AspectJ - JRE 类私有方法的加载时编织、特权方面和切入点

问题描述

我正在尝试在私有方法 java.net.AbstractSocketImpl.connectToAddress(..) 上设置切入点，并且我想使用加载时编织.这是我的测试代码:

I'm trying to set pointcut on private method java.net.AbstractSocketImpl.connectToAddress(..) and I want to use load-time weaving. This is my test code:

public class Main {
    public static void main(String args[]) throws Throwable {
        new java.net.Socket("localhost", 10111);
    }
}

这是我的特权方面:

privileged aspect PrivAspect {
    before() : call(* java.net.AbstractPlainSocketImpl.connectToAddress(..)) {
        System.out.println("It works");
    }
}

这是 META-INF/aop.xml

and this is META-INF/aop.xml

<aspectj>
  <aspects>
    <aspect name="PrivAspect"/>
  </aspects>
  <weaver options="-verbose -Xset:weaveJavaPackages=true"/>
</aspectj>

这是我编译代码的方式:

This is how I compile code:

$ javac Main.java
$ java -jar ../lib/aspectjtools-1.6.11.jar -source 6 -cp .:$CLASSPATH PrivAspect.aj
[warning] this affected type is not exposed to the weaver: java.net.AbstractPlainSocketImpl (needed for privileged access) [Xlint:typeNotExposedToWeaver]

/home/batto/work/ajtest/test/PrivAspect.aj:2 [warning] advice defined in PrivAspect has not been applied [Xlint:adviceDidNotMatch]


2 warnings
$ java -cp .:$CLASSPATH -javaagent:../lib/aspectjweaver-1.6.11.jar Main

最后一行抛出预期的连接被拒绝"异常(端口已关闭)但未调用建议.

The last line throws expected "connection refused" exception (port is closed) but advice is not invoked.

有什么问题吗?

谢谢.

我知道调用了 java.net.AbstractPlainSocketImpl.connectToAddress(..)(我在 Eclipse 中调试了 Main).

I know that java.net.AbstractPlainSocketImpl.connectToAddress(..) is called (I debugged Main in Eclipse).

推荐答案

这看起来像是编译后编织，参考了 inpath (java.net.AbstractPlainSocketImpl) 上未指定的类.有必要明确指定 AspectJ 将编织"哪些 .class/.jar 文件.在此处查看更多详细信息:http://www.eclipse.org/aspectj/doc/released/devguide/ajc-ref.html

This seems like post compile-time weaving with reference to a class not specified on the inpath (java.net.AbstractPlainSocketImpl). It is necessary to specify explicitly which .class/.jar files are to be "woven" by AspectJ. See more details here: http://www.eclipse.org/aspectj/doc/released/devguide/ajc-ref.html

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