[英]Load a Java agent JAR located inside the loader
I have two separate projects in my IDE for the agent and for the loader that finds a target VM and loads the agent JAR.我的 IDE 中有两个单独的项目,用于代理和用于查找目标 VM 并加载代理 JAR 的加载程序。
agent.jar
in it.agent.jar
。 The resulting runnable loader structure looks like this:生成的可运行加载程序结构如下所示:
loader.jar
├── META-INF
│ └── MANIFEST.MF
├── me.domain.loader
│ └── Main.class
└── agent.jar
├── META-INF
│ └── MANIFEST.MF
└── me.domain.agent
└── Agent.class
From the VirtualMachine#loadAgent(java.lang.String) specification, I need to provide a path to the JAR containing the agent as the first parameter.根据VirtualMachine#loadAgent(java.lang.String)规范,我需要提供包含代理的 JAR 的路径作为第一个参数。
However, when using Main.class.getResource("/agent.jar").getPath()
I'm getting an AgentLoadException: Agent JAR not found or no Agent-Class attribute
.但是,当使用
Main.class.getResource("/agent.jar").getPath()
我得到一个AgentLoadException: Agent JAR not found or no Agent-Class attribute
。 What's the correct way to do that?正确的做法是什么?
I already had such issue on a maven project.我已经在 maven 项目中遇到过这样的问题。 Anyway you may need to have a manifest file here in META-INF/MANIFEST.MF:
不管怎样,你可能需要在 META-INF/MANIFEST.MF 中有一个清单文件:
Manifest-Version: 1.0
Agent-Class: com.package.AgentLoader.agentNameHere
Permissions: all-permissions
You have more details here: https://docs.oracle.com/javase/tutorial/deployment/jar/manifestindex.html or Agent JAR not found or no Agent-Class attribute您在此处有更多详细信息: https://docs.oracle.com/javase/tutorial/deployment/jar/manifestindex.html或找不到代理 JAR 或没有代理类属性
It looks like the agent JAR to be loaded must exist on disk.看起来要加载的代理 JAR 必须存在于磁盘上。 I've solved this issue by copying the embedded JAR resource into a temporary file:
我通过将嵌入的 JAR 资源复制到一个临时文件中解决了这个问题:
private static String getTemporaryResource(String resourceName) {
// Read embedded resource from this JAR
InputStream resourceStream = Main.class.getResourceAsStream(resourceName);
if (resourceStream == null) {
throw new Exception("Resource not found in the JAR");
}
// Create a temporary file in %TEMP%/resource5513111026806316867.tmp
File temporaryFile = File.createTempFile("resource", null);
temporaryFile.deleteOnExit();
// Copy the resource data into the temporary file
Files.copy(resourceStream, temporaryFile.toPath(), StandardCopyOption.REPLACE_EXISTING);
// Return the path to temporary file
return temporaryFile.getAbsolutePath();
}
I'm then using this temporary path to load the agent:然后我使用这个临时路径来加载代理:
String tempAgentPath = getTemporaryResource("/agent.jar");
VirtualMachine targetVM = VirtualMachine.attach("1337");
targetVM.loadAgent(tempAgentPath);
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