I have no idea how this doesn't seem to come up anywhere when I search, but for some reason when I try to add an item to a List<Key> that has been pulled out of the datastore I get this error:
java.lang.UnsupportedOperationException: Query result sets are not modifiable at org.datanucleus.store.query.AbstractQueryResult.add(AbstractQueryResult.java: 221) at com.appointment.actions.ContactActions.updateContactMethods(ContactActions.java: 1186) My code looks like this: public List<ContactMethod> updateContactMethods(List<ContactMethod> pPassedContactMethods,List<Key> pDatastoreContactMethodKeys) { .... PersistenceManager pm = PMF.get().getPersistenceManager(); Query query = pm.newQuery(ContactMethod.class); query.setFilter("key == :keyList"); query.execute(pDatastoreContactMethodKeys); List<ContactMethod> pDataStoreContactMethods = (List<ContactMethod>) pm.newQuery(query).execute(pDatastoreContactMethodKeys); .... for (ContactMethod lContactMethod : pPassedContactMethods) { pDataStoreContactMethods.add(lContactMethod); } pm.close(); return pDataStoreContactMethods; } The goal is that when someone adds a new ContactMethod the system picks that up and adds it to the set of Keys reference in that Person's List<Key> contactsmethods to allow the managing of an unowned relationship. Thanks ahead of time for any help! -- You received this message because you are subscribed to the Google Groups "Google App Engine for Java" group. To post to this group, send email to google-appengine-j...@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.