I use iReport 5.5.0.
When I design report, I click on text field and chose its border and padding with double line line style. But when I run it within iReport preview or deploy it to Jasperreports server, there is no double line output and it is replace with single line style.
Could anybody tell me the reason why?
Difficult to understand what you want to do. In your original post, you mentioned Text field but you're now talking about cross-tabs whch is a different component. Nevertheless, I can only say that the borders of a crosstab in attached report look double line to me.
I've tested if I can put a text element with double line in a cross tab. I have to say there's no problem (see attached).
If you can't do it yourself, should get some professional support or assistance.