我正在尝试使用Spring AOP,以下是Spring配置文件:
<?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:util="http://www.springframework.org/schema/util" xmlns:aop="http://www.springframework.org/schema/aop"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd
http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-3.0.xsd
http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.0.xsd">
<bean id="eddie" class="com.springinaction.Instrumentalist">
<property name="instrument" ref="violin"></property>
<property name="song" value="Samarame"></property>
</bean>
<bean id="kenny" class="com.springinaction.Instrumentalist">
<property name="song" value="SAMARAME "></property>
<property name="instrument" ref="saxopone"></property>
</bean>
<bean id="hank" class="com.springinaction.OneManBand">
<property name="instruments">
<props>
<prop key="GUITAR">STRUM STRUM STRUM</prop>
<prop key="CYMBAL">CRASH CRASH CRASH CRASH</prop>
<prop key="HARMONICA">HUM HUM HUM</prop>
</props>
</property>
</bean>
<bean id="guitar" class="com.springinaction.Guitar">
</bean>
<bean id="violin" class="com.springinaction.Violin">
</bean>
<bean id="tabala" class="com.springinaction.Tabala">
</bean>
<bean id="saxopone" class="com.springinaction.Saxophone">
</bean>
<bean id="audience" class="com.springinaction.Audience"></bean>
<aop:config>
<aop:aspect ref="audience">
<aop:before pointcut="execution(* com.springinaction.Performer.perform(..))" method="takeSeats()"/>
</aop:aspect>
</aop:config>
</beans>
当我运行代码时,出现错误提示:
“主线程中的异常 org.springframework.beans.factory.BeanNotOfRequiredTypeException: 名称为'eddie'的bean必须是类型为[com.springinaction.Instrumentalist], 但实际上是类型[$Proxy4]”。 在AbstractBeanFactory.java:348处, org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:348) at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:193) at org.springframework.context.support.AbstractApplicationContext.getBean(AbstractApplicationContext.java:1008) at com.springinaction.Main.main(Main.java:12)
如果我在Spring配置文件中注释掉元素,则可以完美运行。
为什么会发生这种情况?