--- old/src/java.base/share/classes/java/util/WeakHashMap.java	2019-01-04 10:00:21.382616102 -0800
+++ new/src/java.base/share/classes/java/util/WeakHashMap.java	2019-01-04 10:00:21.062616366 -0800
@@ -211,8 +211,8 @@
         if (initialCapacity > MAXIMUM_CAPACITY)
             initialCapacity = MAXIMUM_CAPACITY;
 
-        if (loadFactor <= 0 || Float.isNaN(loadFactor))
-            throw new IllegalArgumentException("Illegal Load factor: "+
+        if (!(loadFactor > 0))          // also checks for NaNs
+            throw new IllegalArgumentException("Illegal load factor: " +
                                                loadFactor);
         int capacity = 1;
         while (capacity < initialCapacity)