Thanks for your hint. Meanwhile I debugged the code and found the reason of
the NullPointerException.
The method getObjectById is implemented by the class
DatastoreJDOPersistenceManager. Within this method there is
*EntityUtils.idToInternalKey(getObjectManager(),
cls, key, false);*. This methods ends (obviously) in the class EntityUtils.
Within this class and method you call *determineKind(cmd, om);*. But the
parameter cmd is alrady null. A few methods later there is the follwoing
line: *if (acmd.getTable() != null) {...}* et voila -> NullPointerException.
The reason why acmd is null is because of this line within the EntityUtils
class (method idToInternalKey):
*AbstractClassMetaData cmd =
om.getMetaDataManager().getMetaDataForClass(cls,
om.getClassLoaderResolver());*
Within the method getMetaDataForClass there is the following check:
*if (isClassWithoutPersistenceInfo(c.getName())){ return null;}*
So, does anybody know what this means?
Yes - my entity class does not have any annotation but I thought this isn't
necessary at all?! Should I have to include such kind of informations to my
class?
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