Major Description
There's a substring indexing bug in the wicket-bean-validation module in org.apache.wicket.bean.validation.DefaultPropertyResolver that causes it to only work with direct field access and fail when field is missing and getter method should be used.
The problem is on this line:
String name = getter.getName().substring(3, 1).toLowerCase() + getter.getName().substring(4);
Which should be:
String name = getter.getName().substring(3, 4).toLowerCase() + getter.getName().substring(4);
(or simply a single character access)