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`IndyBootstrapDispatcher` cannot be properly loaded in the Resin environment

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评估

难度
4/5
预计耗时
3-5 天
新手友好度
38/100
Issue 类型
缺陷
描述清晰度
基本清楚
活跃度
停滞
技术栈
java
领域
observability

调研方向

首先,使用 $RESIN_HOME/bin/httpd.sh、resin.conf 中的 JVM 参数以及 vulns.war 设置重现失败。阅读 resin.jar 中的 com.caucho.boot.WatchdogProcess#createProcess 和 Resin 3 的 tree-node 类加载路径,然后将其预期的 java/lang/IndyBootstrapDispatcher.class 条目与 shaded agent 路径进行比较。完成的标准是 Resin 能够加载该类,并且 agent 功能正常工作。

由索引模型根据 Issue 内容生成。

描述

agent-java community

Describe the bug

When starting Resin 3 using the provided startup script ($RESIN_HOME/bin/httpd.sh), the runtime is unable to load java.lang.IndyBootstrapDispatcher via the DynamicClassLoader.

After some investigation, I found that the startup script ultimately calls the com.caucho.boot.WatchdogProcess#createProcess method (located in resin.jar) to launch Resin. This method hardcodes the startup argument -Djava.system.class.loader=com.caucho.loader.SystemClassLoader, which replaces the default system class loader.

As a result, when Resin tries to load IndyBootstrapDispatcher, the DynamicClassLoader delegates the loading to SystemClassLoader, which is unable to load it. In Resin 3, the resin.conf file provides a tree-node element to configure special JAR file paths, allowing SystemClassLoader to access the target files. However, the internal implementation is hardcoded to fetch the target entry from the JAR file, like configuredJars.getJarEntry("java/lang/IndyBootstrapDispatcher.class").

The issue is that Elastic has shaded the class, and its actual resource path is represented as agent/bootstrap/java/lang/IndyBootstrapDispatcher.esclazz. This mismatch causes the class loading to fail, leading to malfunctioning agent functionality.

All the above is specific to Resin 3. Resin 4 might have the same problem, but I haven't tested it yet.

Steps to reproduce

  1. In the resin.conf file, add the following configuration
<jvm-arg>-javaagent:/path/to/elastic-apm-agent.jar</jvm-arg>
<jvm-arg>-Delastic.apm.log_level=DEBUG</jvm-arg>
<jvm-arg>-Delastic.apm.log_file=/path/to/logs/elastic-apm-agent.log</jvm-arg>
  1. download the vulns.jar to $RESIN_HOME/webapps
  2. RUN $RESIN_HOME/bin/httpd.sh start
  3. Access http://localhost:7040/vulns through your browser
主要语言
Java
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环境准备

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  3. Fork 仓库,在一个分支上完成修改。
  4. 提交 Pull Request,并在描述里引用这个 Issue 编号。

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