I get this error, too - I use JasperReports 1.3.0 and JDK 1.5_06. Unfortunately I was not able to find any solution so far (searched jasperreports-questions, jasperforge and the web), but may be my queries were not precise enough. The bug report mentioned above is not available to the public. Is the bug still open? Can anyone point me to a solution or give me hints where to start looking? What am I doing wrong? Thanks, Mike