I've got a radio group that's tied to a propertymodel which is set to '0' by default:
RadioGroup monthlyRadioGroup = new RadioGroup("eventSchedule.intervalOfMonth"); When saving my form I get this error: org.apache.wicket.util.convert.ConversionException: Can't convert null value to a primitive class: int for setting it on [EMAIL PROTECTED]<null>] at org.apache.wicket.util.lang.PropertyResolver$MethodGetAndSet.setValue(Pr opertyResolver.java:1079) I can see the value of intervalOfMonth being '0' in the setter/getter. When I set the value to anything else but '0' it doesn't throw this. I'm must be missing something here, but '0' should be allowed, correct? Michael