Jasperreport outputs quiet a bit of debug messages when generating print objects. To get rid of them, edit the log4j.xml file in your jboss/server/default/conf directory and add the following lines in the Limit Categories section of the file.

 <!-- Limit the net.sf.jasperreports to WARN since logging to DEBUG floods your log with unnecessary messages -->
 <category name="net.sf.jasperreports">
       <priority value="WARN"/>
 </category>