I'm using google app engine and its datastore to store a JDO Entity, called A. Class A has a @Persistent member of type B. I'm making changes to A, everything works fine... except this B member is never recorded in the datastore (I don't think). Changes to B don't show up, every fetch I do has B has null even though I clearly set it to an instance of B before I makePersistent(theAInstance).
No errors are displayed anywhere. It just doesn't work. Is there any way to get a look at what is happening in dev mode, or enable some more verbose level of logging? I've been digging at this for an hour and it's driving me insane.