According to specification on group sequences.

If at least one constraint fails in a sequenced group, none of the constraints of the following groups in the sequence get validated

HV can sometime proceed to validating constraints from the next group in the sequence when the current group extends any other groups. Example of such sequence:

interface Group1 extends Group11, Group12 {}

interface Group11 {}

interface Group12 {}

interface Group2 {}

@GroupSequence({ Foo.class, Group1.class, Group2.class })
class Foo {
	@NotNull(groups = SequenceTest.Group11.class)
	private String str1;
	@NotNull(groups = SequenceTest.Group12.class)
	private String str2;
	@NotNull(groups = SequenceTest.Group2.class)
	private String str3;
}

In this case if either one of `str1` `str2` is null `str3` should not be validated. But it sometimes can be!