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update faq.md

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hengyunabc
2022-03-02 17:41:44 +08:00
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com.sun.tools.attach.AttachNotSupportedException: Unable to open socket file: target process not responding or HotSpot VM not loaded
1. 检查当前用户和目标java进程是否一致。如果不一致，则切换到同一用户。JVM只能attach同样用户下的java 进程。
1. 检查当前用户和目标java进程是否一致。如果不一致，则切换到同一用户。JVM只能attach同样用户下的java 进程。
2. 尝试使用 `jstack -l $pid`，如果进程没有反应，则说明进程可能假死，无法响应JVM attach信号。所以同样基于attach机制的Arthas无法工作。尝试使用`jmap` heapdump后分析。
3. 尝试按[quick-start](quick-start.md)里的方式attach math-game。
3. 尝试按[quick-start](quick-start.md)里的方式attach math-game。
4. 更多情况参考： [https://github.com/alibaba/arthas/issues/347](https://github.com/alibaba/arthas/issues/347)
##### trace/watch等命令能否增强jdk里的类？