Kodo says classes are not enhanced, but they are!

Hello,
I have run into a problem with Kodo and a web-app that I just can't solve.
I try to access JDO-objects from within a web-application (that uses
Struts). When I do this, I get an exception from Kodo saying the classes are
not enhanced. But I am sure they are enhanced. The exception is:
javax.jdo.JDOFatalUserException: The system could not initialize; the
following registered persistent types have not been enhanced: [class
de.mediateam.quizmaster.data.User, class
de.mediateam.quizmaster.data.Category, class
de.mediateam.quizmaster.data.Topic, class
de.mediateam.quizmaster.data.Test].
at
com.techtrader.modules.jdo.impl.jdbc.JDBCPersistenceManagerFactory.setup(JDB
CPersistenceManagerFactory.java:190)
at
com.techtrader.modules.jdo.runtime.PersistenceManagerFactoryImpl.privateSetu
p(PersistenceManagerFactoryImpl.java:496)
at
com.techtrader.modules.jdo.runtime.PersistenceManagerFactoryImpl.getPersiste
nceManager(PersistenceManagerFactoryImpl.java:61)
at
com.techtrader.modules.jdo.runtime.PersistenceManagerFactoryImpl.getPersiste
nceManager(PersistenceManagerFactoryImpl.java:50)
at
de.mediateam.quizmaster.persist.jdo.JDOFactory.getPersistenceManager(JDOFact
ory.java)
<snip>
There are two facts about this I don't understand:
1. It was working before, but then something changed (or I changed something
but I really don't remember it) and now it won't work anymore. I tried to go
back to an earlier version of my project but got the same problem.
2. It is really strange, that when I access the database from outside the
web-app (I have a small seed programm to insert some data), it works fine.
No problems.
I am sure that it is the enhanced classes loaded from within the web-app
because when I simply delete them Kodo won't find the classes at all. All
Kodo-jars are in the web-context/WEB-INF/lib directory.
Could anybody tell me the possible reasons that can cause this exception? Is
it just a test for "implements PersistenceCapable" that is done in the
setup-method, or maybe a bit more? I really can't think of anything else I
could do.
Thanks
Martin

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