java - Spring项目中的org.springframework.beans.NotWritablePropertyException

Question

我正在尝试创建一个带有 CRUD 操作的 Spring 项目。我是 Spring 的新手，所以我需要一些帮助-

我在使用 post 方法提交表单时遇到以下错误-

Caused by: org.springframework.beans.NotWritablePropertyException: Invalid property 'userDao' of bean class [com.cjc.service.RegistrationServiceImpl]: Bean property 'userDao' is not writable or has an invalid setter method. Does the parameter type of the setter match the return type of the getter? at org.springframework.beans.BeanWrapperImpl.createNotWritablePropertyException(BeanWrapperImpl.java:231) at org.springframework.beans.AbstractNestablePropertyAccessor.setPropertyValue(AbstractNestablePropertyAccessor.java:423) at org.springframework.beans.AbstractNestablePropertyAccessor.setPropertyValue(AbstractNestablePropertyAccessor.java:280) at org.springframework.beans.AbstractPropertyAccessor.setPropertyValues(AbstractPropertyAccessor.java:95) at org.springframework.beans.AbstractPropertyAccessor.setPropertyValues(AbstractPropertyAccessor.java:75) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyPropertyValues(AbstractAutowireCapableBeanFactory.java:1514) ... 47 more

Jan 23, 2019 9:01:09 AM org.apache.catalina.core.StandardWrapperValve invoke SEVERE: Allocate exception for servlet spring org.springframework.beans.NotWritablePropertyException: Invalid property 'userDao' of bean class [com.cjc.service.RegistrationServiceImpl]: Bean property 'userDao' is not writable or has an invalid setter method. Does the parameter type of the setter match the return type of the getter? at org.springframework.beans.BeanWrapperImpl.createNotWritablePropertyException(BeanWrapperImpl.java:231) at org.springframework.beans.AbstractNestablePropertyAccessor.setPropertyValue(AbstractNestablePropertyAccessor.java:423) at org.springframework.beans.AbstractNestablePropertyAccessor.setPropertyValue(AbstractNestablePropertyAccessor.java:280) at org.springframework.beans.AbstractPropertyAccessor.setPropertyValues(AbstractPropertyAccessor.java:95) at org.springframework.beans.AbstractPropertyAccessor.setPropertyValues(AbstractPropertyAccessor.java:75) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyPropertyValues(AbstractAutowireCapableBeanFactory.java:1514) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1226) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:543) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:482) at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:305) at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230) at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:301) at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:196) at org.springframework.beans.factory.support.DefaultListableBeanFactory.findAutowireCandidates(DefaultListableBeanFactory.java:1192) at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1116) at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1014) at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:543) at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:88) at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:331) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1214) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:543) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:482) at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:305) at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230) at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:301) at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:196) at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:772)

请在下面找到相同的 java 文件-

Controller -

package com.cjc.controller;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;

import com.cjc.model.User;
import com.cjc.service.RegistrationService;

@Controller
public class RegistrationController {
    @Qualifier("regservice")
    private RegistrationService registrationService;

    public void setRegistrationService(RegistrationService registrationService) {
        this.registrationService = registrationService;
    }

    @RequestMapping(value="/registration", method=RequestMethod.POST)
    public String Registration(@ModelAttribute User u) {
        registrationService.addPerson(u);

        return "RegSuccess";
    }
}

服务-

package com.cjc.service;

import com.cjc.dao.UserDAO;
import com.cjc.model.User;

public class RegistrationServiceImpl implements RegistrationService {

    private UserDAO userDao ;

    public void setUserDao(UserDAO userDao) {
        this.userDao = userDao;
    }



    @Override
    public int addPerson(User u) {
        // TODO Auto-generated method stub

        return 0;
    }

}

DAO 实现-

package com.cjc.dao;

import java.util.List;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;

import com.cjc.model.User;
import com.cjc.util.HibernateUtil;

public class UserDaoImpl implements UserDAO{

    @Override
    public void addUser(User u) {
        // TODO Auto-generated method stub
        SessionFactory sessionFactory=HibernateUtil.getSessionFactory();
        Session session=sessionFactory.openSession();
        Transaction transaction=session.beginTransaction();

        session.save(u);

        transaction.commit();
    }

    @Override
    public void deleteUser(int id) {
        // TODO Auto-generated method stub

    }

    @Override
    public List<User> getAllUser() {
        // TODO Auto-generated method stub
        return null;
    }

    @Override
    public User getUserById(int id) {
        // TODO Auto-generated method stub
        return null;
    }

    @Override
    public void updteUser(User u, int id) {
        // TODO Auto-generated method stub

    }

}

Spring-servlet.xml

<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:context="http://www.springframework.org/schema/context"
    xsi:schemaLocation="
                http://www.springframework.org/schema/beans
                http://www.springframework.org/schema/beans/spring-beans.xsd
                http://www.springframework.org/schema/context
                http://www.springframework.org/schema/context/spring-context.xsd

                http://www.springframework.org/schema/beans
                http://www.springframework.org/schema/beans/spring-beans.xsd
                http://www.springframework.org/schema/mvc
                http://www.springframework.org/schema/mvc/spring-mvc.xsd">

    <mvc:annotation-driven />
    <context:component-scan base-package="com.cjc.controller" />
<bean id="userDAO" class="com.cjc.dao.UserDaoImpl">
    </bean>
    <bean id="regservice" class="com.cjc.service.RegistrationServiceImpl">
        <property name="userDao" ref="userDAO"></property>
    </bean>



    <bean id="viewResolver"
        class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/jsp/"></property>
        <property name="suffix" value=".jsp"></property>

    </bean>

    <bean id="messageSource"
        class="org.springframework.context.support.ResourceBundleMessageSource">

        <property name="basenames" value="application" />
    </bean>
</beans>

请帮我解决这个问题

Answer 1

您在用户模型中缺少 setter 和 getter。添加 setter 和 getter。