Fix compile error in jdk11 due to toArray confusion (#7869)

diff --git a/geode-core/src/main/java/org/apache/geode/internal/cache/EntriesSet.java b/geode-core/src/main/java/org/apache/geode/internal/cache/EntriesSet.java
index 526dd1a..3d0626a 100644
--- a/geode-core/src/main/java/org/apache/geode/internal/cache/EntriesSet.java
+++ b/geode-core/src/main/java/org/apache/geode/internal/cache/EntriesSet.java
@@ -242,7 +242,7 @@
 
   @Override
   public Object[] toArray() {
-    return toArray(null);
+    return toArray((Object[]) null);
   }
 
   @Override
diff --git a/geode-core/src/main/java/org/apache/geode/internal/cache/PartitionedRegion.java b/geode-core/src/main/java/org/apache/geode/internal/cache/PartitionedRegion.java
index e14a159..61a0aae 100755
--- a/geode-core/src/main/java/org/apache/geode/internal/cache/PartitionedRegion.java
+++ b/geode-core/src/main/java/org/apache/geode/internal/cache/PartitionedRegion.java
@@ -6213,7 +6213,7 @@
 
     @Override
     public Object[] toArray() {
-      return toArray(null);
+      return toArray((Object[]) null);
     }
 
     @Override