JPAContainer - add item causes StaleStateException

I have a table which uses a JPAContainer as a data source. I have an 'Add Record' button which creates a new entity and adds it to the container/database. This works one time, but the second time I try to add a record, I get the following error:

org.hibernate.StaleStateException: Batch update returned unexpected row cound from update [0]; actual row count: 0; expected: 1

Followed by a very long stack traceback...

My code in the Button for adding the record looks like this (I've removed all the error checking and validation code to simplify the presentation...):

b_AddFilter.addListener(new Button.ClickListener() {
			private static final long serialVersionUID = 1L;

			@Override
			public void buttonClick(ClickEvent event) {
				JartFilter jf = null;
				
.... validate inputs...
						jf = new JartFilter();
						jf.setUser(u);
						jf.setFilterName(fName);
						jf.setRegex(regex);

						try{
							jc_JartFilters.addEntity(jf);
						}
						catch(Exception e){
							Logger.error("Failed to add Filter: " + jf.getFilterName());
							Logger.error("Exception: " + e);
							e.printStackTrace();
						}
					}
				}
				
				tbl_JartFilter.select(null);
			}
		});

The JPAContainer is defined as: JPAContainer<JartFilter> jc_JartFilters
and the table uses jc_JartFilters as its source.

Can someone point out what I'm doing wrong with respect to my database access? I also have an update and a delete button on this page. The update routine takes an existing
record and calls jc_JartFilters.addEntity(jf). This can be called repeatedly and it seems to correctly update the selected record. Delete also seems to work, but a
call to addRecord after a delete fails with the same StaleStateException. The delete is handled by calling jc_JartFilters.removeItem(oid) where oid is the table.getValue() (selected row id).

Side Question - why is there an addEntity() but not a removeEntity() or updateEntity() routine? Am I missing something?

thanks,

nbc

In another thread, I was asking about the various persistence libraries I should be using. I have since replaced the somewhat random collection of Hibernate libraries I was working with with the EclipseLink libraries, and then upgraded to the latest JPAContainer and the StaleStateException seems to have disappeared - for now, at least. I'm guessing I had inconsistent versions of the various jar files.

nbc