Lazy instantiation problem

Question

I would like to instantiate collections only when they are needed. It
works fine for non transactional instances but fails when my instance is
transactional with following error:
To perform writes on persistent data outside of a transaction,
the "nontransactionalWrite" property must be set on the
PersistenceManagerFactory or Transaction.
Collection getChildNodesCollection() {
if (childNodes == null) {
childNodes = new ArrayList();
return childNodes;
I guess it is to be expected as JDO have to enhance all assignments to
childNodes collection but is there any way to avoid it. If not I will
have to go back to constructor based initialization which is a waste of
resources because when JDO creates an instance it will replace all
collection I create with its own

Answer 1

Hi,
Sorry, this is not an answer for your question.
I'm a beginner on Kodo, and I wonder how did you do the "lazy instantiation"
of
members of a collection. Can you specify any documents written about it?
Thank you,
Tomohiro Koike
""Roytman, Alex"" <[email protected]> wrote in message
news:[email protected]..
I would like to instantiate collections only when they are needed. It
works fine for non transactional instances but fails when my instance is
transactional with following error:
To perform writes on persistent data outside of a transaction,
the "nontransactionalWrite" property must be set on the
PersistenceManagerFactory or Transaction.
Collection getChildNodesCollection() {
if (childNodes == null) {
childNodes = new ArrayList();
return childNodes;
I guess it is to be expected as JDO have to enhance all assignments to
childNodes collection but is there any way to avoid it. If not I will
have to go back to constructor based initialization which is a waste of
resources because when JDO creates an instance it will replace all
collection I create with its own