问Spring4aop:获取异常java.lang.IllegalArgumentException:在切入点中出现错误:0
EN

Stack Overflow用户

提问于 2019-01-20 09:20:32

回答 1查看 1K关注 0票数 1

我正在尝试使用Spring建议参数运行Spring演示程序。在执行下面的代码时，我得到了异常"java.lang.IllegalArgumentException: error at ::0，形式上在切入点中未绑定“。请帮助我理解下面的代码有什么问题。

Performance.java

package com.aop.annotations.example4;

public interface Performance {

    public void perform(int performanceNum, String performanceName) throws Exception;

    public void buyTicket(int price) throws Exception;
}

CircusPerformance.java

package com.aop.annotations.example4;

public class CircusPerformance implements Performance {

    @Override
    public void perform(int performanceNum, String performanceName) throws Exception {
        System.out.println("Circus Performance number:"+performanceNum+" and Performance name :"+performanceName+" in progress..");
    }

    @Override
    public void buyTicket(int price){
        System.out.println("Buy Ticket for Circus performance");
    }
}

DancePerformance.java

package com.aop.annotations.example4;

public class DancePerformance implements Performance{

    @Override
    public void perform(int performanceNum, String performanceName) throws Exception {
        System.out.println("Dance Performance number:"+performanceNum+" and Performance name :"+performanceName+" in progress..");
    }

    @Override
    public void buyTicket(int price) throws Exception {
        System.out.println("Buy Ticket for Dance performance");
    }
}

Audience.java

package com.aop.annotations.example4;

import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.After;
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 Audience {
    @Pointcut("execution(* com.aop.annotations.example4.Performance.*(..)) && args(int,String)")
    public void performance() {
    }

    @Pointcut("execution(* com.aop.annotations.example4.Performance.*(..)) && args(int)")
    public void buyTicket() {
    }

    @After("buyTicket()")
    public void afterTicket(JoinPoint jp, int price) {
        System.out.println("Start of method: " + jp.getSignature().getName() + " of Class: "
                + jp.getTarget().getClass().getSimpleName());
        System.out.println("Buying Ticket of Price :" + price);
        System.out.println("Silencing cell phones");
        System.out.println("Taking seats");
    }

    @Before("performance()")
    public void beforePerformance(JoinPoint jp, int performanceNum, String performanceName) {
        System.out.println("Start of method: " + jp.getSignature().getName() + " of Class: "
                + jp.getTarget().getClass().getSimpleName());
        System.out.println("Performance Number :" + performanceNum + "+ is :" + performanceName);
    }

    @After("performance()")
    public void afterPerformance(JoinPoint jp,int performanceNum, String performanceName) {
        System.out.println("End of method: " + jp.getSignature().getName() + " of Class: "
                + jp.getTarget().getClass().getSimpleName());
        System.out.println("End of PerformanceName :" + performanceName);
        System.out.println("CLAP CLAP CLAP!!!");
    }

}

TestAOPMain.java

package com.aop.annotations.example4;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class TestAOPMain {

    public static void main(String args[]) {
        try {
            ApplicationContext context = new ClassPathXmlApplicationContext("appContext4.xml");
            Performance dancePerformance = context.getBean("dance", DancePerformance.class);
            dancePerformance.buyTicket(100);
            dancePerformance.perform(1,"Bhangra Dance");
            dancePerformance.perform(2,"Garba Dance");
            dancePerformance.perform(3,"Bharatnatyam Dance");
            dancePerformance.perform(4,"Folk Dance");

            Performance circusPerformance = (CircusPerformance) context.getBean("circus");
            circusPerformance.buyTicket(200);
            circusPerformance.perform(1,"Ball Juggling");
            circusPerformance.perform(2,"Animal act");
            circusPerformance.perform(3,"Rope Jump");
            circusPerformance.perform(4,"Magic Show");

        } catch (Exception e) {
            System.out.println(e.getMessage());
        }

    }

}

aopContext4.xml:

<?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:context="http://www.springframework.org/schema/context"
    xmlns:aop="http://www.springframework.org/schema/aop"
    xsi:schemaLocation="http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop.xsd
http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context.xsd">
    <context:component-scan base-package="com.aop.annotations.example4" />
    <aop:aspectj-autoproxy proxy-target-class="true" />
    <bean id = "dance" class="com.aop.annotations.example4.DancePerformance" />
    <bean id = "circus" class="com.aop.annotations.example4.CircusPerformance" />
</beans>

异常：

WARNING: Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'org.springframework.context.event.internalEventListenerProcessor': Initialization of bean failed; nested exception is java.lang.IllegalArgumentException: error at ::0 formal unbound in pointcut 
Error creating bean with name 'org.springframework.context.event.internalEventListenerProcessor': Initialization of bean failed; nested exception is java.lang.IllegalArgumentException: error at ::0 formal unbound in pointcut

jakarta-ee

spring-aop

spring-4

java

spring

回答 1

Stack Overflow用户

发布于 2019-02-16 18:33:53

如果不需要方面的通知中的方法参数值，则不应该使用args()，而应该在切入点中指定方法签名，如下所示：

@Pointcut("execution(* com.aop.annotations.example4.Performance.*(int, String))")
public void performance() {}

@Pointcut("execution(* com.aop.annotations.example4.Performance.*(int))")
public void buyTicket(int price) {}

只有当您确实需要访问参数时，正如您的代码所暗示的那样，您应该使用args()，但也需要将参数添加到切入点，而不仅仅是添加到建议中。如果直接在通知中定义切入点，则只需执行一次。单独定义切入点，仅当您想在同一方面的多个建议中重复使用相同的切入点时，IMO才有帮助。无论如何，您要做的是修复您的代码(我没有运行它，只是写了这个“免费”)：

@Pointcut("execution(* com.aop.annotations.example4.Performance.*(..)) && args(performanceNum, performanceName)")
public void performance(int performanceNum, String performanceName) {}

@Pointcut("execution(* com.aop.annotations.example4.Performance.*(..)) && args(price)")
public void buyTicket(int price) {}