8309509: com/sun/jdi/RedefineNestmateAttr/TestNestmateAttr.java fails with virtual test thread factory

Reviewed-by: sspitsyn, amenkov

Author: plummercj

test/jdk/ProblemList-Virtual.txt

@@ -29,7 +29,6 @@ com/sun/jdi/EATests.java#id0                                    8264699 generic-
 
 com/sun/jdi/ExceptionEvents.java 8278470 generic-all
 com/sun/jdi/RedefineCrossStart.java 8278470 generic-all
-com/sun/jdi/RedefineNestmateAttr/TestNestmateAttr.java 8285422 generic-all
 com/sun/jdi/ReferrersTest.java 8285422 generic-all
 com/sun/jdi/SetLocalWhileThreadInNative.java 8285422 generic-all
 com/sun/jdi/StepTest.java 8285422 generic-all

test/jdk/com/sun/jdi/VMConnection.java

@@ -125,14 +125,16 @@ private Map parseConnectorArgs(Connector connector, String argString) {
 
     VMConnection(String connectSpec, int traceFlags) {
         String nameString;
-        String argString;
+        String argString = "includevirtualthreads=y";
         int index = connectSpec.indexOf(':');
         if (index == -1) {
             nameString = connectSpec;
-            argString = "";
         } else {
             nameString = connectSpec.substring(0, index);
-            argString = connectSpec.substring(index + 1);
+            // Only append args if there are actually some args after the ':'
+            if (index < connectSpec.length() - 1) {
+                argString = argString + "," + connectSpec.substring(index + 1);
+            }
         }
 
         connector = findConnector(nameString);