[~niematojaktomasz] Athough it's not 100% clear from the spec (it's arguable what *contains* exactly means) I believe that nested wildcards are forbidden too, i.e. {{List<Optional<?>>}} is not a legal bean type either.
See also the "3.3. Producer methods":
{quote}
If a producer method *return type contains a wildcard type parameter* or is an array type whose component type contains a wildcard type parameter, the container automatically detects the problem and treats it as a definition error.
{quote}
Feel free to create a CDI spec clarification issue.
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