Data validation is a crucial part of any application. We can find data validation in:
UI layer before sending objects to the server
At the server side before processing it
Before persisting data into the database
Validation is a cross cutting concern/task, so as good practice, we should try to keep it apart from our business logic. JSR303 and JSR349 provides specification for bean validation by using annotations.
This framework provides the reference implementation for JSR303 and JSR349 specifications.
