Using getDBConnection rather than pass connection as a parameter.
Using getDBConnection method rather than a parameter.
Change the prototype of method getUniqeID
Add DBConnectionPool object in servlet's init method and DBConnectionPool's release method in servlet's destory method.
Delete connection as a class field and make every method to check in and check out connection if it need.
Make a every method check in and check out DBConnection if this method need a connection.
In returnDBConnection method, a new parameter named serialNumber was added. It will compare to the checkOutSerialNumber in DBConnection.
Add a new attribute named checkOutSerialNumber, which to make sure when DBConnection would not be check in mutiple times.
Add the code to handle error in the respone for a update request.
Add test ssl work or not in handleUpdateRequest method too.
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