AttachNotSupportedException: Unable to enqueue operation: the target VM does not support attach mechanism

Following exception occurs in Windows for IBM JDK 6 while executing a JUnit testcase which uses JMockit framework, in-spite of enabling the Attach API "-Dcom.ibm.tools.attach.enable=yes" - java.lang.RuntimeException: com.sun.tools.attach.AttachNotSupportedException: Unable to enqueue operation: the target VM does not support attach