Java-AttachNotSupportedException:无法打开套接字文件:未加载HotSpot VM [英] Java - AttachNotSupportedException: Unable to open socket file: HotSpot VM not loaded

问题描述

当尝试将代理jar文件附加到在Java中运行的另一个进程时，遇到了例外情况:

When attempting to attach an agent jar file onto another process running in java, I have came across the exception:

com.sun.tools.attach.AttachNotSupportedException: 无法打开套接字文件:目标进程未响应或未加载HotSpot VM

我当时正在使用Java Oracle JDK 8_101 运行linux，但是在回答了这个问题之后，我意识到操作系统对于这个问题的产生无关紧要.

I was running linux, with java Oracle JDK 8_101, however after answering this question I've realized the O.S does not matter for the cause of this problem.

答案:

Answer:

如果遇到此问题，发生在我这里的原因是因为我是从另一个JVM启动程序的，而不是为系统指定的默认JVM.

If you encounter this problem, the reason it occured for me is because I was launching a program from a different JVM, other than the default JVM specified for the system.

即)

程序 A (启动器) 在上运行> JVM-1 (例如，JDK_8_1或JDK_8_1/jdk/jre).

程序 A (启动器) ，使用 java -jar programB.jar

Program A (The launcher), creates a process with java -jar programB.jar

程序 B (目标) ，正在系统的默认的JVM， JVM-2 (例如，JDK_8_2或JDK_8_2/jre).

程序 A (启动器) 不能参加程序 B (目标) ，因为JVM 程序 A (启动器) 正在运行，但与程序 B (目标) 正在运行，因此抛出了 com.sun.tools.attach.AttachNotSupportedException:

Program A (The launcher) CANNOT attatch to Program B (The target), because the JVM Program A (The launcher) is running on, does not match the JVM of which Program B (The target) is running on, thus throwing the com.sun.tools.attach.AttachNotSupportedException:

推荐答案

此问题的常见原因:

• 附加套接字/tmp/.java_pid1234 已删除(例如，通过定期清理/tmp的计划作业).
• 目标JVM使用 -XX:+ DisableAttachMechanism 选项启动.
• 正在进行垃圾回收或其他长时间的VM操作(例如，堆转储).
• JVM无法在附加超时内达到安全点.这种情况很少发生，并且该问题通常是间歇性的.

• Attach socket /tmp/.java_pid1234 has been removed (e.g. by a scheduled job that periodically cleans up /tmp).
• Target JVM is started with -XX:+DisableAttachMechanism option.
• Garbage Collection or other long VM operation (e.g. Heap Dump) is in progress.
• JVM cannot reach safepoint within attach timeout. This happens rarely, and the problem is typically intermittent.

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