2

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。有一个 UserImpl 实体，它在上下文配置文件中声明为请求范围的 bean，并由 UsersController 引用。UsersController 引用的 UserImpl 对象实际上是一个 CGLib 代理（这是为什么？）。现在，当我第一次尝试使用 HibernateTemplate 持久化这样的代理对象时，我收到了这个错误：

org.hibernate.MappingException：未知实体：main.mvc.model.hibernate.UserImpl$$EnhancerByCGLIB$$9ac49631

经过一番搜索，我发现了类似的东西：

org.springframework.orm.hibernate3.support.ScopedBeanInterceptor

这有点解决了这个问题。现在我没有得到 MappingException 并且实体被持久化但是......数据库记录中的每个字段都是空的。有什么问题？

注意：当我对 UserImpl 实例进行硬编码并使用 UserServiceImpl 持久化它时，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>

用户控制器：

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";
    }
...
}

用户服务实现：

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，在 ScopedBeanInterceptor 中处理实体对象时会发生什么。它完好无损。虽然 Hibernate 的 BasicBinder 是绑定空值到 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
4

1 回答 1

1

“未知实体”位是因为默认情况下 Hibernate 只查看您传入的对象的类。Hibernate 不知道这个 Spring 增强类。在 Hibernate 条款中，您需要注册一个org.hibernate.EntityNameResolver合约以允许自定义实体名称解析。真的 Spring 可能应该注册它，但这是一个小细节；）

或者，您可以调用 save() et 的形式。人。接受实体名称。例如，而不是：

getHibernateTemplate().save( user );

改用这个：

getHibernateTemplate().save( User.class.getName(), user );

（假设 Spring 的 HibernateTemplate 实际上公开了这些方法，考虑到我对它们的模板类的经验，这实际上是一个很大的假设）。

于 2012-09-02T14:47:41.650 回答