This lesson shows you how to add the display for the error messages, so that failure messages can be returned out to input.jsp.
When using ActionErrors, you need to add the ActionErrors tag to
display the error message in the input.jsp. This also requires the action
mapping to be modified to include an input field.
To update the action
so that it will forward any errors found in bean validation out to the input.jsp
page. In the DateData class, verify that the user input year is less than
year 1582, then it will return an error with the "pre-gregorian" message.
The "pre-gregorian" date is defined in the ApplicationResources.properties
file after the errors.header and error.footer comment. 
- Do this.
- Then do this.
Describe or show the results of the steps they just followed.