* Add custom license header style in order to comply with Google's Checkstyle format
* Update license headers to comply with Google's Checkstyle format
* 508 : Sonar qube critical Issue Fix
Refactor this method to reduce its Cognitive Complexity from 30 to the 15 allowed.
* 508: Sonar Qube Issue fxes
Define a constant instead of duplicating this literal " does not exist." 3 times.
* 508: sonar qube issue fixes
Define a constant instead of duplicating this literal "Some external api for only realtime execution could be called here." 3 times.
* Made minor changes in some patterns such as removed throws clause where not needed, changed incorrect order of arguments in assertEquals
* Minor refactorings and code style changes. 1) Removed several use of raw types 2) Removed unnecessary throws clauses 3) Used lambda expressions wherever applicable 4) Used apt assertion methods for readability 5) Use of try with resources wherever applicable 6) Corrected incorrect order of assertXXX arguments
* Removed unused import from Promise
* Addressed review comments
* Addressed checkstyle issue
- final fields are marked as final
- removed unnecessary temp variables
- added private constructor for not instantiated static class AccountAggregate
- path of te test file is corrected
