code: static public int obtainNextIncrementInteger(Connection connection, ColumnData autoIncrementIntegerColumn) throws Exception {
  		try {
  			String sqlQuery = "SELECT nextval(?);";
  
  			// Create SQL command
  			PreparedStatement pstmt = null;
  			{
  				pstmt = connection.prepareStatement(sqlQuery);
  				
  				// Populate prepared statement
  				pstmt.setString(1, autoIncrementIntegerColumn.getAutoIncrementSequence());
  			}
  
  			if( pstmt.execute() ) {
  				ResultSet rs = pstmt.getResultSet();
  				if( rs.next() ) {
  					int nextValue = rs.getInt(1);
  					
  					return nextValue;
  				} else {
  					throw new Exception("Empty result returned by SQL: "+sqlQuery);
  				}
  				
  			} else {
  				throw new Exception("No result returned by SQL: "+sqlQuery);
  			}
  		} catch( Exception e ) {
  			throw new Exception("Error while attempting to get a auto increment integer value for: "+
  					autoIncrementIntegerColumn.getColumnName()+
  					" ("+autoIncrementIntegerColumn.getAutoIncrementSequence()+")",e);
  		}
  	}
docs: Performs a database query to find the next integer in the sequence reserved for
  the given column.
  @param autoIncrementIntegerColumn Column data where a new integer is required
  @return The next integer in sequence
  @throws Exception