Hello everybody !
I've got a problem, can anyone help me please ?
I have to persistent classes Parent and Child. They look like
this :
Parent {
Key key;
....
List<Child> childs ....
....
}
Child {
Key key;
....
Parent parent.....
.....
public void setParent(Parent parent){
this.parent = parent;
}
}
The code is:
.....
transaction.begin();
Parent new_parent = pm.getObjectById(new_parent_id);
child.set(new_parent);
pm.makePersistent(child);
transaction.commit();
.......
After executing that code i've got a problem:
can't operate on multiple entity groups in a single transaction.
can't operate on multiple entity groups in a single transaction. found
both Element {
[java] type: "Category"
[java] id: 2
[java] }
[java] and Element {
[java] type: "Category"
[java] id: 4
[java] }
[java] at
com.google.appengine.api.datastore.DatastoreApiHelper.translateError(DatastoreApiHelper.java:
36)
[java] at com.google.appengine.api.datastore.DatastoreApiHelper
$1.convertException(DatastoreApiHelper.java:98)
[java] at
com.google.appengine.api.utils.FutureWrapper.get(FutureWrapper.java:
69)
[java] at com.google.appengine.api.datastore.FutureHelper
$CumulativeAggregateFuture.get(FutureHelper.java:136)
[java] at com.google.appengine.api.datastore.FutureHelper
$TxnAwareFuture.get(FutureHelper.java:213)
[java] at
com.google.appengine.api.utils.FutureWrapper.get(FutureWrapper.java:
67)
[java] at
com.google.appengine.api.datastore.FutureHelper.getInternal(FutureHelper.java:
71)
[java] at
com.google.appengine.api.datastore.FutureHelper.quietGet(FutureHelper.java:
58)
[java] at
com.google.appengine.api.datastore.DatastoreServiceImpl.get(DatastoreServiceImpl.java:
55)
[java] at
org.datanucleus.store.appengine.RuntimeExceptionWrappingDatastoreService.get(RuntimeExceptionWrappingDatastoreService.java:
64)
[java] at
org.datanucleus.store.appengine.DatastorePersistenceHandler.get(DatastorePersistenceHandler.java:
96)
[java] at
org.datanucleus.store.appengine.DatastorePersistenceHandler.get(DatastorePersistenceHandler.java:
106)
[java] at
org.datanucleus.store.appengine.DatastorePersistenceHandler.fetchObject(DatastorePersistenceHandler.java:
478)
[java] at
org.datanucleus.state.JDOStateManagerImpl.validate(JDOStateManagerImpl.java:
4263)
[java] at
org.datanucleus.ObjectManagerImpl.findObject(ObjectManagerImpl.java:
2444)
[java] at
org.datanucleus.jdo.JDOPersistenceManager.getObjectById(JDOPersistenceManager.java:
1671)
[java] at
org.datanucleus.jdo.JDOPersistenceManager.getObjectById(JDOPersistenceManager.java:
1767)
[java] at
org.datanucleus.store.appengine.jdo.DatastoreJDOPersistenceManager.getObjectById(DatastoreJDOPersistenceManager.java:
73)
[java] at almatymaps.dao.CategoryDAO.getById(CategoryDAO.java:
34)
[java] at
almatymaps.servlets.UpdateMarker.doPost(UpdateMarker.java:67)
...............
Thanks.
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