test/hotspot/jtreg/vmTestbase/nsk/jdi/ReferenceType/instances/instances003/instances003.java

*** 39,48 ****
--- 39,49 ----
   *                 - initiate GarbageCollection in Debuggee VM
   *                 - check the number of instances is 0
   *         done
   *         Test is executed for following sublcasses of ObjectReference: StringReference, ThreadReference, ClassLoaderReference
   *
+  * @requires vm.gc != "Z"
   * @library /vmTestbase
   *          /test/lib
   * @run driver jdk.test.lib.FileInstaller . .
   * @build nsk.jdi.ReferenceType.instances.instances003.instances003
   * @run main/othervm/native PropertyResolvingWrapper
*** 123,132 ****
--- 124,138 ----
          // during the time between creating them and disabling collection on them
          pipe.println(HeapwalkingDebuggee.COMMAND_CREATE_INSTANCES + ":" + className + ":" + createInstanceCount +
              ":" + referrerCount + ":" + referrerType +
              (referrerType.equals(ObjectInstancesManager.WEAK_REFERENCE) ? "|" + ObjectInstancesManager.STRONG_REFERENCE : ""));
  
+         // Note!
+         // Test broken - assumes that no GC is run before heap walk.
+         // G1 fails, just like ZGC, if en explicitly GC is done here.
+         // forceGC();
+ 
          // the instance counts should not be affected by creating multiple references
          checkDebugeeAnswer_instanceCounts(className, createInstanceCount, objectsToFilter);
  
          ReferenceType referenceType = debuggee.classByName(className);
          List<ObjectReference> instances = HeapwalkingDebugger.filterObjectReferrence(objectsToFilter, referenceType.instances(0));