src/jdk.scripting.nashorn/share/classes/jdk/nashorn/internal/runtime/arrays/ByteBufferArrayData.java

@@ -80,11 +80,11 @@
     public void setLength(final long length) {
         throw new UnsupportedOperationException("setLength");
     }
 
     @Override
-    public void shiftLeft(final int by) {
+    public ArrayData shiftLeft(final int by) {
         throw unsupported("shiftLeft");
     }
 
     @Override
     public ArrayData shiftRight(final int by) {