使用@ AOP java.lang.StackOverflowError的AOP弹簧
使用@ AOP java.lang.StackOverflowError的AOP弹簧
提问于 2016-11-04 13:21:57
我正在努力学习AOP春天。因此，我已经在露娜eclipse中安装了AspectJ插件并创建了AspectJ项目，下面是项目探索的快照：
项目探索1：https://i.stack.imgur.com/el0TZ.jpg
这是我的密码：
AopMain.java
package org.koushik.javabrains;
import org.koushik.javabrains.service.ShapeService;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class AopMain {
public static void main(String[] args) {
ApplicationContext ctx = new
ClassPathXmlApplicationContext("spring.xml");
ShapeService shapeService = ctx.getBean("shapeService",ShapeService.class);
System.out.println(shapeService.getCircle().getCircleName());
}
}LoggingAspect.java
package org.koushik.javabrains.aspect;
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;
@Aspect
public class LoggingAspect {
@Before( "allCircleMethod()")
public void loggingAdvice(JoinPoint joinPoint){
System.out.println(joinPoint.toString());
}
//@Before("args(name)")
//public void stringArgumentMethods(String name){
// System.out.println("name: "+name);
//}
@Pointcut("execution(* get*())")
public void allGetters(){}
@Pointcut("within(org.koushik.javabrains.model.Circle)")
public void allCircleMethod(){}
}Circle.java
package org.koushik.javabrains.model;
public class Circle {
private String circleName;
public String getCircleName() {
return circleName;
}
public void setCircleName(String circleName) {
this.circleName = circleName;
}
}Triangle.java
package org.koushik.javabrains.model;
public class Triangle {
private String triangleName;
public String getTriangleName() {
return triangleName;
}
public void setTriangleName(String triangleName) {
this.triangleName = triangleName;
}
}ShapeServices.java
package org.koushik.javabrains.service;
import org.koushik.javabrains.model.Circle;
import org.koushik.javabrains.model.Triangle;
public class ShapeService {
private Circle circle;
private Triangle triangle;
public Circle getCircle() {
return circle;
}
public void setCircle(Circle circle) {
this.circle = circle;
}
public Triangle getTriangle() {
return triangle;
}
public void setTriangle(Triangle triangle) {
this.triangle = triangle;
}
}spring.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"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-2.0.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop-2.0.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-2.5.xsd">
<aop:aspectj-autoproxy></aop:aspectj-autoproxy>
<bean name="triangle" class="org.koushik.javabrains.model.Triangle">
<property name="name" value ="Triangle name"></property>
</bean>
<bean name="circle" class="org.koushik.javabrains.model.Circle">
<property name="name" value ="Circle Name"></property>
</bean>
<bean name="shapeService" class="org.koushik.javabrains.service.ShapeService" autowire="byName"/>
<bean name ="loggingAspect" class ="org.koushik.javabrains.aspect.LoggingAspect"/>
</beans>代码可以正常工作，无需在LoggingAspect.java中使用。
@Before("args(name)")
public void stringArgumentMethods(String name){
System.out.println("name: "+name);
}但是，当我添加它时，我将得到java.lang.stackOverflowError：
Exception in thread "main" java.lang.StackOverflowError
at org.koushik.javabrains.aspect.LoggingAspect.stringArgumentMethods(LoggingAspect.java)
at org.koushik.javabrains.aspect.LoggingAspect.stringArgumentMethods(LoggingAspect.java)
at org.koushik.javabrains.aspect.LoggingAspect.stringArgumentMethods(LoggingAspect.java)
at org.koushik.javabrains.aspect.LoggingAspect.stringArgumentMethods(LoggingAspect.java)
at org.koushik.javabrains.aspect.LoggingAspect.stringArgumentMethods(LoggingAspect.java)
at org.koushik.javabrains.aspect.LoggingAspect.stringArgumentMethods(LoggingAspect.java)
at org.koushik.javabrains.aspect.LoggingAspect.stringArgumentMethods(LoggingAspect.java)
at org.koushik.javabrains.aspect.LoggingAspect.stringArgumentMethods(LoggingAspect.java)
at org.koushik.javabrains.aspect.LoggingAspect.stringArgumentMethods(LoggingAspect.java)
at org.koushik.javabrains.aspect.LoggingAspect.stringArgumentMethods(LoggingAspect.java)
at org.koushik.javabrains.aspect.LoggingAspect.stringArgumentMethods(LoggingAspect.java)
at org.koushik.javabrains.aspect.LoggingAspect.stringArgumentMethods(LoggingAspect.java)
at org.koushik.javabrains.aspect.LoggingAspect.stringArgumentMethods(LoggingAspect.java)有人能告诉我为什么会发生这种事吗？怎么能解决呢？
回答 1
Stack Overflow用户
发布于 2016-11-04 13:46:10
从java文档，
StackOverFlowError -什么：
由于应用程序递归太深而发生堆栈溢出时引发。
这意味着，内存(堆栈)是完全的，没有空间可以进一步存储。
为什么：
在中，大多数情况都是通过方法的调用来创建的。
在您的例子中，，@Before("args(name)") --这一行试图找到带有参数"name“的ALL方法，发现自己是(导致递归调用)，堆栈溢出error.Because stringArgumentMethods(String name)也有参数name。
public void stringArgumentMethods(String name){
System.out.println("name: "+name);}
如何解决：
要么重写AspectJ表达式- @Before("args(name)")
或
将参数重命名为stringArgumentMethods(String name123)
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/40423768
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