Question

我遇到过问题。我已经研究了很多相同的主题，但我无法解决问题。我有SpringBoot应用程序。我想开发RestController类。它看起来如何：

@RequestMapping("achievement/")
@RestController
public class AchievementController {

@Autowired
private AchievementManager manager;

@RequestMapping(value = "{id}", method = RequestMethod.GET)
public Achievement showAchievement(@PathVariable("id") Long id) throws DBException {
    return manager.getAchievementById(id);
}

@RequestMapping(value = "/", consumes = "application/json", method = RequestMethod.POST)
public Achievement createAchievement(@RequestBody Achievement achievement) throws DBException {
    return manager.createAchievementAndReturn(achievement);
}

@RequestMapping(value = "{id}", consumes = "application/json", method = RequestMethod.PUT)
public Achievement changeAchievement(@PathVariable("id") Long id, @RequestBody Achievement achievement) throws DBException {
    return manager.saveChangesAndReturn(id, achievement);
}
}

我在@Autowire经理领域遇到了麻烦

Exception encountered during context initialization - cancelling
refresh attempt:org.springframework.beans.factory.
BeanCreationException: 
Error creating bean with name 'achievementController': Injection of 
autowired dependencies failed; nested exception is 
org.springframework.beans.factory.BeanCreationException: 
Could not autowire field: private  
com.rpglife.data.managers.AchievementManager  
com.rpglife.controller.AchievementController.manager; nested exception   
is org.springframework.beans.factory.NoSuchBeanDefinitionException: No 
qualifying bean of type [com.rpglife.data.managers.AchievementManager] 
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)}
.
.
.
Caused by: org.springframework.beans.factory.
NoSuchBeanDefinitionException: No qualifying bean of type  
[com.rpglife.data.managers.AchievementManager] 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)}

我的AchievmentManager课程：

@SuppressWarnings("unchecked")
public class AchievementManager {

private final Class thisClass = Achievement.class;
private BaseDAO dao;

public AchievementManager(BaseDAO dao) {
    this.dao = dao;
}

public Achievement getAchievementById(Long id) {
    return (Achievement) dao.getItem(thisClass, id);
}

public Achievement createAchievementAndReturn(Achievement achievement) {
    dao.createItem(achievement);
    return getAchievementById(achievement.getId());
}

public Achievement saveChangesAndReturn(Long id, Achievement achievement) {
    return dao.updateItem(thisClass, id, achievement);
}
}

Spring xml在这里：

<?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:context="http://www.springframework.org/schema/context"
   xsi:schemaLocation="
   http://www.springframework.org/schema/beans       
   http://www.springframework.org/schema/beans/spring-beans-3.0.xsd">

<bean name="manager" class="com.rpglife.data.managers.AchievementManager" >
    <constructor-arg name="dao" ref="dao"/>
</bean>

<bean name="dao" class="com.rpglife.data.BaseDAO" >
    <constructor-arg name="sessionFactory" ref="sessionFactory"/>
</bean>

<bean id="sessionFactory"
      class="org.springframework.orm.hibernate4.LocalSessionFactoryBean">
    <property name="configLocation" value="hibernate.cfg.xml"/>
</bean>

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

</beans>

主要课程：

@SpringBootApplication
public class Main {
    public static void main(String[] args) {
        SpringApplication.run(Main.class, args);
    }
}

这里是我的项目结构（如果需要，我也可以附加资源）： enter image description here

我试图弄清楚：

我尝试过使用@Qualyfier（＆＃34;经理＆＃34;）
尝试使用@ComponentScan（basePackages = {＆＃34; com.rpglife＆＃34;}）和 @SpringBootApplication（scanBasePackages = {＆＃34; com.rpglife＆＃34;}）（但主要上课留在com.rpglife。其他包也在这里，我确定这没用了）

我不知道出了什么问题...... 如果你给我一些答案和建议，我将非常感激。希望你度过愉快的一天！）

更新：我认为我的spring.xml可能有问题。如果它不起作用并且bean无法定义怎么办？如何检查...

更新：添加@

Exception encountered during context initialization - cancelling 
refresh attempt: 
org.springframework.beans.factory.BeanCreationException: Error creating 
bean with name 'achievementController': Injection of autowired 
dependencies failed; nested exception is 
org.springframework.beans.factory.BeanCreationException: Could not 
autowire field: private com.rpglife.data.managers.AchievementManager 
com.rpglife.controller.AchievementController.manager; nested exception 
is org.springframework.beans.factory.BeanCreationException: Error 
creating bean with name 'achievementManager' defined in file 
[/Users/eignatik/IdeaProjects/LifeRPG/be/target
/classes/com/rpglife/data/managers/AchievementManager.class]: 
Instantiation of bean failed; nested exception is 
org.springframework.beans.BeanInstantiationException: Failed to 
instantiate [com.rpglife.data.managers.AchievementManager]: No default 
constructor found; nested exception is java.lang.NoSuchMethodException: 
com.rpglife.data.managers.AchievementManager.<init>()

Answer 1

您正在混合使用Spring Boot和基于XML的应用程序上下文。

默认情况下，Spring Boot不会加载应用程序上下文xml文件。（Spring boot大力推广基于非xml的上下文）

您有两个选择：

不要使用XML，并为所有类注释。嵌套在@SpringBootApplication包中的所有Spring注释类都将被扫描。这就是应该如何使用Spring Boot。
如果您确实要继续使用xml http://docs.spring.io/spring-boot/docs/current-SNAPSHOT/reference/htmlsingle/#using-boot-importing-xml-configuration

无法在@RestController中自动装配字段

1 个答案: