Detecting database connection lost

[Guillaume CHAUVET]

Hi OpenJPA Users,

We need to detect a connection lost between Derby (in server mode) and our 
swing client that uses OpenJPA 2.x.
Our goal is to provide a more user friendly message (with ping button, a 
troubleshooting procedure and more).

Right now, we use the below pattern to detect some connection lost, but some of 
them were not catched :
=============
Thread.setDefaultUncaughtExceptionHandler(new Thread.UncaughtExceptionHandler() 
{
            @Override
            public void uncaughtException(Thread thread, Throwable thrwbl) {
                for (Throwable cause = thrwbl.getCause(); cause != null; cause 
= cause.getCause()) {
                    if (cause instanceof DisconnectException) {
                        fireDisconnected();
                        break;
                    }
                }
            }
        });
========

I discussed on the Derby User ML that replied me I should use a < 
ClientConnectionPoolDataSource > and register a ConnectionEventListener that 
will be notified if the connection to the server is lost.

So, I configured the DS (without errors at runtime) and I added a listener like 
this :
========
DecoratingDataSource dds = (DecoratingDataSource) ((OpenJPAConfiguration) 
emf.getConfiguration()).getConnectionFactory();
            ClientConnectionPoolDataSource ds = 
(ClientConnectionPoolDataSource) dds.getDelegate();
            ds.getPooledConnection().addConnectionEventListener(new 
ConnectionEventListener() {
                @Override
                public void connectionClosed(ConnectionEvent ce) {
                }

                @Override
                public void connectionErrorOccurred(ConnectionEvent ce) {
                    fireDisconnected(); // <===== expected call
                }
            });
========

But the listener is never called...
Would I forget something ? (surely !)

Regards,
Guillaume