Unable to create AuthzClient in Java

[Alessandro Grassi]

Hi! I am trying to create the AuthzClient object because I want to add and remove some resources under the ProtectedResource.

The problem, though, is that I get this message at runtime "Uncaught server error: java.lang.NoClassDefFoundError: org/keycloak/authorization/client/AuthzClient” when trying to create the object. I have added the dependency within the POM.xml and even put the JAR in the class path, just to be sure. My Keycloak server is installed on a KaliLinux machine and I use macOS to package the JAR extension for it.
What could I do to fix it?

This is the console log, I don't know if it will be useful.

ERROR [org.keycloak.services.error.KeycloakErrorHandler] (executor-thread-2) Uncaught server error: java.lang.NoClassDefFoundError: org/keycloak/authorization/client/AuthzClient
    at it.aboutbits.CustomEventListenerProvider.<init>(CustomEventListenerProvider.java:106)
    at it.aboutbits.CustomEventListenerProviderFactory.create(CustomEventListenerProviderFactory.java:12)
    at it.aboutbits.CustomEventListenerProviderFactory.create(CustomEventListenerProviderFactory.java:9)
    at org.keycloak.services.DefaultKeycloakSession.getProvider(DefaultKeycloakSession.java:333)
    at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:104)
    at java.base/java.lang.reflect.Method.invoke(Method.java:577)
    at org.jboss.resteasy.core.ContextParameterInjector$GenericDelegatingProxy.invoke(ContextParameterInjector.java:166)
    at jdk.proxy2/jdk.proxy2.$Proxy56.getProvider(Unknown Source)
    at org.keycloak.services.resources.admin.AdminEventBuilder.lambda$addListeners$0(AdminEventBuilder.java:101)
    at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183)
    at java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:179)
    at java.base/java.util.HashMap$KeySpliterator.forEachRemaining(HashMap.java:1707)
    at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:509)
    at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:499)
    at java.base/java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150)
    at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173)
    at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
    at java.base/java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:596)
    at org.keycloak.services.resources.admin.AdminEventBuilder.addListeners(AdminEventBuilder.java:100)
    at org.keycloak.services.resources.admin.AdminEventBuilder.<init>(AdminEventBuilder.java:57)
    at org.keycloak.services.resources.admin.RealmsAdminResource.getRealmAdmin(RealmsAdminResource.java:181)
    at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:104)
    at java.base/java.lang.reflect.Method.invoke(Method.java:577)
    at org.jboss.resteasy.core.ResourceLocatorInvoker.constructLocator(ResourceLocatorInvoker.java:107)
    at org.jboss.resteasy.core.ResourceLocatorInvoker.resolveTargetFromLocator(ResourceLocatorInvoker.java:87)
    at org.jboss.resteasy.core.ResourceLocatorInvoker.invoke(ResourceLocatorInvoker.java:148)
    at org.jboss.resteasy.core.ResourceLocatorInvoker.invokeOnTargetObject(ResourceLocatorInvoker.java:183)
    at org.jboss.resteasy.core.ResourceLocatorInvoker.invoke(ResourceLocatorInvoker.java:141)
    at org.jboss.resteasy.core.ResourceLocatorInvoker.invoke(ResourceLocatorInvoker.java:32)
    at org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:492)
    at org.jboss.resteasy.core.SynchronousDispatcher.lambda$invoke$4(SynchronousDispatcher.java:261)
    at org.jboss.resteasy.core.SynchronousDispatcher.lambda$preprocess$0(SynchronousDispatcher.java:161)
    at org.jboss.resteasy.core.interception.jaxrs.PreMatchContainerRequestContext.filter(PreMatchContainerRequestContext.java:364)
    at org.jboss.resteasy.core.SynchronousDispatcher.preprocess(SynchronousDispatcher.java:164)
    at org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:247)
    at io.quarkus.resteasy.runtime.standalone.RequestDispatcher.service(RequestDispatcher.java:73)
    at io.quarkus.resteasy.runtime.standalone.VertxRequestHandler.dispatch(VertxRequestHandler.java:151)
    at io.quarkus.resteasy.runtime.standalone.VertxRequestHandler.handle(VertxRequestHandler.java:82)
    at io.quarkus.resteasy.runtime.standalone.VertxRequestHandler.handle(VertxRequestHandler.java:42)
    at io.vertx.ext.web.impl.RouteState.handleContext(RouteState.java:1212)
    at io.vertx.ext.web.impl.RoutingContextImplBase.iterateNext(RoutingContextImplBase.java:163)
    at io.vertx.ext.web.impl.RoutingContextImpl.next(RoutingContextImpl.java:141)
    at io.quarkus.vertx.http.runtime.StaticResourcesRecorder$2.handle(StaticResourcesRecorder.java:67)
    at io.quarkus.vertx.http.runtime.StaticResourcesRecorder$2.handle(StaticResourcesRecorder.java:55)
    at io.vertx.ext.web.impl.RouteState.handleContext(RouteState.java:1212)
    at io.vertx.ext.web.impl.RoutingContextImplBase.iterateNext(RoutingContextImplBase.java:163)
    at io.vertx.ext.web.impl.RoutingContextImpl.next(RoutingContextImpl.java:141)
    at io.quarkus.vertx.http.runtime.VertxHttpRecorder$5.handle(VertxHttpRecorder.java:362)
    at io.quarkus.vertx.http.runtime.VertxHttpRecorder$5.handle(VertxHttpRecorder.java:340)
    at io.vertx.ext.web.impl.RouteState.handleContext(RouteState.java:1212)
    at io.vertx.ext.web.impl.RoutingContextImplBase.iterateNext(RoutingContextImplBase.java:163)
    at io.vertx.ext.web.impl.RoutingContextImpl.next(RoutingContextImpl.java:141)
    at org.keycloak.quarkus.runtime.integration.web.QuarkusRequestFilter.lambda$createBlockingHandler$1(QuarkusRequestFilter.java:66)
    at io.vertx.core.impl.ContextImpl.lambda$null$0(ContextImpl.java:159)
    at io.vertx.core.impl.AbstractContext.dispatch(AbstractContext.java:100)
    at io.vertx.core.impl.ContextImpl.lambda$executeBlocking$1(ContextImpl.java:157)
    at io.quarkus.vertx.core.runtime.VertxCoreRecorder$13.runWith(VertxCoreRecorder.java:543)
    at org.jboss.threads.EnhancedQueueExecutor$Task.run(EnhancedQueueExecutor.java:2449)
    at org.jboss.threads.EnhancedQueueExecutor$ThreadBody.run(EnhancedQueueExecutor.java:1478)
    at org.jboss.threads.DelegatingRunnable.run(DelegatingRunnable.java:29)
    at org.jboss.threads.ThreadLocalResettingRunnable.run(ThreadLocalResettingRunnable.java:29)
    at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
    at java.base/java.lang.Thread.run(Thread.java:833)
Caused by: java.lang.ClassNotFoundException: org.keycloak.authorization.client.AuthzClient
    at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:641)
    at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:188)
    at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:521)
    at io.quarkus.bootstrap.runner.RunnerClassLoader.loadClass(RunnerClassLoader.java:107)
    at io.quarkus.bootstrap.runner.RunnerClassLoader.loadClass(RunnerClassLoader.java:57)
    ... 63 more