DOUBLE] - <null>
11:27:52,609 TRACE org.hibernate.type.descriptor.sql.BasicBinder:70 - binding parameter [6] as [DOUBLE] - <null>
11:27:52,610 TRACE org.hibernate.type.descriptor.sql.BasicBinder:70 - binding parameter [7] as [VARCHAR] - <null>
11:27:52,611 TRACE org.hibernate.type.descriptor.sql.BasicBinder:70 - binding parameter [8] as [VARCHAR] - <null>
11:27:52,612 TRACE org.hibernate.type.descriptor.sql.BasicBinder:70 - binding parameter [9] as [DATE] - <null>
11:27:52,614 TRACE org.hibernate.type.descriptor.sql.BasicBinder:70 - binding parameter [10] as [VARCHAR] - <null>
11:27:52,615 TRACE org.hibernate.type.descriptor.sql.BasicBinder:70 - binding parameter [11] as [VARCHAR] - <null>
11:27:52,616 DEBUG org.hibernate.type.EnumType:136 - Binding null to parameter: 12
11:27:52,618 TRACE org.hibernate.type.descriptor.sql.BasicBinder:70 - binding parameter [13] as [VARCHAR] - <null>
11:27:52,619 TRACE org.hibernate.type.descriptor.sql.BasicBinder:70 - binding parameter [14] as [VARCHAR] - <null>
11:27:52,621 TRACE org.hibernate.type.descriptor.sql.BasicBinder:70 - binding parameter [15] as [BIT] - <null>
11:27:52,621 TRACE org.hibernate.type.descriptor.sql.BasicBinder:70 - binding parameter [16] as [VARCHAR] - <null>
11:27:52,623 TRACE org.hibernate.type.descriptor.sql.BasicBinder:70 - binding parameter [17] as [VARCHAR] - <null>
11:27:52,625 TRACE org.hibernate.type.descriptor.sql.BasicBinder:70 - binding parameter [18] as [BIGINT] - <null>
11:27:52,767 INFO hsqldb.db.HSQLDB39E3504C79.ENGINE:? - Database closed
答案 0 :(得分：1)
“未知实体”位是因为默认情况下Hibernate只会查看您传入的对象的类.Hibernate不知道这个Spring增强类。在Hibernate术语中，您需要注册org.hibernate.EntityNameResolver，这是允许自定义实体名称解析的合同。真的Spring应该注册它，但那是一个小细节;）
或者你可以调用save（）et的形式。人。接受实体名称。例如，而不是：
getHibernateTemplate().save( user );
改为使用：
getHibernateTemplate().save( User.class.getName(), user );
（假设Spring的HibernateTemplate实际上暴露了这些方法，考虑到我对模板类的经验，这实际上是一个很大的假设。）