由于“切入点中的正式未绑定”，Spring AOP BeanCreationException

Question

我对 Spring AOP 有疑问。

我正在尝试在 Spring MVC 应用程序中实现方面。

我得到的错误是：

Caused by: org.springframework.beans.factory.BeanCreationException:
Error creating bean with name 'org.springframework.cache.annotation.AnnotationCacheOperationSource#0':
Initialization of bean failed; nested exception is
  java.lang.IllegalArgumentException:
  error at ::0 formal unbound in pointcut 

是什么导致了这个问题？

在 XML 文件中我有这个：

<aop:aspectj-autoproxy proxy-target-class="true"/>

我的方面类：

import org.apache.log4j.Logger;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.springframework.stereotype.Component;

@Aspect
@Component
public class ApplicationMonitor {
    private static final Logger logger = Logger.getLogger(ApplicationMonitor.class);

    @Pointcut(value = "execution(* hr.mycompany.controller.impl.MyCompanyController.update(Object))") 
    public void updateMC(Object obj){}

    @Before(value="ApplicationMonitor.updateMC(Object)")
    public void beforeUpdateMC(JoinPoint jp) {
        Object obj = jp.getArgs()[0];
        logger.info("beforeUpdateMC " + obj);
    }
}

在 pom.xml 文件中我有这个依赖项：

    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-aop</artifactId>
        <version>4.1.5.RELEASE</version>
    </dependency>
    <dependency>
        <groupId>org.aspectj</groupId>
        <artifactId>aspectjtools</artifactId>
        <version>1.8.10</version>
    </dependency>
    <dependency>
        <groupId>org.aspectj</groupId>
        <artifactId>aspectjrt</artifactId>
        <version>1.8.10</version>
    </dependency>
    <dependency>
        <groupId>org.aspectj</groupId>
        <artifactId>aspectjweaver</artifactId>
        <version>1.8.10</version>
    </dependency>
    <dependency>
        <groupId>cglib</groupId>
        <artifactId>cglib</artifactId>
        <version>2.2</version>
    </dependency>

编辑（更改切入点后）：

我更改了切入点，现在我收到如下错误：

Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [hr.mycompany.dao.IGenericHibernateDao] 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)}


09:11:27,871 ERROR [org.apache.catalina.core.ContainerBase.[jboss.web].[default-host].[/BasicData-portlet]] (http--0.0.0.0-8083-2) StandardWrapper.Throwable: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'MyCompanyService': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: private hr.mycompany.dao.IGenericHibernateDao hr.mycompany.services.impl.MyCompanyService.vwObjectDao; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [hr.mycompany.dao.IGenericHibernateDao] 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)}

我的应用有多个层和类，如下所示：

@Controller 
public class MyCompanyController implements IMyCompanyController{

    @Autowired
    private IMyComapnyService myCompanyService;

}


@Service
public class MyCompanyService implements IMyComapnyService {

    @Autowired
    private IGenericHibernateDao<Object, Integer>  vwObjectDao;

}

我正在尝试为@Controller 和@Service @Autowired 方法提供建议。

Answer 1

用户 heonlyrao 提出了正确的建议，但切入点语法错误。你想这样做：

    @Pointcut("execution(* hr.mycompany.controller.impl.MyCompanyController.update(*)) && args(obj)") 
    public void updateMC(Object obj) {}

    @Before("updateMC(obj)")
    public void beforeUpdateMC(JoinPoint jp, Object obj) {
        // Not needed if parameter is bound via args()
        // Object obj = jp.getArgs()[0];
        logger.info("beforeUpdateMC " + obj);
    }

或者，类似于 heonlyrao 的建议，如果您不在多个建议中重复使用相同的切入点，您也可以内联它：

    @Before("execution(* hr.mycompany.controller.impl.MyCompanyController.update(*)) && args(obj)")
    public void beforeUpdateMC(JoinPoint jp, Object obj) {
        // Not needed if parameter is bound via args()
        // Object obj = jp.getArgs()[0];
        logger.info("beforeUpdateMC " + obj);
    }

解释：您的错误消息显示：formal unbound in pointcut。这意味着您要么在切入点中使用形式参数和/或在切入点中未反映的建议方法签名，反之亦然。