Spring中的“无法自动装配字段”异常

Question

我有一个Spring应用程序，我使用的是Spring 3.0.4版。 当我启动服务器时，它显示错误：

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'customController': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: org.domain.Custom org.controller.CustomController.custom; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No matching bean of type [org.domain.Custom] 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)}
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:288)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1095)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:516)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:455)
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:294)
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:225)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:291)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:193)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:585)
    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:913)
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:464)
    at org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext(ContextLoader.java:381)
    at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:283)
    at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:111)

域类的代码

@Entity
@Configurable
@Table(name="tbltest")
public class Custom implements Serializable{

    @Autowired
    public transient CustomRepository customRepository;

    public static CustomRepository getRepository() {
        CustomRepository repository = new Custom().CustomRepository;
        return repository;
    }

    @Transactional(readOnly = true)
    public static Custom find(final Long id) {
        return getRepository().find(id);
    }
}

应用程序上下文中包含的配置

<context:load-time-weaver/>
<context:spring-configured />
<context:annotation-config />
<context:component-scan base-package="org.domain.custom"/>

我的测试类的代码：

@Test
@Transactional
public void testCreateNew() {
    Custom registration = new Custom("ttt");
    Custom.find(1l);
    registration.persist();
    Assert.assertEquals(true, registration.getId() > 0);
}

控制器

@Controller
@RequestMapping("/custom")
public class CustomController
{
    @Autowired
    public Custom Custom;
}

我已为VM参数添加了spring-instrument.jar。

Answer 1

好像你忘了添加

<context:component-scan base-package="org.domain" />

到您的application-context.xml，以便spring知道在哪里扫描您的@Component注释。仅启用<context:annotation-config />是不够的。