春天web應用程序 - autowire - 找不到bean注入

Question

我有一個彈簧控制器與自動裝配的對象，春天說，儘管我看到 - 儘管我看到 - 在日誌文件中找不到 - 爲它創建的bean /對象在根應用程序上下文中。它在部署應用程序期間發生（在Tomcat中）。

我試圖將@Qualifier添加到@Autowired字段，但它沒有解決問題。

控制器：

package com.maha.testspring.endpoints.webrest.controllers; 
import com.maha.testspring.services.TestSpringService; 

@Controller 
@RequestMapping("/testspring") 
public class TestSpringController 
{ 
    @Autowired 
    @Qualifier("testSpringService") 
    private TestSpringService testSpringService; 
    ... 
} 

戰爭testspring的端點，webrest-1.0-SNAPSHOT/WEB-INF/web.xml中

<?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"> 

    <context-param> 
     <param-name>contextConfigLocation</param-name> 
     <param-value>/WEB-INF/spring/root-context.xml</param-value> 
    </context-param> 

    <listener> 
     <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class> 
    </listener> 

    <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/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> 

戰爭testspring的端點，webrest-1.0 -SNAPSHOT/WEB-INF/spring/servlet-context.xml：

<?xml version="1.0" encoding="UTF-8"?> 
<beans:beans 
     ... 
     <mvc:annotation-driven /> 
     <context:annotation-config /> 
     <context:spring-configured /> 
     <context:component-scan base-package="com.maha.testspring.endpoints.webrest.controllers" /> 

</beans:beans> 

戰爭testspring的端點，webrest-1.0-SNAPSHOT/WEB-INF /春/根的context.xml：

<?xml version="1.0" encoding="UTF-8"?> 
<beans ... 
    <bean class="org.springframework.context.support.ClassPathXmlApplicationContext"> 
     <constructor-arg> 
      <list> 
       <value>/applicationContext.testspring.services.xml</value> 
      </list> 
     </constructor-arg> 
    </bean> 
</beans> 

服務實現類：（罐中，testspring - 服務 - IMPL-1.0-SNAPSHOT.jar - 在戰爭的testspring的端點，webrest-1.0-SNAPSHOT \ WEB-INF \ lib文件夾）

package com.maha.testspring.services; 
import org.springframework.stereotype.Service; 

@Service("testSpringService") 
public class TestSpringServiceImpl implements TestSpringService { 
    public void testIt() { System.out.println("..."); } 
} 

服務接口：（罐中，testspring服務S-接口-1.0-SNAPSHOT.jar - 在戰爭的testspring的端點，webrest-1.0-SNAPSHOT \ WEB-INF \ lib文件夾）

package com.maha.testspring.services; 
public interface TestSpringService 
{ 
    public void testIt(); 
} 

applicationContext.testspring.services.xml（在罐子， testspring服務，實現了一套-1.0-SNAPSHOT.jar - 在戰爭的testspring的端點，webrest-1.0-SNAPSHOT \ WEB-INF \ lib文件夾）

<?xml version="1.0" encoding="UTF-8"?> 
<beans ...> 
    <context:spring-configured/> 
    <context:annotation-config /> 
    <context:component-scan base-package="com.maha.testspring.services"/> 
</beans> 

記錄 - 顯示TestSpringServiceImpl是爲@Service處理（作爲稍後注入依賴關係時的候選組件）

annotation.ClassPathBeanDefinitionScanner  - Identified candidate component class: URL [jar:file:/C:/osd/Tomcat%208.0/webapps/testspringwebrest/WEB-INF/lib/testspring-services-impl-1.0-SNAPSHOT.jar!/com/maha/testspring/services/TestSpringServiceImpl.class] 
support.ClassPathXmlApplicationContext  - Bean factory for org.springframework.context.support.ClassPathXmlApplicationContext@41e89deb: org.springframework.beans.factory.support.DefaultListableBeanFactory@7487b2bc 

記錄顯示創建bean實例的該類：當試圖創建控制器

support.DefaultListableBeanFactory  - Creating shared instance of singleton bean 'testSpringService' 
support.DefaultListableBeanFactory  - Creating instance of bean 'testSpringService' 
support.DefaultListableBeanFactory  - Eagerly caching bean 'testSpringService' to allow for resolving potential circular references 
support.DefaultListableBeanFactory  - Finished creating instance of bean 'testSpringService' 

錯誤 - 找不到豆注入：

support.DefaultListableBeanFactory  - Creating shared instance of singleton bean 'testSpringController' 
support.DefaultListableBeanFactory  - Creating instance of bean 'testSpringController' 
annotation.InjectionMetadata  - Registered injected element on 
class [com.maha.testspring.endpoints.webrest.controllers.TestSpringController]:  AutowiredFieldElement for 
private com.maha.testspring.services.TestSpringService com.maha.testspring.endpoints.webrest.controllers.TestSpringController.testSpringService 
annotation.InjectionMetadata  - Processing injected element of bean 'testSpringController': 
AutowiredFieldElement for private 
com.maha.testspring.services.TestSpringService 
com.maha.testspring.endpoints.webrest.controllers.TestSpringController.testSpringService 

support.XmlWebApplicationContext  - Exception encountered during context initialization - cancelling refresh attempt 
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'testSpringController': 
Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: 
Could not autowire field: private com.maha.testspring.services.TestSpringService com.maha.testspring.endpoints.webrest.controllers.TestSpringController.testSpringService; 
nested exception is 
org.springframework.beans.factory.NoSuchBeanDefinitionException: 
No qualifying bean of type 
[com.maha.testspring.services.TestSpringService] found for dependency: 
expected at least 1 bean which qualifies as autowire candidate for this dependency. 

Answer 1

我有類似的問題。我們通過保持CASE相同來解決它。在您的例子中，你使用@Qualifier("testSpringService") 和你YOUT服務0​​

嘗試在testSpringService一個小T轉變爲public class TestSpringServiceImpl implements testSpringService。

如果不要解決您的問題，然後嘗試註釋的父類（請記住，註釋不從父類繼承來的孩子，你的情況，你有註釋的孩子，而不是它的父），如：

package com.maha.testspring.services; 
@Service("testSpringService") 
public interface TestSpringService 
{ 
    public void testIt(); 
}