--- old/src/java.base/share/classes/java/lang/AbstractStringBuilder.java	2019-04-18 12:07:36.000000000 -0700
+++ new/src/java.base/share/classes/java/lang/AbstractStringBuilder.java	2019-04-18 12:07:35.000000000 -0700
@@ -25,7 +25,10 @@
 
 package java.lang;
 
-import jdk.internal.math.FloatingDecimal;
+import jdk.internal.math.DoubleToDecimal;
+import jdk.internal.math.FloatToDecimal;
+
+import java.io.IOException;
 import java.util.Arrays;
 import java.util.Spliterator;
 import java.util.stream.IntStream;
@@ -874,7 +877,11 @@
      * @return  a reference to this object.
      */
     public AbstractStringBuilder append(float f) {
-        FloatingDecimal.appendTo(f,this);
+        try {
+            FloatToDecimal.appendTo(f, this);
+        } catch (IOException ignored) {
+            assert false;
+        }
         return this;
     }
 
@@ -891,7 +898,11 @@
      * @return  a reference to this object.
      */
     public AbstractStringBuilder append(double d) {
-        FloatingDecimal.appendTo(d,this);
+        try {
+            DoubleToDecimal.appendTo(d, this);
+        } catch (IOException ignored) {
+            assert false;
+        }
         return this;
     }