We run now and then into these errors when running jdk/jshell/CompletionSuggestionTest.java :

config CompletionSuggestionTest.setUp(): success
test CompletionSuggestionTest.testIntersection(): success
config KullaTesting.tearDown(): success
config CompletionSuggestionTest.setUp(): failure
java.lang.IllegalStateException: Launching JShell execution engine threw: FailOverExecutionControlProvider: FAILED: 0:jdi:hostname(127.0.0.1) --
  Exception: java.lang.InternalError: Failed remote listen: java.util.concurrent.ExecutionException: com.sun.jdi.connect.TransportTimeoutException: timeout waiting for connection @ com.sun.jdi.SocketListen (defaults: timeout=, port=, localAddress=) -- {timeout=timeout=5000, port=port=xyz, localAddress=localAddress=127.0.0.1}
                  jdk.jshell/jdk.jshell.execution.JdiInitiator.reportLaunchFail(JdiInitiator.java:300)
                  jdk.jshell/jdk.jshell.execution.JdiInitiator.listenTarget(JdiInitiator.java:199)
                  jdk.jshell/jdk.jshell.execution.JdiInitiator.<init>(JdiInitiator.java:111)
                  jdk.jshell/jdk.jshell.execution.JdiDefaultExecutionControl.create(JdiDefaultExecutionControl.java:103)
                  jdk.jshell/jdk.jshell.execution.JdiExecutionControlProvider.generate(JdiExecutionControlProvider.java:152)

Mostly the error is observed on Windows , but sometimes as well on other platforms (e.g. macOS).
Should we maybe mark the test "intermittent" ?