Hello Alvaro,
You might have better luck on KeyCloak list or forum (https://www.keycloak.org/community). WildFly itself should ship with the SmallRye implementation of the MP Config. I'm not sure whether or not it can be replaced with another implementation, though I've never tried.

What does the module.xml file look like for /Users/alvarena/hki/keycloak/standalone/keycloak-13.0.0/modules/system/layers/base/org/jboss/resteasy/resteasy-jaxrs/main/module.xml?

On Thu, May 27, 2021 at 6:57 AM Alvaro Arenas <alvaro.arenas@gmail.com> wrote:
Hi,

I am adding my project to a stream down wildfly v23 (withou microservices modules) and I use smallrye-config in my project. When adding my deployment with the microprofile configuration package incleded (for example  "org.apache.geronimo.config:geronimo-config-impl:1.2.2") the souces in the file org.eclipse.microprofile.config.spi.ConfigSource  get automatically added by wildfly but the implementation class is not found.

I get the following error

Caused by: java.lang.NoClassDefFoundError: Failed to link org/jboss/resteasy/microprofile/config/ServletConfigSource (Module "org.jboss.resteasy.resteasy-jaxrs" version 3.15.1.Final from local module loader @fc1522fa (finder: local module finder @4332406a (roots: /Users/alvarena/hki/keycloak/standalone/keycloak-13.0.0/modules,/Users/alvarena/hki/keycloak/standalone/keycloak-13.0.0/modules/system/layers/keycloak,/Users/alvarena/hki/keycloak/standalone/keycloak-13.0.0/modules/system/layers/base))): org.eclipse.microprofile.config.spi.ConfigSource
        at java.lang.ClassLoader.defineClassImpl(Native Method)
        at java.lang.ClassLoader.defineClassInternal(ClassLoader.java:398)
        at java.lang.ClassLoader.defineClass(ClassLoader.java:359)
        at org.jboss.modules.ModuleClassLoader.doDefineOrLoadClass(ModuleClassLoader.java:423)
        at org.jboss.modules.ModuleClassLoader.defineClass(ModuleClassLoader.java:555)
        at org.jboss.modules.ModuleClassLoader.loadClassLocal(ModuleClassLoader.java:339)
        at org.jboss.modules.ModuleClassLoader$1.loadClassLocal(ModuleClassLoader.java:126)
        at org.jboss.modules.Module.loadModuleClass(Module.java:753)
        at org.jboss.modules.ModuleClassLoader.findClass(ModuleClassLoader.java:247)
        at org.jboss.modules.ConcurrentClassLoader.performLoadClassUnchecked(ConcurrentClassLoader.java:410)
        at org.jboss.modules.ConcurrentClassLoader.performLoadClass(ConcurrentClassLoader.java:398)
        at org.jboss.modules.ConcurrentClassLoader.loadClass(ConcurrentClassLoader.java:116)
        at java.lang.Class.forNameImpl(Native Method)
        at java.lang.Class.forName(Class.java:408)
        at java.util.ServiceLoader$LazyIterator.nextService(ServiceLoader.java:370)
        at java.util.ServiceLoader$LazyIterator.next(ServiceLoader.java:404)
        at java.util.ServiceLoader$1.next(ServiceLoader.java:480)
        at java.lang.Iterable.forEach(Iterable.java:74)
        at org.apache.geronimo.config.DefaultConfigBuilder.build(DefaultConfigBuilder.java:130)
        at org.apache.geronimo.config.DefaultConfigProvider.getConfig(DefaultConfigProvider.java:62)
        at org.apache.geronimo.config.DefaultConfigProvider.getConfig(DefaultConfigProvider.java:46)
        at org.eclipse.microprofile.config.ConfigProvider.getConfig(ConfigProvider.java:93)
        at org.apache.geronimo.config.cdi.ConfigExtension.validate(ConfigExtension.java:123)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at org.jboss.weld.injection.StaticMethodInjectionPoint.invoke(StaticMethodInjectionPoint.java:95)
        ... 26 more

I don't understand how the system is able to find the file org.eclipse.microprofile.config.spi.ConfigSource but not the implementation classes that are in the same package.

Any idea what could be wrong

Best regards,

Alvaro
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