I need an API java for convert a docx to pdf, I tested with XDocReport but I believe this doesn't convert the image of the head of the document.I need convert table,image and border in the pdf,the api can be paid or free. Thanks in advance.
Few years ago I have successfully used JODConverter with Open Office running in the headless mode to convert all sorts of files.
To be honest I cannot remember the exact limitations of the software, but there is a version of what I did still running as a webservice here:
http://oxgarage.oucs.ox.ac.uk:8080/ege-webclient/
and here: http://www.tei-c.org/oxgarage/.
No idea about what is the current version of the converter they are using and it is possible that it is a bit outdated and at the moment it works a lot better, but you can try to convert your files and see how well they come up before you go head first into coding.
I also found this article and it looks like it might be quite helpful for you, have a look at it:
http://angelozerr.wordpress.com/2012/12/06/how-to-convert-docxodt-to-pdfhtml-with-java/.
Oh and by the way, that webservice is opensource:
https://github.com/sebastianrahtz/oxgarage , so you can have a look at how it is implemented as well.