How to handle connection to db problems using toplink

Question

Hi,
We need to handle loss of db connection in our application. We use glassfish and toplink essentials (0.22). I suspect that a java RuntimeException is thrown by toplink. This is the code we use to access the db (mysql). The MyServiceImpl class is where I have my EntityManager to access my persistence entities. Is this the place to catch the RuntimeException? How can I handle it. Is it a reconnect I shall add to the code?
//mike
@Stateless
public class MyServiceImpl implements MyService {
private Logger log = Logger.getLogger(this.getClass().getName());
@PersistenceContext(unitName = "myservice")
private EntityManager manager;
* For unit test, not exposed as a remote method
* @param entitymanager
* to use instead of default JTA manager
public void changeEntityManager(EntityManager em) {
log.finest("Changing entitymanager for unit test outside EJB container");
this.manager = em;
@TransactionAttribute(TransactionAttributeType.SUPPORTS)
public User loginUser(String address, String password) throws LoginFailedException {
log.finest("Login user " + address);
return new UserDao(manager).loginUser(address, password);
@TransactionAttribute(TransactionAttributeType.SUPPORTS)
public String getSystemSetting(Setting setting) throws SettingNotFoundException {
return new SettingDao(manager).getSystemSetting(setting).getValue();
}

Answer 1

I forgot to provide the code we are using to connect.
@Stateless
public class MyServiceImpl implements MyService {
private Logger log = Logger.getLogger(this.getClass().getName());
@PersistenceContext(unitName = "myservice")
private EntityManager manager;
* For unit test, not exposed as a remote method
* @param entitymanager
* to use instead of default JTA manager
public void changeEntityManager(EntityManager em) {
log.finest("Changing entitymanager for unit test outside EJB container");
this.manager = em;
@TransactionAttribute(TransactionAttributeType.SUPPORTS)
public User loginUser(String address, String password) throws LoginFailedException {
log.finest("Login user " + address);
return new UserDao(manager).loginUser(address, password);
@TransactionAttribute(TransactionAttributeType.SUPPORTS)
public String getSystemSetting(Setting setting) throws SettingNotFoundException {
return new SettingDao(manager).getSystemSetting(setting).getValue();
}