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[protege-discussion] Java.lang.ClassCastException

Csongor Nyulas csongor.nyulas at
Sat Mar 7 14:02:13 PST 2009

Hi Florencia,

Did you put the necessary jar files in your plugin folder? If yes (and 
this is recommended), then you have to remove those and any other jar 
files containing conflicting classes from your system CLASSPATH, because 
Protege will add all the jar files residing in all the Protege plugin 
directories to its CLASSPATH.
Also it would help if you could tell us which Protege are you using, 
respectively if you use the same Protege version in eclipse as the one 
you are trying to test on.

I hope this helps,
florencia liggerini wrote:
> Hi,
> I´m developing a createProject plugin in eclipse using a Object Oriented
> DataBase(db4o 6.4).When I run the application from eclipse it works 
> well. But
> when I create the jar and put into the plugins folder it throws the 
> following error:
> Java.lang.ClassCastException: com.db4o.reflect.generic.genericObject 
> cannot be
> cast to com.db4o.ext.Db4oDatabase.
> I can´t find out which is the problem.
> Thanks a lot!
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