java-使用ProxyFactoryBean时发生异常
作者：互联网
我正在尝试实现ProxyFactoryBean以创建AOP代理,但出现一些错误.谁能告诉我我要去哪里错了.
代码和异常跟踪如下所示：
Perfomer.java
public interface Performer {
public void perform();
}
Juggler.java
public class Juggler implements Performer {
private int beanBags;
public Juggler(){
beanBags =3;
}
public Juggler (int beanBags){
this.beanBags=beanBags;
}
@Override
public void perform() {
System.out.println("Juggling "+beanBags+" BeanBags...");
}
}
Audience.java
@Aspect
public class Audience{
@Pointcut("execution(* com.org.Performer.perform(..))")
public void performance(){}
@Before("performance()")
public void takeSeats(){
System.out.println("The audience is taking their seats.");
}
@Before("performance()")
public void turnOffCellPhones(){
System.out.println("The audience is turning off their cellphones.");
}
@AfterReturning("performance()")
public void applaud(){
System.out.println("CLAP CLAP CLAP CLAP CLAP");
}
@AfterThrowing("performance()")
public void demandRefund(){
System.out.println("Boo! We want our money back!");
}
@After("performance()")
public void goHome(){
System.out.println("The audience is going home!");
}
@Around("performance()")
public void watchTime(ProceedingJoinPoint joinPoint){
try{
long startTime=System.currentTimeMillis();
joinPoint.proceed();
long endTime=System.currentTimeMillis();
System.out.println("Time taken: "+(endTime-startTime));
}
catch (Throwable t){t.printStackTrace();}
}
}
TestClass.java
public class TestClass {
public static void main(String args[]) {
ApplicationContext applicationContext=new ClassPathXmlApplicationContext("spring-config.xml");
Performer performer=(Performer)applicationContext.getBean("proxyDuke");
performer.perform();
}
}
spring-config.xml
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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/aop
http://www.springframework.org/schema/aop/spring-aop-3.0.xsd">
<bean id="Duke" class="com.org.Juggler" ><constructor-arg value="15" /></bean>
<bean id="audience" class="com.org.Audience"/>
<bean id="debugInterceptor" class="org.springframework.aop.interceptor.DebugInterceptor"/>
<bean id="proxyDuke" class="org.springframework.aop.framework.ProxyFactoryBean">
<property name="target" ref="Duke"/>
<property name="interceptorNames">
<list>
<value>audience</value>
<value>debugInterceptor</value>
</list>
</property>
</bean>
<aop:scoped-proxy proxy-target-class="false" />
</beans>
但是正在给出以下例外
例外情况：
Exception in thread "main" org.springframework.beans.factory.parsing.BeanDefinitionParsingException: Configuration problem: Cannot locate BeanDefinitionParser for element [scoped-proxy]
Offending resource: class path resource [spring-config.xml]
at org.springframework.beans.factory.parsing.FailFastProblemReporter.fatal(FailFastProblemReporter.java:59)
at org.springframework.beans.factory.parsing.ReaderContext.fatal(ReaderContext.java:68)
at org.springframework.beans.factory.parsing.ReaderContext.fatal(ReaderContext.java:55)
at org.springframework.beans.factory.xml.NamespaceHandlerSupport.findParserForElement(NamespaceHandlerSupport.java:84)
at org.springframework.beans.factory.xml.NamespaceHandlerSupport.parse(NamespaceHandlerSupport.java:73)
at org.springframework.beans.factory.xml.BeanDefinitionParserDelegate.parseCustomElement(BeanDefinitionParserDelegate.java:1419)
at org.springframework.beans.factory.xml.BeanDefinitionParserDelegate.parseCustomElement(BeanDefinitionParserDelegate.java:1409)
at org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader.parseBeanDefinitions(DefaultBeanDefinitionDocumentReader.java:184)
at org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader.doRegisterBeanDefinitions(DefaultBeanDefinitionDocumentReader.java:140)
at org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader.registerBeanDefinitions(DefaultBeanDefinitionDocumentReader.java:111)
at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.registerBeanDefinitions(XmlBeanDefinitionReader.java:493)
at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.doLoadBeanDefinitions(XmlBeanDefinitionReader.java:390)
at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions(XmlBeanDefinitionReader.java:334)
at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions(XmlBeanDefinitionReader.java:302)
at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:174)
at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:209)
at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:180)
at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:243)
at org.springframework.context.support.AbstractXmlApplicationContext.loadBeanDefinitions(AbstractXmlApplicationContext.java:127)
at org.springframework.context.support.AbstractXmlApplicationContext.loadBeanDefinitions(AbstractXmlApplicationContext.java:93)
at org.springframework.context.support.AbstractRefreshableApplicationContext.refreshBeanFactory(AbstractRefreshableApplicationContext.java:131)
at org.springframework.context.support.AbstractApplicationContext.obtainFreshBeanFactory(AbstractApplicationContext.java:522)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:436)
at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:139)
at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:83)
at com.org.TestClass.main(TestClass.java:15)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:601)
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:120)
解决方法:
作为最初的检查,运行测试时,请检查类路径上是否有spring-aop jar.如果您查看org.springframework.aop.config.AopNamespaceHandler中的init方法(这是aop名称空间的默认处理程序),它将为“ scoped-proxy”注册该处理程序.
HTH！
詹姆士
附录：
更详细地查看后,问题是您无法指定：
<aop:scoped-proxy proxy-target-class="false" />
作为独立元素.它必须在bean定义内,即：
<bean id="Duke" class="com.org.Juggler">
<constructor-arg value="15" />
<aop:scoped-proxy proxy-target-class="false" />
</bean>
如果您不希望任何bean成为cglib代理,请使用：
<aop:config proxy-target-class="false" />
还有其他问题,例如在为ProxyFactoryBean指定拦截器名称时,它们必须为Advice,Advisor,Interceptor等类型,而受众群体则不是.如果可以省略调试拦截器bean,则只需定义以下内容：
<bean id="Duke" class="com.org.Juggler">
<constructor-arg value="15" />
</bean>
<bean id="audience" class="com.org.Audience" />
<aop:aspectj-autoproxy proxy-target-class="false" />
最后一行< aop：aspectj-autoproxy ..... />将在已定义的类和自动代理的Juggler中检查注释.
最后,您需要更改代码,以便检索“ Duke”而不是代理.
Performer performer = (Performer)applicationContext.getBean("Duke");
performer.perform();
标签：spring-aop,spring,java 来源： https://codeday.me/bug/20191031/1978706.html