RestController 需要一个带有 spring boot 和多模块的服务 bean答案

【问题标题】：RestController required a service bean with spring boot & multi modulesRestController 需要一个带有 spring boot 和多模块的服务 bean
【发布时间】：2017-04-10 05:17:16
【问题描述】：

我将我的 Spring Boot 项目作为单个 Maven 项目进行了测试，并且一切正常。我决定将我的应用程序拆分为子模块。存储库、服务和 Spring Boot Web 模块。自动接线停止工作。并出现以下错误：

20:12:08.052 [main] WARN  o.s.b.c.e.AnnotationConfigEmbeddedWebApplicationContext - Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'userRestController': Unsatisfied dependency expressed through field 'userService'; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'org.plendo.service.interfaces.UserService' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
20:12:08.068 [main] WARN  o.s.boot.SpringApplication - Error handling failed (Error creating bean with name 'delegatingApplicationListener' defined in class path resource [org/springframework/security/config/annotation/web/configuration/WebSecurityConfiguration.class]: BeanPostProcessor before instantiation of bean failed; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'org.springframework.transaction.annotation.ProxyTransactionManagementConfiguration': Initialization of bean failed; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No bean named 'org.springframework.context.annotation.ConfigurationClassPostProcessor.importRegistry' available)
20:12:08.243 [main] ERROR o.s.b.d.LoggingFailureAnalysisReporter - ``
***************************
APPLICATION FAILED TO START
***************************
Description:
Field userService in org.plendo.ui.controller.UserRestController required a bean of type 'org.plendo.service.interfaces.UserService' that could not be found.

【问题讨论】：

信息不够。你有没有例如改变你的包结构？你的项目结构和配置类现在是什么样子的？

标签： spring rest maven spring-mvc spring-boot

【解决方案1】：

项目结构：父项目包含jpa模块、服务模块和web模块（spring boot app）

spring boot 应用类：web 模块

package org.plendo.ui;     
@SpringBootApplication public class App { public static void main(String[] args) { 
@SpringBootApplication
public class App {
public static void main(String[] args) {
    SpringApplication.run(App.class, args);
}
    }

RestController 类：网络模块

package org.plendo.ui.controller;
import org.plendo.jpa.entity.User;

import org.plendo.service.interfaces.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
//@ComponentScan("org.plendo.service.interfaces")
public class UserRestController {

@Autowired
//@Qualifier("userService")
private UserService userService;

@RequestMapping(value = "/saveUser")
public User saveUser(User u) {
    return userService.saveUser(u);
}
}

UserServiceImpl : 服务模块

import org.apache.log4j.Logger;
import org.plendo.jpa.entity.User;
import org.plendo.jpa.entity.UserRepository;
import org.plendo.service.interfaces.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.stereotype.Service;

@Service
public class UserServiceImpl implements UserService {

private Logger logger = Logger.getLogger(this.getClass());
@Autowired
UserRepository userRepository;

@Override
public User saveUser(User u) {
    return userRepository.save(u);
}

}

UserService接口：服务模块

package org.plendo.service.interfaces;

import org.plendo.jpa.entity.User;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.stereotype.Service;

public interface UserService {

public User saveUser(User u);
}

UserRepository 接口：jpa 模块

package org.plendo.jpa.entity;

import org.springframework.data.jpa.repository.JpaRepository;

public interface UserRepository  extends JpaRepository<User, String>{

}

还有其他事情要做吗？

【讨论】：