Thought I'd blog this quickly:
If you're using iReport to develop reports for use with the Jasper Reports grails plugin, make sure you download the version that matches the version of Jasper that the plugin uses (currently 2.0.5). Otherwise you get terribly unhelpful exceptions like:
java.lang.NullPointerException at net.sf.jasperreports.engine.JRPropertiesMap.readObject(JRPropertiesMap.java:185)
Comments
http://ironicprogrammer.blogspot.com/2009/09/creating-jasper-reports-in-grails.html