关键词
JavaEE JavaWeb eclipse XML AspectJ
形容
1.报错记录。摸索中。轻喷。
2.《Java EE框架整合开发入门到实战:Spring+Spring MVC+MyBatis(微课版)》4.4节“基于XML配置开发AspectJ”
报错
正告: Exception encountered during context initialization – cancelling refresh attempt: org.springframework.beans.factory.BeanCreationException: Error creating bean with name ‘testDao’ defined in class path resource [aspectj/xml/applicationContext.xml]: BeanPostProcessor before instantiation of bean failed; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name ‘org.springframework.aop.aspectj.AspectJPointcutAdvisor#1’: Cannot create inner bean ‘(inner bean)#57175e74’ of type [org.springframework.aop.aspectj.AspectJAfterReturningAdvice] while setting constructor argument; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name ‘(inner bean)#57175e74’: Cannot create inner bean ‘(inner bean)#7bb58ca3’ of type [org.springframework.aop.config.MethodLocatingFactoryBean] while setting constructor argument; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name ‘(inner bean)#7bb58ca3’: Initialization of bean failed; nested exception is java.lang.IllegalArgumentException: Unable to locate method [afterReturning] on bean [myAspect]
查看
拖到最左边查看报错
Unable to locate method [afterReturning] on bean [myAspect]
就是说bean实例myAspect中的办法afterReturning有问题。
查看MyAspect.java中的办法afterReturning。与applicationContext.xml对应地位进行比拟。
发现是MyAspect.java中的办法afterReturning拼写有问题(多写了个n)。与applicationContext.xml对应不上。
解决
将MyAspect.java中的办法afterReturnning改为afterReturning。与applicationContext.xml中的afterReturning对应上。
总结
1.查看eclipse报错局部的最下面的最左边
2.查看xml文件以及报错提醒的bean对应java文件。
(补充)我的项目
构造
package aspectj.xml;
applicationContext.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:aop="http://www.springframework.org/schema/aop"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop.xsd">
<!-- 定义指标对象,应用4.2.1节的实现类-->
<bean id="testDao" class="dynamic.jdk.TestDaoImpl"/>
<!-- 定义切面-->
<bean id="myAspect" class="aspectj.xml.MyAspect"/>
<!-- AOP配置 -->
<aop:config>
<!-- 配置切面 -->
<aop:aspect ref="myAspect">
<!-- 配置切入点,告诉加强哪些办法 -->
<aop:pointcut expression="execution(* dynamic.jdk.*.*(..))" id="myPointCut"/>
<!-- 将告诉与切入点关联 -->
<!-- 关联前置告诉 -->
<aop:before method="before" pointcut-ref="myPointCut" />
<!-- 关联后置返回告诉,在指标办法胜利执行后执行 -->
<aop:after-returning method="afterReturning" pointcut-ref="myPointCut"/>
<!-- 关联盘绕告诉-->
<aop:around method="around" pointcut-ref="myPointCut"/>
<!-- 关联异样告诉,没有异样产生时将不会执行加强,throwing属性设置告诉的第二个参数名称-->
<aop:after-throwing method="except" pointcut-ref="myPointCut" throwing="e"/>
<!-- 关联后置(最终)告诉,不论指标办法是否胜利都要执行-->
<aop:after method="after" pointcut-ref="myPointCut"/>
</aop:aspect>
</aop:config>
</beans>
MyAspect.java
package aspectj.xml;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.ProceedingJoinPoint;
//切面类,在此类中编写各种类型的告诉
public class MyAspect {
//前置告诉,应用JoinPoint接口作为参数取得指标对象信息
public void before(JoinPoint jp){
System.out.println("前置告诉:模仿权限管制");
System.out.println(",指标类对象:"+jp.getTarget()+",被加强解决的办法:"+jp.getSignature().getName());
}
//后置返回告诉
public void afterReturnning(JoinPoint jp){
System.out.println("后置返回告诉:"+"模仿删除临时文件");
System.out.println(",被加强解决的办法"+jp.getSignature().getName());
}
/**
* 盘绕告诉
* ProceedingJoinPoint是JoinPoint的子接口,代表能够执行的指标办法
* 返回值的类型必须是一个Object
* 必须一个参数是ProceedingJoinPoint类型
* 必须throws Throwable
* @param pjp
* @return
* @throws Throwable
*/
public Object around(ProceedingJoinPoint pjp) throws Throwable{
//开始
System.out.println("盘绕开始:执行指标办法前,模仿开始事务");
//执行以后指标办法
Object obj = pjp.proceed();
//完结
System.out.println("盘绕完结:执行指标办法后,模仿敞开事务");
return obj;
}
//异样告诉
public void except(Throwable e){
System.out.println("异样告诉:"+"程序执行异样"+e.getMessage());
}
//后置(最终)告诉
public void after(){
System.out.println("最终告诉:模仿开释资源");
}
}
XMLAspectJTest.java
package aspectj.xml;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import dynamic.jdk.TestDao;
public class XMLAspectJTest {
//在主办法中应用Spring容器获取代理对象,并执行指标办法
public static void main(String[] args) {
ApplicationContext appCon = new ClassPathXmlApplicationContext("/aspectj/xml/applicationContext.xml");
//从容器中获取加强后的指标对象
TestDao testDaoAdvice = (TestDao)appCon.getBean("testDao");
//执行办法
testDaoAdvice.save();
/*
前置告诉:模仿权限管制
,指标类对象:dynamic.jdk.TestDaoImpl@45b9a632,被加强解决的办法:save
盘绕开始:执行指标办法前,模仿开始事务
保留
最终告诉:模仿开释资源
盘绕完结:执行指标办法后,模仿敞开事务
后置返回告诉:模仿删除临时文件
,被加强解决的办法save
*/
}
}
package dynamic.jdk;
TestDao.java
package dynamic.jdk;
public interface TestDao {
public void save();
public void modify();
public void delete();
}
TestDaoImpl.java
package dynamic.jdk;
//该实现类作为指标类,在代理类中对实现类的办法进行加强解决
public class TestDaoImpl implements TestDao {
@Override
public void save() {
System.out.println("保留");
}
@Override
public void modify() {
System.out.println("批改");
}
@Override
public void delete() {
System.out.println("删除");
}
}
运行后果(运行XMLAspectJTest.java)
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