There are 2 different corner cases that I can think of.

Using the legacy @Valid and a type argument @Valid:

@Valid
@ConvertGroup(blabla)
private List<@Valid @ConvertGroup(blibli)> property;

The other one is how we deal with nested cascading.

Let's say, we have the following:

private Map<String, @Valid @ConvertGroup(blabla) MyContainer<@Valid @ConvertGroup(BliBli) MyBean>> property;

In the current version of the RI, the convert groups are applied in cascade i.e. for MyBean, they are converted twice.