Formatted code
Fixed lock bug
Added refresh data method into getContractors()
Removed unnecessary code
Added comments
Modified booking feature.
Modified sequence of checking
Added title border
Modified warning
Added comments
Added title border
Adjusted jtable column length
Changed method from initTable() to setTable(...)
Solved update duplicate case
Removed useless code
Updated unittest
Changed start number to 1L instead 0L
Added a better handling of exception
Fixed class comment
Move DBConnecFactory from package "controller" to "db"