abstract protected Serializable doWorkInCurrentTransaction(Connection conn,
    String sql) throws SQLException
The work to be done

 public Serializable doWorkInNewTransaction(SessionImplementor session) throws HibernateException 
{
		class Work implements IsolatedWork {
			Serializable generatedValue;
			public void doWork(Connection connection) throws HibernateException {
				String sql = null;
				try {
					generatedValue = doWorkInCurrentTransaction( connection, sql );
				}
				catch( SQLException sqle ) {
					throw JDBCExceptionHelper.convert(
							session.getFactory().getSQLExceptionConverter(),
							sqle,
							"could not get or update next value",
							sql
						);
				}
			}
		}
		Work work = new Work();
		Isolater.doIsolatedWork( work, session );
		return work.generatedValue;
}

Suspend the current transaction and perform work in a new transaction