AOP不工作

Question

我使用春季启动1.4.1在gradle这个文件下列首发：

compile('org.springframework.boot:spring-boot-starter-web')    
compile('org.springframework.boot:spring-boot-starter-validation')  
compile('org.springframework.boot:spring-boot-starter-data-jpa')  
compile('org.springframework.boot:spring-boot-starter-aop') 

我试图使用Spring AOP实现的日志记录。如果我运行没有上述看点一切工作正常应用

java.lang.IllegalStateException: Failed to load ApplicationContext 
    Caused by: org.springframework.beans.factory.BeanCreationException: 
Error creating bean with name 'embeddedServletContainerCustomizerBeanPostProcessor': BeanPostProcessor before instantiation of bean failed; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'org.springframework.transaction.annotation.ProxyTransactionManagementConfiguration': Initialization of bean failed; nested exception is java.lang.IllegalStateException: Must set property 'expression' before attempting to match 
      at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:478) ~[spring-beans-4.3.3.RELEASE.jar:4.3.3.RELEASE] 
      at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306) ~[spring-beans-4.3.3.RELEASE.jar:4.3.3.RELEASE] 
      at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230) ~[spring-beans-4.3.3.RELEASE.jar:4.3.3.RELEASE] 
      at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302) ~[spring-beans-4.3.3.RELEASE.jar:4.3.3.RELEASE] 
      at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202) ~[spring-beans-4.3.3.RELEASE.jar:4.3.3.RELEASE] 
      at org.springframework.context.support.PostProcessorRegistrationDelegate.registerBeanPostProcessors(PostProcessorRegistrationDelegate.java:240) ~[spring-context-4.3.3.RELEASE.jar:4.3.3.RELEASE] 
      at org.springframework.context.support.AbstractApplicationContext.registerBeanPostProcessors(AbstractApplicationContext.java:697) ~[spring-context-4.3.3.RELEASE.jar:4.3.3.RELEASE] 
      at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:526) ~[spring-context-4.3.3.RELEASE.jar:4.3.3.RELEASE] 
      at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:761) ~[spring-boot-1.4.1.RELEASE.jar:1.4.1.RELEASE] 
      at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:371) ~[spring-boot-1.4.1.RELEASE.jar:1.4.1.RELEASE] 
      at org.springframework.boot.SpringApplication.run(SpringApplication.java:315) ~[spring-boot-1.4.1.RELEASE.jar:1.4.1.RELEASE] 
      at org.springframework.boot.test.context.SpringBootContextLoader.loadContext(SpringBootContextLoader.java:111) ~[spring-boot-test-1.4.1.RELEASE.jar:1.4.1.RELEASE] 
      at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContextInternal(DefaultCacheAwareContextLoaderDelegate.java:98) ~[spring-test-4.3.3.RELEASE.jar:4.3.3.RELEASE] 
      at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContext(DefaultCacheAwareContextLoaderDelegate.java:116) ~[spring-test-4.3.3.RELEASE.jar:4.3.3.RELEASE] 
      ... 25 common frames omitted 
     Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'org.springframework.transaction.annotation.ProxyTransactionManagementConfiguration': Initialization of bean failed; nested exception is java.lang.IllegalStateException: Must set property 'expression' before attempting to match 
      at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:553) ~[spring-beans-4.3.3.RELEASE.jar:4.3.3.RELEASE] 
      at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:482) ~[spring-beans-4.3.3.RELEASE.jar:4.3.3.RELEASE] 
      at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306) ~[spring-beans-4.3.3.RELEASE.jar:4.3.3.RELEASE] 
      at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230) ~[spring-beans-4.3.3.RELEASE.jar:4.3.3.RELEASE] 
      at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302) ~[spring-beans-4.3.3.RELEASE.jar:4.3.3.RELEASE] 
      at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197) ~[spring-beans-4.3.3.RELEASE.jar:4.3.3.RELEASE] 
      at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:372) ~[spring-beans-4.3.3.RELEASE.jar:4.3.3.RELEASE] 
      at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1128) ~[spring-beans-4.3.3.RELEASE.jar:4.3.3.RELEASE] 
      at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1023) ~[spring-beans-4.3.3.RELEASE.jar:4.3.3.RELEASE] 
      at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:510) ~[spring-beans-4.3.3.RELEASE.jar:4.3.3.RELEASE] 
      at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:482) ~[spring-beans-4.3.3.RELEASE.jar:4.3.3.RELEASE] 
      at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306) ~[spring-beans-4.3.3.RELEASE.jar:4.3.3.RELEASE] 
      at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230) ~[spring-beans-4.3.3.RELEASE.jar:4.3.3.RELEASE] 
      at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302) ~[spring-beans-4.3.3.RELEASE.jar:4.3.3.RELEASE] 
      at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202) ~[spring-beans-4.3.3.RELEASE.jar:4.3.3.RELEASE] 
      at org.springframework.aop.framework.autoproxy.BeanFactoryAdvisorRetrievalHelper.findAdvisorBeans(BeanFactoryAdvisorRetrievalHelper.java:92) ~[spring-aop-4.3.3.RELEASE.jar:4.3.3.RELEASE] 
      at org.springframework.aop.framework.autoproxy.AbstractAdvisorAutoProxyCreator.findCandidateAdvisors(AbstractAdvisorAutoProxyCreator.java:101) ~[spring-aop-4.3.3.RELEASE.jar:4.3.3.RELEASE] 
      at org.springframework.aop.aspectj.annotation.AnnotationAwareAspectJAutoProxyCreator.findCandidateAdvisors(AnnotationAwareAspectJAutoProxyCreator.java:85) ~[spring-aop-4.3.3.RELEASE.jar:4.3.3.RELEASE] 
      at org.springframework.aop.aspectj.autoproxy.AspectJAwareAdvisorAutoProxyCreator.shouldSkip(AspectJAwareAdvisorAutoProxyCreator.java:103) ~[spring-aop-4.3.3.RELEASE.jar:4.3.3.RELEASE] 
      at org.springframework.aop.framework.autoproxy.AbstractAutoProxyCreator.postProcessBeforeInstantiation(AbstractAutoProxyCreator.java:249) ~[spring-aop-4.3.3.RELEASE.jar:4.3.3.RELEASE] 
      at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyBeanPostProcessorsBeforeInstantiation(AbstractAutowireCapableBeanFactory.java:993) ~[spring-beans-4.3.3.RELEASE.jar:4.3.3.RELEASE] 
      at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.resolveBeforeInstantiation(AbstractAutowireCapableBeanFactory.java:964) ~[spring-beans-4.3.3.RELEASE.jar:4.3.3.RELEASE] 
      at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:472) ~[spring-beans-4.3.3.RELEASE.jar:4.3.3.RELEASE] 
      ... 38 common frames omitted 
     Caused by: java.lang.IllegalStateException: Must set property 'expression' before attempting to match 
      at org.springframework.aop.aspectj.AspectJExpressionPointcut.checkReadyToMatch(AspectJExpressionPointcut.java:187) ~[spring-aop-4.3.3.RELEASE.jar:4.3.3.RELEASE] 
      at org.springframework.aop.aspectj.AspectJExpressionPointcut.getClassFilter(AspectJExpressionPointcut.java:170) ~[spring-aop-4.3.3.RELEASE.jar:4.3.3.RELEASE] 
      at org.springframework.aop.support.AopUtils.canApply(AopUtils.java:220) ~[spring-aop-4.3.3.RELEASE.jar:4.3.3.RELEASE] 
      at org.springframework.aop.support.AopUtils.canApply(AopUtils.java:279) ~[spring-aop-4.3.3.RELEASE.jar:4.3.3.RELEASE] 
      at org.springframework.aop.support.AopUtils.findAdvisorsThatCanApply(AopUtils.java:311) ~[spring-aop-4.3.3.RELEASE.jar:4.3.3.RELEASE] 
      at org.springframework.aop.framework.autoproxy.AbstractAdvisorAutoProxyCreator.findAdvisorsThatCanApply(AbstractAdvisorAutoProxyCreator.java:118) ~[spring-aop-4.3.3.RELEASE.jar:4.3.3.RELEASE] 
      at org.springframework.aop.framework.autoproxy.AbstractAdvisorAutoProxyCreator.findEligibleAdvisors(AbstractAdvisorAutoProxyCreator.java:88) ~[spring-aop-4.3.3.RELEASE.jar:4.3.3.RELEASE] 
      at org.springframework.aop.framework.autoproxy.AbstractAdvisorAutoProxyCreator.getAdvicesAndAdvisorsForBean(AbstractAdvisorAutoProxyCreator.java:69) ~[spring-aop-4.3.3.RELEASE.jar:4.3.3.RELEASE] 
      at org.springframework.aop.framework.autoproxy.AbstractAutoProxyCreator.wrapIfNecessary(AbstractAutoProxyCreator.java:347) ~[spring-aop-4.3.3.RELEASE.jar:4.3.3.RELEASE] 
      at org.springframework.aop.framework.autoproxy.AbstractAutoProxyCreator.postProcessAfterInitialization(AbstractAutoProxyCreator.java:299) ~[spring-aop-4.3.3.RELEASE.jar:4.3.3.RELEASE] 
      at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyBeanPostProcessorsAfterInitialization(AbstractAutowireCapableBeanFactory.java:422) ~[spring-beans-4.3.3.RELEASE.jar:4.3.3.RELEASE] 
      at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1588) ~[spring-beans-4.3.3.RELEASE.jar:4.3.3.RELEASE] 
      at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:545) ~[spring-beans-4.3.3.RELEASE.jar:4.3.3.RELEASE] 
      ... 60 common frames omitted 

：

@Aspect                
@Component               
public class ServiceLogAspect {          
    @Before("execution(* method(..)")         
    logentry(JoinPoint j) {            
    logger.log("Method Entry");           
    }                 
}                 

当我运行应用程序，我得到下面的异常。

请帮忙。

Answer 1

您应该得到一个错误为您的代码。

下面是一个非常简单的例子，可以将它添加到弹簧引导的AOP功能中。

package com.example; 
// ...... importer 
@SpringBootApplication 
public class SpringBootAopApplication { 

    public static void main(String[] args) { 
     SpringApplication.run(SpringBootAopApplication.class, args); 
    } 
} 

@Aspect 
@Component 
class ServiceLogAspect { 
    @Before("execution(* com.example.*.*(..))")       
    public void log(JoinPoint j) { 
     System.out.println("Welcome......" + j.getStaticPart()); 
    } 
} 

@RestController 
class WelcomeController { 
    @RequestMapping(path = "/welcome") 
    public String welcome() { 
     return "Welcome"; 
    } 
} 

当你visis的GET - http://localhost:8080/welcome

您将看到控制台消息

Welcome......execution(String com.example.WelcomeController.welcome())