Hi, I have a functioning app and recently have had intermittent problems writing to the datastore. I did not make any relevant code changes, however in the last few days my attempts to write to the datastore sometimes work and sometimes don't.

I am trying to save an object that is in a many to one relationship with an existing persisted parent. So, the logic works like this:

1) Parent pulled from the datastore 2) Child created / instantiated using constructor 3) Parent.addSingleChild(child); // the "addSingleChild" method just adds the object argument to the collection of children 4) child.setParent(Parent); // sets the Parent object to the parent field

I am using transactions as explained in the documentation ending with "finally {if (tx.isActive()) {tx.rollback(); } }"

When the servlet is called, the parent is called from the datastore and the child object is created and added to the many to one mapping to the pre-existing parent.

The child should automatically be persisted, since the parent is already persistent, and the child is added to the collection of children that map to the parent. And it worked this way in the past. However, to be sure, i did add a pm.makePersistent(child). Doesn't seem to help, still have the intermittent problem.

Any suggestions would be appreciated, and if you need to see the actual code I can post. Thanks