docs: @Override
      public void sync() {
          Entry e = container.getEntry(inputSource.getRelativeURL());
          if (e!=null) {
              sourceFileTimestamp = e.getLastModified();
          }
          ResourceUtil.sync(sourceFileTimestamp, generatedSourceFile, classFile, className, keepgenerated, keepGeneratedclassfiles);
          //sourceFileTimestamp = sourceFile.lastModified();
      }