I am doing multiple job in multithreading, and I get this error when I try to fetch an entity from the datastore:
Object with id "com.google.appengine.api.datastore.Key:XXXXXXX(xxx)" is managed by a different Object Manager
The happen during a unit test. The problem is that I am tracking the creation of the persistence managers during the test, and I am sure that I just create only one using
JDOHelper.getPersistenceManagerFactory("transactions-optional").getPersistenceManager()
If I execute the same job using only the main thread nothing happens, everything work as expected.
I read that in order to debug this, you may call JDOHelper.getPersistenceManager(object) in order to know which persistence manager manages that object. I never get different address.
Besides, calling this method before during the fetch sometime make the call succeed without any error.