code: protected void setArraySeparator(String arraySeparator) {
          if (arraySeparator == null) {
              arraySeparator = StringUtils.EMPTY;
          }
          this.arraySeparator = arraySeparator;
      }
docs: <p>Sets the array separator text.</p>
  
  <p><code>null</code> is accepted, but will be converted to
  an empty String.</p>
  
  @param arraySeparator  the new array separator text