I get AttachNotSupportedException while running jmockit tests on linux (ubuntu 64bit). Java version is 1.7.0_51. This JDK is from Oracle. Tests are run using ant(that probably is not relevant)
See the stack trace.
[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
It appears to be related to AttachNotSupportedException while running jMockit tests on IBM JRE. This however is on IBM jre.
Work around for now.
Adding '-XX:+StartAttachListener' to jvm argument fixed the issue.
A similar issue is discussed here at https://code.google.com/p/jmockit/issues/detail?id=136 and http://mail.openjdk.java.net/pipermail/macosx-port-dev/2013-October/006098.html (which talks about a possible regression in jdk7 build)