Spring AOP创建了额外的bean [英] Spring AOP creates extra bean
问题描述
我正在玩Spring AOP。
I 'm playing with Spring AOP.
这是一个简单的类
public class CModel extends Car {
private double torqueMeasure = 1;
public CModel() {
System.out.println(" C-Model constructor");
}
}
Spring配置就像这样
And Spring configuration is like this
<aop:config>
<aop:aspect ref="audit">
<aop:before pointcut="execution(* com.test.main..*(..))" method="firstControl"/>
...
</aop:aspect>
</aop:config>
现在好了;当我添加aop:config并拦截CModel然后Spring调用CModel构造函数两次。这意味着Spring创建了2个CModel对象,对吗?
Ok now; when i add aop:config and intercepts CModel then Spring calls CModel constructor twice. It means Spring creates 2 CModel object, right ?
如果我删除AOP配置,那么Spring只创建一个CModel对象。
If I delete AOP config then Spring creates only one CModel object.
知道为什么会这样吗?
谢谢。
推荐答案
虽然我不确定,但我的猜测是spring首先实例化常规类,然后创建一个CGLIB代理,它是一个子类。请注意,对于初始化,您应该使用 @PostConstruct
,保证使用一次。
Though I'm not sure, my guess is that spring first instantiates the regular class, and then makes a CGLIB proxy, which is a subclass. Note that for initialization you should use @PostConstruct
, which is guaranteed to be used once.
验证我的假设,在构造函数中添加一个断点,并查看它何时被调用 - 其中一次应该在 CModel $ EnhancedByCGLIB
之后
To verify my hypothesis, add a breakpoint in the constructor and see when it is invoked - one of the times it should be right after the CModel$EnhancedByCGLIB
something
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