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https://issues.apache.org/jira/browse/TAMAYA-358?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16688381#comment-16688381
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ASF GitHub Bot commented on TAMAYA-358:
---------------------------------------
Github user peculater commented on the issue:
https://github.com/apache/incubator-tamaya-extensions/pull/12
For that use I'd go with
```
@Inject
@Config
private Optional<String> myConfigVal;
```
The default config name is the name of the variable, and
"required=(true|false)" doesn't change the result if you're using Optional<T>.
I'm super interested in how well this works for you. :-)
> No way to inject an optional config value via CDI
> -------------------------------------------------
>
> Key: TAMAYA-358
> URL: https://issues.apache.org/jira/browse/TAMAYA-358
> Project: Tamaya
> Issue Type: Bug
> Affects Versions: 0.3-incubating
> Reporter: A. Soroka
> Priority: Minor
> Labels: cdi, injection, optional
>
> It's not possible to use {{@Config}} to inject an optional value in a CDI
> project. None of the following work:
> {code:java}
> @Inject
> @Config(value = { "trellis.configFile", "TRELLIS_CONFIG_FILE" },
> required=false)
> private File configFile;
> {code}
> {code:java}
> @Inject
> @Config(value = { "trellis.configFile", "TRELLIS_CONFIG_FILE" },
> required=false)
> private Optional<File> configFile;
> {code}
> {code:java}
> @Inject
> @Config(value = { "trellis.configFile", "TRELLIS_CONFIG_FILE" })
> private Optional<File> configFile;
> {code}
> All throw a
> {noformat}
> org.apache.tamaya.ConfigException: Cannot resolve any of the possible
> configuration keys: [trellis.configFile, TRELLIS_CONFIG_FILE]. Please provide
> one of the given keys with a value in your configuration sources.
> {noformat}
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