英文:
Self-injecting java agent
问题
我正在尝试创建一个能自我注入的Java代理（java agent）。代理和动态加载代理的代码将包含在同一个JAR文件中。
我尝试通过在清单（manifest）文件中同时定义 Main-Class 和 Agent-Class 来实现此目标。以下是该文件内容：
Manifest-Version: 1.0
Main-Class: myjar.injector
Agent-Class: myjar.agent
然而，当我运行该JAR文件时，出现以下错误：
com.sun.tools.attach.AgentLoadException: 找不到代理 (Agent) JAR 文件或找不到 Agent-Class 属性
当我检查编译后的JAR文件时，发现只有一个 Main-Class 属性在JAR文件的清单中。我尝试在我的集成开发环境（IDE）之外重新编译，但仍然只有 Main-Class 属性。
是否有任何方法可以在一个JAR文件中同时包含 Main-Class 和 Agent-Class 两者呢？
英文:
I am trying to create a self-injecting java agent. The agent and the code to dynamically load the agent would be contained in the same jar file.
I tried to do this by defining both Main-Class and Agent-Class in the manifest file. This is the file:
Manifest-Version: 1.0
Main-Class: myjar.injector
Agent-Class: myjar.agent
However, I get the following error when I run the jar:
com.sun.tools.attach.AgentLoadException: Agent JAR not found or no Agent-Class attribute
When I inspected the compiled jar, there was only a Main-Class attribute in the jar's manifest file. I tried recompiling outside of my IDE, but there was still only the Main-Class attribute.
Is there any way to have both Main-Class and Agent-Class in a jar file?
答案1
得分: 1
可以的。就放在那里。您有某个将Java源文件转换为JAR文件的过程。我希望它是Maven、Gradle或其他构建系统。它也可能是集成开发环境（IDE）或自己编写的脚本。这没有什么神奇的地方：您的工具链搞乱了这个。
您始终可以按以下方式检查清单：
jar xvf myjar.jar META-INF/MANIFEST.MF
cat META-INF/MANIFEST.MF
英文:
Yes. Just put it there. You have some process that turns java source files into a jar file. I would hope it is maven or gradle or some other build system. It might be an IDE or a handrolled script. There's nothing magical about it: Your tool chain is messing this up.
You can always check the manifest as follows:
jar xvf myjar.jar META-INF/MANIFEST.MF
cat META-INF/MANIFEST.MF
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