How to set font size of field using iText 5

AbstractPdfFactory.java

  protected void setFirstNameField(AcroFields form) throws IOException, DocumentException {
    // Set font size.
    form.setFieldProperty("first_name", "textsize", 10f, null);
    // Set font to use.
    final BaseFont font = BaseFont.createFont(BaseFont.TIMES_ROMAN, BaseFont.CP1252, BaseFont.EMBEDDED);
    form.setFieldProperty("first_name", "textfont", font, null);
    // The font size must be set first before setting the value of the field.
    form.setField("first_name", value);
    form.setFieldProperty("first_name", "setfflags", PdfFormField.FF_READ_ONLY, null);
  }