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public class SimpleField extends ActionSupport{
    @NotNull()
    @NotEmpty
    @Length(max = 3)
    private String name;
...
}

Use the @AssertValid annotation to validate nested objects, like

public class MemberObject extends ActionSupport {
    @AssertValid
    private Person person = new Person();

    public Person getPerson() {
        return person;
    }
}

XML Configuration

OVal provides support for defining the validation via XML. Validation files must end in "-validation.xml" and the rules to find them, are the same rules used to find the validation XML files used by the regular validation mechanisms (default validation in xwork):

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