Question

我正在尝试使用Spring AOP和AspectJ创建Aspect。

@Aspect(value = "perthis(execution(* x.y.z.command.Command.execute()))")
public class CommandAdvice {

     // Advices....
}

'atatbute'的Javadoc说： -

Per clause expression, defaults to singleton aspect.
Valid values are "" (singleton), "perthis(...)", etc

Everything工作文件而不指定@Aspect注释中的'value'属性。

使用上述相关设置导致以下异常： -

Caused by: java.lang.IllegalArgumentException: Bean with name 'commandAspect' is a singleton, but aspect instantiation model is not singleton.

所以我尝试将advice bean的范围改为原型： -

<bean id="commandAspect" class="x.y.z.command.CommandAdvice" **scope="prototype"**
    factory-method="aspectOf" />

这导致： -

Caused by: java.lang.IllegalArgumentException: Can not set x.y.z.command.Command field x.y.z.test.CommandTest.command to sun.proxy.$Proxy30
at sun.reflect.UnsafeFieldAccessorImpl.throwSetIllegalArgumentException(UnsafeFieldAccessorImpl.java:146)
at sun.reflect.UnsafeFieldAccessorImpl.throwSetIllegalArgumentException(UnsafeFieldAccessorImpl.java:150)
at sun.reflect.UnsafeObjectFieldAccessorImpl.set(UnsafeObjectFieldAccessorImpl.java:63)
at java.lang.reflect.Field.set(Field.java:657)
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:502)

我的要求是创建'prototype'范围的Aspect bean。

原型Aspect bean是否可取？多线程环境中的优点和缺点是什么？
如何使用'value'属性进行操作？

java - @Aspect value attribute - Prototype范围的方面bean

0 个答案: