Can I define a read-only transaction using GAE's JDO?

Question

I'm use the latest versions of the GWT GAE w/ JDO stack. I have a task queue updating persistent objects with the datastore. I also have a gwt user interface displaying the save objects (without modification).

Given tightly defined transaction (start/commit) boundaries. Is there a way for me to define a read-only transaction for the GUI that does not conflict with the task updating the objects?

I believe they are conflicting and throwing these exceptions (abridged)

javax.jdo.JDODataStoreException: Transaction rolled back due to failure during commit

at org.datanucleus.jdo.NucleusJDOHelper.getJDOExceptionForNucleusException(NucleusJDOHelper.java:402) at org.datanucleus.jdo.JDOTransaction.commit(JDOTransaction.java:132) .... NestedThrowablesStackTrace: java.sql.SQLException: Concurrent Modification at org.datanucleus.store.appengine.DatastoreTransaction.commit(DatastoreTransaction.java:70)