public ConnectionManager(ConnectionManagerConfiguration configuration) throws Exception {
  _configuration=configuration;
  if (_configuration == null) {
    throw new ConnectionManagerException("Invalid null connection manager configuration.");
  }
}

public ConnectionManager ( ConnectionManagerConfiguration configuration ) throws Exception { _configuration = configuration ; if ( _configuration == null ) { throw new ConnectionManagerException ( "Invalid null connection manager configuration." ) ; } }
constructs a connection manager instance .
