View difference between Paste ID: 7LXPSAeN and T0fGfLsY

 @Test
     public void confusedAboutJava() throws Exception {
     	assertNull(getBody(null));
     }
 
     public String getBody(DataObject dataObject) {
-        return Optional.ofNullable(dataObject).map(DataObject::getData).orElse(null);
+        return guard(dataObject, DataObject::getData);
     }
 
     private String guard(DataObject dataObject, Function<DataObject, String> getter) {
         return Optional.ofNullable(dataObject).map(getter).orElse(null);
     }
 
     static class DataObject {
         private final String data;
 
         DataObject(String data) {
             this.data = data;
         }
 
         public String getData() {
             return data;
         }
     }