java - 在 jar 文件中注入(inject) Autowiring 的依赖项失败

Question

我在我的 war 文件的 lib 文件夹下放了一个 jar 文件。在 jar 里，我有一些带有@Autowired 文件的类。在 jar 中，在我给出的 applicationContext xml 中

<context:component-scan base-package="com.main.java.mypath" />

代码:

package com.main.java.mypath.client;

@Component
public class ServiceProvider {

   @Autowired
   private StoreField storeField;




package com.main.java.mypath.data;
public interface StoreField {
}

错误:

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'serviceProvider': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: private com.main.java.mypath.data.StoreField com.main.java.mypath.client.ServiceProvider.storeField; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [com.main.java.mypath.data.StoreField] 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)}

Answer 1

只要您没有StoreField 接口(interface)的实现，就不可能注入(inject)依赖项。确保它作为类实现并通过 xml 或注释在 spring 上下文中正确初始化。