Validation of non-default methods not being executed

Code sample: https://github.com/bklava/struts

In the example, in the index action/page, there are 2 forms: the difference is that the form 1 submits to the action without setting a method (then calling the default execute() method), while the form 2 submits to the same action but calling a specific method.

The validator is set annotating the field setter method, so it should be available either to the default execute method and to the non-default method. This is exactly the behaviour obtained when using Struts 2.3.14.3.

After switching to Struts 2.3.15, the form 2 validation is not executed at all.

As far as I can tell, this difference is due to changes made in org.apache.struts2.components.Form.getValidators(String name)