Java spring mvc@Autowired error未满足要求'；必需的'；类型依赖关系

我有处理用户实体的用户服务，在使用用户服务之前，@Autowired在用户控制器类中。所以，我得到了一个错误：

类型为[class com.yes.service.UserService]的未满足的“必需”依赖项。至少需要1个匹配bean

代码如下：

用户服务

package com.yes.service;

import java.util.List;
import java.util.UUID;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import com.yes.domain.User;
import com.yes.repository.RoleRepository;
import com.yes.repository.UserRepository;

@Service
public class UserService {


    @Autowired
    private UserRepository userRepository;
    @Autowired
    private RoleRepository roleRepository;

    public User create(User user) {
        user.setId(UUID.randomUUID().toString());
        user.getRole().setId(UUID.randomUUID().toString());
        // We must save both separately since there is no cascading feature
        // in Spring Data MongoDB (for now)
        roleRepository.save(user.getRole());
        return userRepository.save(user);
    }
    public User read(User user) {
        return user;
    }
    public List<User> readAll() {
        return userRepository.findAll();
    }
    public User update(User user) {
        User existingUser = userRepository.findByUsername(user.getUserName());
        if (existingUser == null) {
            return null;
        }
        existingUser.setFirstName(user.getFirstName());
        existingUser.setLastName(user.getLastName());
        existingUser.getRole().setRole(user.getRole().getRole());
        // We must save both separately since there is no cascading feature
        // in Spring Data MongoDB (for now)
        roleRepository.save(existingUser.getRole());
        return userRepository.save(existingUser);
    }
    public Boolean delete(User user) {
        User existingUser = userRepository.findByUsername(user.getUserName());
        if (existingUser == null) {
            return false;
        }
        // We must delete both separately since there is no cascading feature
        // in Spring Data MongoDB (for now)
        roleRepository.delete(existingUser.getRole());
        userRepository.delete(existingUser);
        return true;
    }
}

spring-data.xml

    <?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p"
    xmlns:c="http://www.springframework.org/schema/c" xmlns:tx="http://www.springframework.org/schema/tx"
    xmlns:context="http://www.springframework.org/schema/context"
    xmlns:mongo="http://www.springframework.org/schema/data/mongo"
    xmlns:util="http://www.springframework.org/schema/util"
    xsi:schemaLocation="
http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.1.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx-3.1.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-3.1.xsd
http://www.springframework.org/schema/data/mongo
http://www.springframework.org/schema/data/mongo/spring-mongo-1.0.xsd
http://www.springframework.org/schema/util
http://www.springframework.org/schema/util/spring-util-3.1.xsd">

    <context:property-placeholder
        properties-ref="deployProperties" />


    <!-- MongoDB host -->
    <mongo:mongo host="${mongo.host.name}" port="${mongo.host.port}" />

    <!-- Template for performing MongoDB operations -->
    <bean id="mongoTemplate" class="org.springframework.data.mongodb.core.MongoTemplate"
        c:mongo-ref="mongo" c:databaseName="${mongo.db.name}" />

    <!-- Activate Spring Data MongoDB repository support -->
    <mongo:repositories base-package="com.yes.repository" mongo-template-ref="mongoTemplate"/>



    <!-- Service for initializing MongoDB with sample data using MongoTemplate -->
    <bean id="initMongoService" class="com.yes.service.InitMongoService" init-method="init"/>
</beans>

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">

    <!-- The definition of the Root Spring Container shared by all Servlets and Filters -->
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>/WEB-INF/spring/applicationContext.xml</param-value>
    </context-param>

    <!-- Creates the Spring Container shared by all Servlets and Filters -->
    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>

    <!-- Processes application requests -->
    <servlet>
        <servlet-name>appServlet</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>/WEB-INF/spring/appServlet/servlet-context.xml</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>

    <servlet-mapping>
        <servlet-name>appServlet</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>

</web-app>

上下文配置位置
/WEB-INF/spring/applicationContext.xml
org.springframework.web.context.ContextLoaderListener
appServlet
org.springframework.web.servlet.DispatcherServlet
上下文配置位置
/WEB-INF/spring/appServlet/servlet-context.xml
1.
appServlet
/

编辑：问题是在修复了Sotirios Delimanolis回答和评论中的错误后提出的

导致错误的问题是什么

回答：问题是索蒂里奥斯·德里马诺利斯回答中描述的。在对其答案的评论中描述的确切解决方案

---

谢谢

您的应用程序上下文和servlet上下文正在对相同的包进行组件扫描

您的应用程序上下文

<context:component-scan base-package="com.yes" />

与servlet上下文中的所有内容相比

<context:component-scan base-package="com.yes.service"/>
<context:component-scan base-package="com.yes.controller"/>
<context:component-scan base-package="com.yes.domain"/>
<context:component-scan base-package="com.yes.repository"/>
<context:component-scan base-package="com.yes.dto"/>

---

因此，一些bean将被覆盖。你不会想要这个的。servlet上下文应该扫描

@Controller

bean。应用程序上下文应该扫描所有其他内容，但不要让应用程序上下文扫描子（导入的）数据上下文已经扫描的内容。修复您的包声明，使所有这些声明不相交。

为什么您有这么多

mongo:repositories

条目？只保留第一个。另外两个正在声明不存在的包。@SotiriosDelimanolis谢谢。我删除该声明。但问题还在这里…再次感谢你。除了留在那里的

和userService中解决的问题之外，我将所有的

上下文：组件扫描

从servlet上下文转移到ApplicationContext，而不是旧的。。。，我能做什么？@yoni用新的上下文编辑您的上述问题。@yoni尝试从应用程序上下文中删除

。spring数据上下文已经扫描了该包。如果您有与spring数据不相关的

@Component

类，则必须将它们放在更具体的子文件夹中，并引用这些子文件夹。@yoni基于此，我认为您不需要

@Repository

注释。请发布异常的整个堆栈跟踪。我没有Mongo配置的经验。@yoni很抱歉要这么多文档，但这对您来说是春天。您的servlet上下文似乎没有从应用程序上下文继承bean。你能发布你的

web.xml

？或者你如何实例化你的上下文。

ERROR: org.springframework.web.servlet.DispatcherServlet - Context initialization failed
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'userController': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: private com.yes.service.UserService com.yes.controller.UserController.service; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No matching bean of type [com.yes.service.UserService] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:287)

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">

    <!-- The definition of the Root Spring Container shared by all Servlets and Filters -->
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>/WEB-INF/spring/applicationContext.xml</param-value>
    </context-param>

    <!-- Creates the Spring Container shared by all Servlets and Filters -->
    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>

    <!-- Processes application requests -->
    <servlet>
        <servlet-name>appServlet</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>/WEB-INF/spring/appServlet/servlet-context.xml</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>

    <servlet-mapping>
        <servlet-name>appServlet</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>

</web-app>

<context:component-scan base-package="com.yes" />

<context:component-scan base-package="com.yes.service"/>
<context:component-scan base-package="com.yes.controller"/>
<context:component-scan base-package="com.yes.domain"/>
<context:component-scan base-package="com.yes.repository"/>
<context:component-scan base-package="com.yes.dto"/>