Github user ajs6f commented on the issue:
https://github.com/apache/incubator-tamaya-extensions/pull/12
Woo-hoo! I can confirm that
```
@Inject
@Config
private Optional<String> myConfigVal;
```
works, and so (not surprisingly) does:
```
@Inject
@Config(value={"someKey","anotherKey"})
private Optional<String> myConfigVal;
```
Thank you so much @peculater !---
