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Can you specify how to see the problem? When I clone your project and run

./gradlew build

it complains that it uses an invalid target version. When I try again with Java 17, I get compile errors from

:micronaut-form-login:compileJava

intellij gives you warnings in the build tab and then does not show the tasks in the gradle tab. this is still useful feedback that i guess it is basically not visible at all if not looking

Ah, I see, thanks. You have plugin

io.micronaut.application

applied on

:gallery-sharer

and on

:micronaut-form-login-text

sibling projects individually. This way they end up in different class loaders and so class

GraalVMReachabilityMetadataService

is present twice, once on each class loader and incompatible as they are different class instances if they come from different class loaders. So if classes from the one want to communicate with classes from the other, you get a problem. If you make sure both projects get the classes from the same class loader by adding the classes to a common parent class loader it works. So if you for example add a

build.gradle

for the root project and put in it

plugins {
    id 'io.micronaut.application' version '3.6.6' apply false
    id 'io.micronaut.library' version '3.6.6' apply false
    id 'com.github.johnrengelman.shadow' version '7.1.2' apply false
}

and also change the

io.micronaut.application

version in

:gallery-sharer

to be the same 3.6.6 version (or you can also leave out the version then), it works properly.

works like a charm, how did you know that they would be the same class loader if loaded up from a parent build.gradle? (anything to read up on? going to try to apply this pattern elsewhere - seems like the way i was doing it will stop working when eventually other plugins also add build services.)

I just know the class loader hierarchy in Gradle roughly. 🙂

ill keep an eye out for those i guess https://www.google.com/search?q=site%3Ablog.gradle.org+classloader

No, was some 3rd party blog

thanks for the link and the fix