JPA storage configuration. Initial data read (no transactions)

--amend
Exercise 7: Full JPA support
Refactoring message properties
Refactoring. Adding cannonical request
Thinning the controller
Process running flag in cannonical object
Exercise 8: refactoring - extracting command pattern and encapsulate command logic (including validation) in command classes
renaming test classes
Adding error information
Making isValid() method generic for all commands
Empty command for no-existent command
Adding log4j in proper src/main path
Exercise 9: custom transaction rollback operations
Constraints more generic (not only CommandParameters)
VoidCommand validtor - not valid command information
Local variable no longer needed
Refactoring cannonical request - only use TranslationProcess for pocessing
Audit invocation test
Exercise 10: Advanced validation. Save word validation with custom validator