java - 在 Java 代理中重定位 AspectJ 包

Question

我正在使用 AspectJ 来监控字段访问和字段修改。我有一个 gradle 项目，它编译这两个方面，并使用 gradle shadow 插件将该 jar 与 aspectjrt 和 aspectjweaver 一起打包在一个阴影 jar 中。代理仍然是 org.aspectj.weaver.loadtime.Agent。一切正常，但当我尝试重新定位 aspectj 包时出现错误。

影子插件配置为:

shadowJar {
    relocate 'org.aspectj', 'shadow.org.aspectj'
    relocate 'aj.org.objectweb.asm', 'shadow.aj.org.objectweb.asm'
}

list :

jar {
    manifest {
        attributes("Premain-Class": "shadow.org.aspectj.weaver.loadtime.Agent",
                "Can-Redefine-Classes": true,
                "Can-Retransform-Classes":true)
    }
}

这是反编译的方面类，所以看起来是正确的:

package com.vfunction.singletonanalysis;

import shadow.org.aspectj.lang.JoinPoint;
import shadow.org.aspectj.lang.NoAspectBoundException;
import shadow.org.aspectj.lang.annotation.Aspect;
import shadow.org.aspectj.lang.annotation.Before;

@Aspect
public class StaticFieldBeforeAccessAspect extends AbstractFieldAccessAspect {
    public StaticFieldBeforeAccessAspect() {
    }

    @Before("callAt()")
    public void before(JoinPoint joinPoint) throws Throwable {
        this.printJoinPoint(joinPoint);
    }

    public static StaticFieldBeforeAccessAspect aspectOf() {
        if (ajc$perSingletonInstance == null) {
            throw new NoAspectBoundException("com.vfunction.singletonanalysis.StaticFieldBeforeAccessAspect", ajc$initFailureCause);
        } else {
            return ajc$perSingletonInstance;
        }
    }

    public static boolean hasAspect() {
        return ajc$perSingletonInstance != null;
    }

    static {
        try {
            ajc$postClinit();
        } catch (Throwable var1) {
            ajc$initFailureCause = var1;
        }

    }
}

但是当我试图运行一个测试程序时，我仍然得到一个错误，说找到的类型不是一个方面:

[AppClassLoader@18b4aac2] info AspectJ Weaver Version 1.8.12 built on Friday Oct 20, 2017 at 21:58:11 GMT
[AppClassLoader@18b4aac2] info register classloader sun.misc.Launcher$AppClassLoader@18b4aac2
[AppClassLoader@18b4aac2] info using configuration file:***/workspace/singleton-analysis/agent/build/libs/agent-1.0.0-SNAPSHOT-all.jar!/META-INF/aop.xml
[AppClassLoader@18b4aac2] info register aspect com.vfunction.singletonanalysis.StaticFieldModifyAspect
[AppClassLoader@18b4aac2] error The specified aspect 'com.vfunction.singletonanalysis.StaticFieldModifyAspect' cannot be found
[AppClassLoader@18b4aac2] info register aspect com.vfunction.singletonanalysis.StaticFieldAccessAspect
[AppClassLoader@18b4aac2] error The specified aspect 'com.vfunction.singletonanalysis.StaticFieldAccessAspect' cannot be found
[AppClassLoader@18b4aac2] info register aspect com.vfunction.singletonanalysis.StaticFieldBeforeAccessAspect
[AppClassLoader@18b4aac2] error Cannot register 'com.vfunction.singletonanalysis.StaticFieldBeforeAccessAspect' because the type found with that name is not an aspect

Answer 1

检查阴影 jar 中 aop.xml 的内容。方面类名是否被遮蔽？我怀疑它没有给出错误消息。

As mentioned in documentation ，你可以让 Shadow 插件像这样转换 XML 文件:

shadowJar {
    tranform(XmlAppendingTransformer.class) {
        resource = 'aop.xml'
    }
}