本文介紹了Spring 4 AOP：在切入點中獲取異常java.lang.IlLegalArgumentException：Error at：：0 Formal Unbinded in PointCut的處理方法，對大家解決問題具有一定的參考價值，需要的朋友們下面隨著小編來一起學習吧！
問題描述
我正在嘗試使用Spring建議參數運行一個Spring AOP演示程序。在執行下面的代碼時，我收到異常”java.lang.IlLegalArgumentException：Error at：：0 Formal Unbinded in PointCut”。請幫助我了解以下代碼的錯誤之處。
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>
異常：
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
推薦答案
如果在方面的建議中不需要方法參數值，則不應該使用args()，只需在切入點中指定方法簽名，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) {}
只有當您確實需要訪問參數時，如您的代碼所示，您應該使用args()，但然后您還需要將參數添加到切入點，而不僅僅是通知。如果您直接在通知中定義切入點，則只需定義一次。單獨定義切入點僅在您希望在同一方面的多個建議中重用相同切入點時，IMO才有幫助。無論如何，您想要做的是修復您的代碼(我沒有運行它，只是編寫了這個”免提”)：
@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) {}
順便說一句，錯誤消息”Formal Unbinded in PointCut”表示您沒有在Viaargs()、this()、target()或@target()中正確綁定通知方法簽名中的形參。或者反過來，切入點語法是正確的，但方法簽名是錯誤的。
這篇關于Spring 4 AOP：在切入點中獲取異常java.lang.IlLegalArgumentException：Error at：：0 Formal Unbinded in PointCut的文章就介紹到這了，希望我們推薦的答案對大家有所幫助，
