依赖注入在Spring MVC中抛出NullPointerException

Question

这里是我的问题：我正在使用SpringMVC，并且在调用@Autowired依赖时遇到了NullPointerException。

这里是@Service：

package x.y.z.service 

@Repository("myService") 
public class MyServiceImpl implements MyService { 
    /* ... */ 
} 

的服务无处不在自动装配应用没有问题，除了这里：

package x.y.z.utils 

@Component 
public class TestClass { 

    @Autowired 
    private MyService myService; 

    public TestClass() { 
    super(); 
    } 

    public void tester() { 
    myService.find(1); 
    } 
} 

，其中方法tester()抛出上myService的NP例外。当跟踪日志时，我看到Spring管理的豆是。

的应用程序上下文文件很简单：

<?xml version="1.0" encoding="UTF-8"?> 
<beans:beans xmlns="http://www.springframework.org/schema/mvc" 
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
    xmlns:beans="http://www.springframework.org/schema/beans" 
    xsi:schemaLocation=" 
     http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd 
     http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd"> 

    <annotation-driven /> 

    <interceptors> 
     <!-- ... --> 
    </interceptors> 

    <resources mapping="/resources/**" location="/resources/" /> 

    <!-- Resolves views selected for rendering by @Controllers to .jsp resources in the /WEB-INF/views directory --> 
    <beans:bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"> 
     <beans:property name="prefix" value="/WEB-INF/views/" /> 
     <beans:property name="suffix" value=".jsp" /> 
    </beans:bean> 

    <!-- Imports user-defined @Controller beans that process client requests --> 
    <beans:import resource="controllers.xml" /> 

    <beans:bean id="validator" class="org.springframework.validation.beanvalidation.LocalValidatorFactoryBean" /> 

</beans:beans> 

和引用controllers.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:mvc="http://www.springframework.org/schema/mvc" 
    xmlns:context="http://www.springframework.org/schema/context" xmlns:tx="http://www.springframework.org/schema/tx" 
    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd 
     http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd 
     http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd 
     http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd"> 

    <!-- Scans within the base package of the application for @Components to 
     configure as beans --> 
    <context:component-scan base-package="x.y.z" /> 
    <context:annotation-config /> 

</beans> 

为期两天的搜索，我不能找到任何帮助后。我错过了什么吗？

THX

Answer 1

请确保您有

<context:component-scan base-package="x.y.z"/> 

另外，请加：

<context:annotation-config/> 

更新：

我很抱歉，但你的XML在模式方面是不正确的，它缺少我所要的LD你增加：

这是你的文件应该如何看起来像：

<?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:context="http://www.springframework.org/schema/context" 
xmlns:aop="http://www.springframework.org/schema/aop" 
xsi:schemaLocation=" 
http://www.springframework.org/schema/beans 
http://www.springframework.org/schema/beans/spring-beans-3.0.xsd 
http://www.springframework.org/schema/context 
http://www.springframework.org/schema/context/spring-context-3.0.xsd 
http://www.springframework.org/schema/aop 
http://www.springframework.org/schema/aop/spring-aop-3.0.xsd"> 
<context:annotation-config /> 
<context:component-scan base-package="x.y.z"></context:component-scan> 
</beans>