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I dont know how to reproduce it so I decide to take a photos/screenshot. You can find it here: http://img224.imageshack.us/my.php?image=reflectionexception7fb.png How I made it happen: I tried to follow a JDO2 tutorial in devWork (IBM web site) and succeeded in making it work: compile the POJO class, enhancing the POJO to make it persistable and run it. A day after that, I came back by opening Netbeans, browsed to that that JDO project, pointed to MyApplication (the class has a main() method) has found out that there was a strange behaviour. My screenshots told it. You could see that some strange information displayed in the left panel: Navigation (class browser): Invalid object. I am really sorry that I can not guess or reproduce that once more after several tries. Thanks
Created attachment 30570 [details] Netbeans log file
Reassigning to "mdr" for evaluation.
I am closing all reports in category Java/Unsupported as wontfix. These should be dead issues --- if the reported cases are against some live part of the NetBeans IDE please reopen and we can discuss to which category they belong.