I've been stuggling myself with setting the fonts the right way, and stumbled upon the same error when trying to create a PDF files from eclipse. I ended up adding an external jar for each of the fonts (without the xml or properties files) and put the in the classpath (WEB-INF/lib) - arial.jar, timesNewRoman.jar etc. In the jrxml files each of the text elements contained the attribute pdfFontName that specified the .ttf file to be used, for example pdfFontName="arial.ttf" without a specified path. Hope that helps you or anyone else struggling to figure out the whole fonts issue (-:
