RequestFactoryServlet needs both javax.validation and org.json (and if you 
want to use bean validation, then you also need an implementation for 
javax.validation, such as Hibernate Validator).
If you don't have a validator, you'll have a log record at startup that it 
cannot create a validator, but then it'll work OK (I believe it's more a 
warning for developers to give them a hint if they expect validation to 
work).
Have a look at the pom.xml for the Expenses project, which contains the 
appropriate dependencies.

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