How to read map of config data using Config microprofile?

[David Hoffer]

I want to be able to specify a list of key/value pairs in my application.yml file and inject using @ConfigProperty but I get a runtime error.

app:
  response-headers:
     header1 : value1
     header2 : value2  
     header3 : value3  
     header4 : value4  

public AppLifecycle(@ConfigProperty(name = "app.response-headers") Map<String, String> responseHeaders) {
this.responseHeaders = responseHeaders;
}

But I get this error:

Caused by: java.lang.IllegalArgumentException: SRCFG00013: No Converter registered for interface java.util.Map

        at io.smallrye.config.SmallRyeConfig.lambda$getConverter$2(SmallRyeConfig.java:289)

        at java.base/java.util.concurrent.ConcurrentHashMap.computeIfAbsent(ConcurrentHashMap.java:1705)

        at io.smallrye.config.SmallRyeConfig.getConverter(SmallRyeConfig.java:286)

        at io.smallrye.config.SmallRyeConfig.getValue(SmallRyeConfig.java:141)

        at io.quarkus.arc.runtime.ConfigBeanCreator.create(ConfigBeanCreator.java:48)

I tried HashMap too.

Do I have to configure SmallRyeConfig to read a Map somehow?

-Dave

[Roberto Cortez]

Hi David,

Config Maps are not supported out of the box yet. I’m working in some prototypes to add support to them.

The YamlConfigSource exposes the source yaml in config value itself, so you could write a Converter for it. Check this out:

https://github.com/smallrye/smallrye-config/blob/1.x/sources/yaml/src/test/java/io/smallrye/config/source/yaml/YamlConfigSourceTest.java#L69-L80

Let me know if this works for you.

Cheers,

Roberto

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[David Hoffer]

Hum, I couldn't follow that.  Also I tried the complex object approach shown on the Quarkus website but could not get that to work either.

I ended up just reading a list and parsing it myself to generate the Map.  Looking forward to seeing your updates to this to support Maps/etc.

app:
  response-headers:
     - header1=value1
     - header2=value2  
     - header3=value3  
     - header4=value4    

-Dave

[Georgios Andrianakis]

On Wed, Feb 3, 2021 at 1:32 AM 'Roberto Cortez' via Quarkus Development mailing list <quark...@googlegroups.com> wrote:

Hi David,

Config Maps are not supported out of the box yet. I’m working in some prototypes to add support to them.

We do have some support for them in Quarkus as described in https://quarkus.io/guides/kubernetes-config

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