All DB connection errors should raise a SOSHibernateInvalidSessionException

Current Situation
When an DB connection error occurs while a query is processed it sometimes results in a SOSHibernateQueryException.
When an DB connection error occurs while a transaction is opened it sometimes results in a SOSHibernateTransactionException.

Desired Behavior
All DB connection errors which are based on a nested Exception of the type org.hibernate.exception.JDBCConnectionException should result in a SOSHibernateInvalidSessionException being raised.