The referenced property 'quarkus.uuid' has no default value.

[fbricon]

In application.properties, foo=${quarkus.uuid} generates an error:

The referenced property 'quarkus.uuid' has no default value.

But it's perfectly valid as per:

https://quarkus.io/guides/config-reference#accessing-a-generating-uuid

[fbricon]

the default value is injected at runtime: https://github.com/quarkusio/quarkus/blob/e6423a404758f30e121506a311ec9a445cc27dc9/core/runtime/src/main/java/io/quarkus/runtime/configuration/ConfigUtils.java#L67

@angelozerr how can we fix it?

• is there a way to override quarkus.uuid via custom properties, given it a "generated at runtime" default value. But then what happens if you also set quarkus.uuid=something in application.properties?
• should we just not report missing default values when they're coming from jars? (I think it's the safest)

[fbricon]

I tried adding this to resources/static-properties/quarkus-core-metadata.json:

"properties": [
	{
		"type": "java.lang.String",
		"defaultValue": "Generated at startup time",
		"required": false,
		"extensionName": "quarkus-core",
		"name": "quarkus.uuid",
		"description": "Random UUID value generated at startup time"
	}
]

Inlay hint takes the defaultValue, but validation ignores it.

(Why the double error message??)

The good news is manually setting quarkus.uuid=something in application properties works as expected.

[angelozerr]

I tried adding this to resources/static-properties/quarkus-core-metadata.json:

If you do that, you will have 2 quarkus.uuid properties (one coming from Java, and the one coming from your json descriptor).

(Why the double error message??)

I think it is because there are 2 properties

is there a way to override quarkus.uuid via custom properties, given it a "generated at runtime" default value. But then what happens if you also set quarkus.uuid=something in application.properties?

We could improve the json descriptor with "merge" behavior instead of adding a new property to set a default value.

should we just not report missing default values when they're coming from jars? (I think it's the safest)

I think it is not a good idea if property from JAR is required to assign it (but I have not some usecase).

[angelozerr]

Perhaps the proper fix is to use the ConfigPhase.

package io.quarkus.runtime;

import io.quarkus.runtime.annotations.ConfigPhase;
import io.quarkus.runtime.annotations.ConfigRoot;
import io.smallrye.config.ConfigMapping;
import io.smallrye.config.WithName;
import java.net.URI;
import java.util.List;
import java.util.Optional;

@ConfigMapping(
    prefix = "quarkus"
)
@ConfigRoot(
    phase = ConfigPhase.RUN_TIME
)
public interface ConfigConfig {
...
    Optional<String> uuid();
}

If ConfigPhase == RUN_TIME, we should not validate the default value?

[fbricon]

If ConfigPhase == RUN_TIME, we should not validate the default value?
We can start with that.

Maybe @ia3andy or @gsmet can confirm whether we need to validate references from jar files