It might be worthwhile to consider a one-line validator annotation. In place of

@NotNull
@Length (min = 1, max = 100)
@Pattern (regex = "[A-Z]*")
private String someAttribute ;

We could have something like:

@Validate (nullable = false, minLength = 1, maxLength = 100, regex = "[A-Z]*")
private String someAttribute ;

With some sensible defaults...
boolean nullable default true
int minLength default -1
int maxLength default -1
String regex default null

What is wrong with:

@NotNull @Length (min = 1, max = 100) @Pattern (regex = "[A-Z]*")
private String someAttribute ;

and furthermore @Validate would not provide very good compile validation/code completion.