Jasper report 有個問題, 當summary 部分無法放在最后一頁時, 會自己到新的頁, 問題是這個新的頁是沒有頁眉和頁腳,
Jasper 的官方解釋是 "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"

所以如果要解決這個問題, 他們提供的方法是創建 The fake summary,  也就是用一個Dummy Group 的 footer 替帶 summary, 那個Dummy Group 的 group expression 是 empty