Java 春季aop:can'；找不到引用的切入点批注

我试图监视某些方法的运行。我在运行程序时遇到了这个错误

Exception in thread "main" org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'arithmeticCalculator' defined in URL [jar:file:/home/android/java/spring-5-recipes-master/spring-recipes-UPDATED-master/ch02/recipe_2_17_i/build/libs/recipe_2_17_i-4.0.0-SNAPSHOT.jar!/com/apress/springrecipes/calculator/ArithmeticCalculatorImpl.class]: Initialization of bean failed; nested exception is java.lang.IllegalArgumentException: error at ::0 can't find referenced pointcut annotation
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:591)
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:502)
        at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:312)
        at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:228)
        at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:310)
        at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:200)
        at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:760)
        at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:868)
        at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:549)
        at org.springframework.context.support.GenericXmlApplicationContext.<init>(GenericXmlApplicationContext.java:71)
        at com.apress.springrecipes.calculator.Main.main(Main.java:11)
Caused by: java.lang.IllegalArgumentException: error at ::0 can't find referenced pointcut annotation
        at org.aspectj.weaver.tools.PointcutParser.parsePointcutExpression(PointcutParser.java:319)
        at org.springframework.aop.aspectj.AspectJExpressionPointcut.buildPointcutExpression(AspectJExpressionPointcut.java:226)
        at org.springframework.aop.aspectj.AspectJExpressionPointcut.obtainPointcutExpression(AspectJExpressionPointcut.java:197)
        at org.springframework.aop.aspectj.AspectJExpressionPointcut.getClassFilter(AspectJExpressionPointcut.java:176)
        at org.springframework.aop.support.AopUtils.canApply(AopUtils.java:224)
        at org.springframework.aop.support.AopUtils.canApply(AopUtils.java:283)
        at org.springframework.aop.support.AopUtils.findAdvisorsThatCanApply(AopUtils.java:315)
        at org.springframework.aop.framework.autoproxy.AbstractAdvisorAutoProxyCreator.findAdvisorsThatCanApply(AbstractAdvisorAutoProxyCreator.java:124)
        at org.springframework.aop.framework.autoproxy.AbstractAdvisorAutoProxyCreator.findEligibleAdvisors(AbstractAdvisorAutoProxyCreator.java:93)
        at org.springframework.aop.framework.autoproxy.AbstractAdvisorAutoProxyCreator.getAdvicesAndAdvisorsForBean(AbstractAdvisorAutoProxyCreator.java:74)
        at org.springframework.aop.framework.autoproxy.AbstractAutoProxyCreator.wrapIfNecessary(AbstractAutoProxyCreator.java:352)
        at org.springframework.aop.framework.autoproxy.AbstractAutoProxyCreator.postProcessAfterInitialization(AbstractAutoProxyCreator.java:304)
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyBeanPostProcessorsAfterInitialization(AbstractAutowireCapableBeanFactory.java:438)
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1714)
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:583)
        ... 10 more

然后我将切入点定义为

@Aspect
public class CalculatorPointcuts {

    @Pointcut("annotation(com.apress.springrecipes.calculator.LoggingRequired)")
    public void loggingOperation() {}

}

然后我将切入点应用到一个方面。这方面是记录方法的运行状态

@Aspect
@Component
public class CalculatorLoggingAspect {

    private Log log = LogFactory.getLog(this.getClass());

    @Before("CalculatorPointcuts.loggingOperation()")
    public void logBefore(JoinPoint joinPoint) {
        log.info("The method " + joinPoint.getSignature().getName()
              + "() begins with " + Arrays.toString(joinPoint.getArgs()));
    }

    @After("CalculatorPointcuts.loggingOperation()")
    public void logAfter(JoinPoint joinPoint) {
        log.info("The method " + joinPoint.getSignature().getName()
                + "() ends");
    }

}

介绍了算术计算器接口及其实现

public interface ArithmeticCalculator {

    public double add(double a, double b);
    public double sub(double a, double b);

}

@Component("arithmeticCalculator")
@LoggingRequired
public class ArithmeticCalculatorImpl implements ArithmeticCalculator {

    public double add(double a, double b) {
        return a + b;
    }

    public double sub(double a, double b) {
        return a - b;
    }

}

有人知道问题出在哪里吗

谢谢我注意到两件事

1）

@annotation

在方法级别工作，而不是在类级别。在

@Pointcut("@within(com.apress.springrecipes.calculator.LoggingRequired)")
public void loggingOperation() {}

2） 在另一个类引用中定义切入点将是另一个问题。而是在同一个类中定义它

@Aspect
@Component
public class CalculatorLoggingAspect {

    private Log log = LogFactory.getLog(this.getClass());

    @Pointcut("@within(com.apress.springrecipes.calculator.LoggingRequired)")
public void loggingOperation() {}  

    @Before("loggingOperation()")
    public void logBefore(JoinPoint joinPoint) {
        log.info("The method " + joinPoint.getSignature().getName()
              + "() begins with " + Arrays.toString(joinPoint.getArgs()));
    }

    @After("loggingOperation()")
    public void logAfter(JoinPoint joinPoint) {
        log.info("The method " + joinPoint.getSignature().getName()
                + "() ends");
    }

}

---

issue-57720747-aspect-logging-annotation

它应该是

@annotation

不是吗？它在添加@

@Aspect
@Component
public class CalculatorLoggingAspect {

    private Log log = LogFactory.getLog(this.getClass());

    @Pointcut("@within(com.apress.springrecipes.calculator.LoggingRequired)")
public void loggingOperation() {}  

    @Before("loggingOperation()")
    public void logBefore(JoinPoint joinPoint) {
        log.info("The method " + joinPoint.getSignature().getName()
              + "() begins with " + Arrays.toString(joinPoint.getArgs()));
    }

    @After("loggingOperation()")
    public void logAfter(JoinPoint joinPoint) {
        log.info("The method " + joinPoint.getSignature().getName()
                + "() ends");
    }

}