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

Question

我AttachNotSupportedException 在linux(ubuntu 64bit)上运行jmockit测试时得到的.Java版本是1.7.0_51.这个JDK来自Oracle.使用ant运行测试(可能不相关)

查看堆栈跟踪.

[junit] 
[junit] java.lang.RuntimeException: com.sun.tools.attach.AttachNotSupportedException: Unable to open socket file: target process not responding or HotSpot VM not loaded
[junit]     at mockit.internal.startup.JDK6AgentLoader.getVirtualMachineImplementationFromEmbeddedOnes(JDK6AgentLoader.java:89)
[junit]     at mockit.internal.startup.JDK6AgentLoader.loadAgent(JDK6AgentLoader.java:54)
[junit]     at mockit.internal.startup.AgentInitialization.initializeAccordingToJDKVersion(AgentInitialization.java:21)
[junit]     at mockit.internal.startup.Startup.initializeIfNeeded(Startup.java:136)
[junit]     at mockit.internal.startup.Startup.initializeIfPossible(Startup.java:169)
[junit]     at junit.framework.TestResult.<clinit>(TestResult.java:15)
[junit]     at org.apache.tools.ant.taskdefs.optional.junit.JUnitTestRunner.run(JUnitTestRunner.java:356)
[junit]     at org.apache.tools.ant.taskdefs.optional.junit.JUnitTestRunner.launch(JUnitTestRunner.java:1165)
[junit]     at org.apache.tools.ant.taskdefs.optional.junit.JUnitTestRunner.main(JUnitTestRunner.java:1016)
[junit] Caused by: com.sun.tools.attach.AttachNotSupportedException: Unable to open socket file: target process not responding or HotSpot VM not loaded
[junit]     at sun.tools.attach.LinuxVirtualMachine.<init>(LinuxVirtualMachine.java:106)
[junit]     at mockit.internal.startup.JDK6AgentLoader.getVirtualMachineImplementationFromEmbeddedOnes(JDK6AgentLoader.java:79)
[junit]     ... 8 more
[junit] Exception in thread "main" java.lang.ExceptionInInitializerError
[junit]     at org.apache.tools.ant.taskdefs.optional.junit.JUnitTestRunner.run(JUnitTestRunner.java:356)
[junit]     at org.apache.tools.ant.taskdefs.optional.junit.JUnitTestRunner.launch(JUnitTestRunner.java:1165)
[junit]     at org.apache.tools.ant.taskdefs.optional.junit.JUnitTestRunner.main(JUnitTestRunner.java:1016)
[junit] Caused by: java.lang.RuntimeException: com.sun.tools.attach.AttachNotSupportedException: Unable to open socket file: target process not responding or HotSpot VM not loaded
[junit]     at mockit.internal.startup.JDK6AgentLoader.getVirtualMachineImplementationFromEmbeddedOnes(JDK6AgentLoader.java:89)
[junit]     at mockit.internal.startup.JDK6AgentLoader.loadAgent(JDK6AgentLoader.java:54)
[junit]     at mockit.internal.startup.AgentInitialization.initializeAccordingToJDKVersion(AgentInitialization.java:21)
[junit]     at mockit.internal.startup.Startup.initializeIfNeeded(Startup.java:136)
[junit]     at mockit.internal.startup.Startup.initializeIfPossible(Startup.java:169)
[junit]     at junit.framework.TestResult.<clinit>(TestResult.java:15)
[junit]     ... 3 more
[junit] Caused by: com.sun.tools.attach.AttachNotSupportedException: Unable to open socket file: target process not responding or HotSpot VM not loaded
[junit]     at sun.tools.attach.LinuxVirtualMachine.<init>(LinuxVirtualMachine.java:106)
[junit]     at mockit.internal.startup.JDK6AgentLoader.getVirtualMachineImplementationFromEmbeddedOnes(JDK6AgentLoader.java:79)
[junit]     ... 8 more
[junit] Running chs.caf.cap

在IBM JRE上运行jMockit测试时,它似乎与AttachNotSupportedException有关.但这是在IBM jre上.

Answer 1

现在就来解决.

添加'-XX:+StartAttachListener'到jvm参数修复了该问题.

https://code.google.com/p/jmockit/issues/detail?id=136和http://mail.openjdk.java.net/pipermail/macosx-port-dev/2013上讨论了类似的问题-October/006098.html (谈到jdk7构建中可能的回归)

Answer 2

我的回答有点无关,但在尝试使用转储线程时遇到了同样的问题jcmd.即使我jcmd在root用户下运行,我也得到相同的错误消息.

您需要jcmd <pid> Thread.dump在与java进程相同的用户下运行,否则您的连接将被删除.如果你是root用户, Java并不在意.

所以基本上:

sudo -u <java_process_user> jcmd <pid> Thread.dump

Answer 3

和 @bbarker 一样，我也遇到了同样的错误，但在 JDK 1.8.0_161 上使用 Windows 10 中的 Linux 子系统（“Bash on Ubuntu on Windows”）。使用上面提到的 JVM 参数配置 Surefire 插件也解决了我的问题：

    <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-surefire-plugin</artifactId>
        <version>2.21.0</version>
        <configuration>
            <argLine>-XX:+StartAttachListener</argLine>
        </configuration>
    </plugin>

不过，如果没有上述内容，从“正常”Windows 命令提示符运行测试也可以。