java open source xsl-fo formatter

Hi, i use FOP 0.20.5 from the apache project as xsl-fo formatter but 
there's a lot of properties which are not supported by FOP like 
"line-stacking-strategy",
"text-indent", "white-space-treatment" or "linefeed-treatment" and it's 
really bad.
I would like to know if there is alternative solution to convert xsl-fo 
into pdf in open source java code ?
(excuse my english).