意外輸出，而寫一彈簧AOP程序

意外輸出而運行一個簡單Aop的應用。

任務我做：

1）我創建了一個Camera類和Logger類。該Camera類有一個snap()方法和Logger類有一個takePhoto()方法。

public class Camera { 
    public void snap(){ 
    System.out.println("SNAP"); 
    } 
} 

public class Logger { 
    public void takePhoto(){ 
    System.out.println(" About to take photo ... "); 
    } 
}

2）我在我的beans.xml文件中配置了切入點，方面和建議。

<?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:aop="http://www.springframework.org/schema/aop" 
xsi:schemaLocation="http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.1.xsd 
    http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd"> 


<bean id="camera" class="com.jalaj.spring.aop.Camera"></bean> 
<bean id="logger" class="com.jalaj.spring.aop.Logger"></bean> 
<aop:config> 
    <aop:pointcut 
     expression="execution(void com.jalaj.spring.aop.Camera.snap())" 
     id="camerasnap" /> 
    <aop:aspect id="logger" ref="loggeraspect"> 
     <aop:before method="takePhoto" pointcut-ref="camerasnap" /> 
    </aop:aspect> 
</aop:config> 
</beans>

3）測試應用程序加載配置文件

public static void main(String[] args) { 
    ApplicationContext context = new ClassPathXmlApplicationContext("/com/jalaj/spring/aop/beans.xml"); 
    Camera p=(Camera)context.getBean("camera"); 
    p.snap(); 
    ((AbstractApplicationContext) context).close(); 

}

4）我已經包含在我的pom.xml文件

<dependencies> 
    <dependency> 
    <groupId>org.springframework</groupId> 
    <artifactId>spring-core</artifactId> 
    <version>4.1.6.RELEASE</version> 
    </dependency> 
    <dependency> 
    <groupId>junit</groupId> 
    <artifactId>junit</artifactId> 
    <version>3.8.1</version> 
    <scope>test</scope> 
    </dependency> 
    <dependency> 
    <groupId>org.springframework</groupId> 
    <artifactId>spring-beans</artifactId> 
    <version>4.1.6.RELEASE</version> 
    </dependency> 
    <dependency> 
    <groupId>org.springframework</groupId> 
    <artifactId>spring-context</artifactId> 
    <version>4.1.6.RELEASE</version> 
    </dependency> 
    <dependency> 
    <groupId>org.springframework</groupId> 
    <artifactId>spring-aspects</artifactId> 
    <version>3.2.4.RELEASE</version> 
    </dependency> 

    <dependency> 
    <groupId>org.aspectj</groupId> 
    <artifactId>aspectjrt</artifactId> 
    <version>1.7.3</version>  
    </dependency> 
    <dependency> 
    <groupId>org.aspectj</groupId> 
    <artifactId>aspectjweaver</artifactId> 
    <version>1.7.3</version> 
    </dependency> 
    <dependency> 
    <groupId>aspectj</groupId> 
    <artifactId>aspectjweaver</artifactId> 
    <version>1.5.4</version> 
    </dependency> 
    <dependency> 
    <groupId>cglib</groupId> 
    <artifactId>cglib</artifactId> 
    <version>2.2</version> 
    </dependency> 
    <dependency> 
    <groupId>org.springframework</groupId> 
    <artifactId>spring-aop</artifactId> 
    <version>4.2.4.RELEASE</version> 
    </dependency> 
</dependencies>

而且給定的罐子，我已經看到了一些以前的問題，但我無法找出適當的解決方案。

任何人都可以指導我如何正確解決這個問題？

總產值有望

About to take photo ... 
SNAP

輸出中

Exception encountered during context initialization - cancelling refresh attempt 
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'camera' defined in class path resource [com/jalaj/spring/aop/beans.xml]: BeanPostProcessor before instantiation of bean failed; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'org.springframework.aop.aspectj.AspectJPointcutAdvisor#0': Cannot create inner bean '(inner bean)#5852765b' of type [org.springframework.aop.aspectj.AspectJMethodBeforeAdvice] while setting constructor argument; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name '(inner bean)#5852765b': Cannot create inner bean '(inner bean)#43350d11' of type [org.springframework.aop.config.MethodLocatingFactoryBean] while setting constructor argument; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name '(inner bean)#43350d11': Initialization of bean failed; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No bean named 'loggeraspect' is defined 
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:472) 
at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:303) 
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230) 
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:299) 
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:194) 
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:755) 
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:757) 
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:480) 
at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:139) 
at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:83) 
at com.jalaj.spring.aop.AppTest.main(AppTest.java:9) 
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'org.springframework.aop.aspectj.AspectJPointcutAdvisor#0': Cannot create inner bean '(inner bean)#5852765b' of type [org.springframework.aop.aspectj.AspectJMethodBeforeAdvice] while setting constructor argument; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name '(inner bean)#5852765b': Cannot create inner bean '(inner bean)#43350d11' of type [org.springframework.aop.config.MethodLocatingFactoryBean] while setting constructor argument; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name '(inner bean)#43350d11': Initialization of bean failed; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No bean named 'loggeraspect' is defined 
at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveInnerBean(BeanDefinitionValueResolver.java:313) 
at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveValueIfNecessary(BeanDefinitionValueResolver.java:129) 
at org.springframework.beans.factory.support.ConstructorResolver.resolveConstructorArguments(ConstructorResolver.java:648) 
at org.springframework.beans.factory.support.ConstructorResolver.autowireConstructor(ConstructorResolver.java:140) 
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.autowireConstructor(AbstractAutowireCapableBeanFactory.java:1139) 
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1042) 
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:504) 
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:476) 
at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:303) 
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230) 
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:299) 
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199) 
at org.springframework.aop.framework.autoproxy.BeanFactoryAdvisorRetrievalHelper.findAdvisorBeans(BeanFactoryAdvisorRetrievalHelper.java:92) 
at org.springframework.aop.framework.autoproxy.AbstractAdvisorAutoProxyCreator.findCandidateAdvisors(AbstractAdvisorAutoProxyCreator.java:101) 
at org.springframework.aop.aspectj.autoproxy.AspectJAwareAdvisorAutoProxyCreator.shouldSkip(AspectJAwareAdvisorAutoProxyCreator.java:103) 
at org.springframework.aop.framework.autoproxy.AbstractAutoProxyCreator.postProcessBeforeInstantiation(AbstractAutoProxyCreator.java:248) 
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyBeanPostProcessorsBeforeInstantiation(AbstractAutowireCapableBeanFactory.java:984) 
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.resolveBeforeInstantiation(AbstractAutowireCapableBeanFactory.java:955) 
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:466) 
... 10 more

來源

2017-09-25 Jalaj Chawla

它在日誌......找不到loggeraspect作爲一個bean，你沒有這個名字這樣一個bean。 – Fernando

停止混合框架版本。您正在混合使用Spring 3.2,4.1和4.2以及AspectJ 1.5和1.7。最後你的'ref'應該指向'logger'，因爲這是你方面的id。 –

@ M.Deinum謝謝 –

ref指bean的id，似乎你想要的是：

<aop:aspect id="loggeraspect" ref="logger">

，而不是

<aop:aspect id="logger" ref="loggeraspect">

來源

2017-09-25 13:31:20 Berger

意外輸出，而寫一彈簧AOP程序

回答

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