Bug: ConfigProperty annotation on Map<String, String> field doesn't filter the configuration values, but populates all configuration entries in Map

For a map configuration field like below, i expect the map to be populated with all configuration entries under configKey section, but the map is populated with all possible configuration entries - without any filtering.

    @Inject
    @ConfigProperty(name = "configKey")
    Map<String, String> configKeyMap;

Is this behaviour expected??? Is there a provision to filter out the configuration entries that just match to the name mentioned in the annotation?

If i understand correctly, filtration happens properly for List and Set field types (at-least as per the code for those branches). Why the behaviour is different for Map alone???

Environment Details

• Helidon Version: 2.5.1
• Helidon MP
• JDK version: JDK 17
• OS: Windows 11
• Docker version (if applicable): NA

[tomas-langer]

As this is not tested, we did not catch the difference in behavior. This was quite a big change (we had to switch away from using Helidon SE Config to using a full implementation of MP Config due to differences in handling environment variables), I have missed it when implementing it. We will get back to this and restore the original behavior

[tomas-langer]

In the PR:

• injection of map with a name defined in @ConfigProperty will inject only properties prefixed by that key, with the key removed from keys of the map
• injection of map with default name will inject all properties available in config
• I have added a test to verify this behavior