Jasper report 有个问题, 当summary 部分无法放在最后一页时, 会自己到新的页, 问题是这个新的页是没有页眉和页脚,
Jasper 的官方解释是 "The title and the summary are special report sections that are not accompanied by the page header and footer on the pages that they occupy. This is more obvious when the title or the summary overflows"

所以如果要解决这个问题, 他们提供的方法是创建 The fake summary,  也就是用一个Dummy Group 的 footer 替带 summary, 那个Dummy Group 的 group expression 是 empty