src/jdk.hotspot.agent/share/classes/sun/jvm/hotspot/gc/g1/HeapRegion.java

@@ -30,10 +30,11 @@
 import java.util.Observable;
 import java.util.Observer;
 import sun.jvm.hotspot.debugger.Address;
 import sun.jvm.hotspot.debugger.OopHandle;
 import sun.jvm.hotspot.gc.shared.CompactibleSpace;
+import sun.jvm.hotspot.gc.shared.LiveRegionsProvider;
 import sun.jvm.hotspot.memory.MemRegion;
 import sun.jvm.hotspot.runtime.VM;
 import sun.jvm.hotspot.runtime.VMObjectFactory;
 import sun.jvm.hotspot.types.AddressField;
 import sun.jvm.hotspot.types.CIntegerField;

@@ -41,11 +42,11 @@
 import sun.jvm.hotspot.types.TypeDataBase;
 
 // Mirror class for HeapRegion. Currently we don't actually include
 // any of its fields but only iterate over it.
 
-public class HeapRegion extends CompactibleSpace {
+public class HeapRegion extends CompactibleSpace implements LiveRegionsProvider {
     // static int GrainBytes;
     static private CIntegerField grainBytesField;
     static private AddressField topField;
     private static long typeFieldOffset;
     private static long pointerSize;

@@ -84,12 +85,12 @@
     public Address top() {
         return topField.getValue(addr);
     }
 
     @Override
-    public List getLiveRegions() {
-        List res = new ArrayList();
+    public List<MemRegion> getLiveRegions() {
+        List<MemRegion> res = new ArrayList<>();
         res.add(new MemRegion(bottom(), top()));
         return res;
     }
 
     @Override