Sporadic "Client is closed" in resteasy-reactive <= keycloak-admin-client <= readiness check

[famod]

Hi all (maybe especially @geoand & @sberyozkin),

since about two weeks were are getting the following error very sporadically in our custom readiness check that uses the keycloak-admin-client:

java.lang.IllegalStateException: Client is closed
	at org.jboss.resteasy.reactive.client.impl.ClientImpl.abortIfClosed(ClientImpl.java:239)
	at org.jboss.resteasy.reactive.client.impl.WebTargetImpl.abortIfClosed(WebTargetImpl.java:329)
	at org.jboss.resteasy.reactive.client.impl.WebTargetImpl.resolveTemplate(WebTargetImpl.java:108)
	at org.jboss.resteasy.reactive.client.impl.WebTargetImpl.resolveTemplate(WebTargetImpl.java:25)
	at org.keycloak.admin.client.resource.RealmsResource$$QuarkusRestClientInterface.realm(Unknown Source)
	at org.keycloak.admin.client.Keycloak.realm(Keycloak.java:146)
	at org.keycloak.admin.client.Keycloak_UWuGrtXQbAUeC9_5MBr5rdaRQ0Y_Synthetic_ClientProxy.realm(Unknown Source)

While I can't rule out sporadic network issues, we haven't had such issues before the 1st of Feb and we've been running those readiness checks for many months now.
I tried to narrow down the keycloak and quarkus versions involved and I think this might be a lead:

• issue did not occur with Quarkus 3.6.5 but does with 3.6.8 or 3.7.1 - if it's actually caused on the client side at all!
• issue did not occur with Keycloak Server 23.0.4 (powered by Quarkus 3.2.9) but does with Keycloak 23.0.5 (Quarkus 3.2.10) - if it's actually caused on the server side at all!

Does that ring a bell? Any hints?

Thanks!

[quarkus-bot[bot]]

/cc @FroMage (resteasy-reactive), @geoand (resteasy-reactive), @pedroigor (keycloak), @sberyozkin (keycloak), @stuartwdouglas (resteasy-reactive)

[geoand]

Very weird... Unfortunately I don't have any insights given this information :(

[sberyozkin]

@famod I can try to bump the version to 23.0.6 and add a debug log message to the reactive client informing when it has been closed...

[famod]

You mean on the Quarkus side? Yes please, even if just as a draft PR. Thanks!

[sberyozkin]

@famod it is Keycloak 22.0.5, not 23.0.5, in 3.2.10.
Well I can add that log message and propose to backport it, not sure what else can be done, please review the commit summary between 3.2.9 and 3.2.10

[famod]

@famod it is Keycloak 22.0.5, not 23.0.5, in 3.2.10.

Are you sure?

2024-02-01 14:41:12,816 INFO [io.quarkus] (main) Keycloak 23.0.5 on JVM (powered by Quarkus 3.2.10.Final) started in 6.449s. Listening on: http://0.0.0.0:8080

Or, more recently:

2024-02-13 11:59:35,679 INFO [io.quarkus] (main) Keycloak 23.0.6 on JVM (powered by Quarkus 3.2.10.Final) started in 129.712s. Listening on: http://0.0.0.0:8080

Edit: Ah, you mean the version of the kc-admin client in Quarkus. Yeah ok. I meant the version of Quarkus in the respective Keycloak server.

[sberyozkin]

@famod https://github.com/quarkusio/quarkus/blob/3.2.10.Final/bom/application/pom.xml#L193

So, I'm a little bit confused now, as now I indeed see you were referring to the Keycloak server itself. But in any case, I opened a PR adding a log message to org.jboss.resteasy.reactive.client.impl.ClientImpl#close

[famod]

Sorry for the confusion. I mentioned the server versions because at this point it's not 100% clear to me where the actual root cause is located (client or server). I think it's on the client side which is also where the exception is logged.

[sberyozkin]

@famod Sure, np at all, lets see if that added log message will help identify something, at what moment it is closed. It may take a bit of time to trace the cause. Maybe you could try the 3.2 branch to test it further, in the remote debug mode if possible, to see at what point close is called

[sberyozkin]

@famod, if you are only seeing it on the server, please also consider opening a Keycloak issue as the Keycloak team may be aware of something related

[famod]

@sberyozkin so, on branch 3.7 I changed the debug call (that you've added recently to ClientImpl) to info and included the entire stacktrace and here is what I got:

	at org.jboss.resteasy.reactive.client.impl.ClientImpl.close(ClientImpl.java:236)
	at org.keycloak.admin.client.Keycloak.close(Keycloak.java:177)
	at io.quarkus.keycloak.admin.client.common.AutoCloseableDestroyer.destroy(AutoCloseableDestroyer.java:15)
	at io.quarkus.keycloak.admin.client.common.AutoCloseableDestroyer.destroy(AutoCloseableDestroyer.java:9)
	at org.keycloak.admin.client.Keycloak_UWuGrtXQbAUeC9_5MBr5rdaRQ0Y_Synthetic_Bean.doDestroy(Unknown Source)
	at org.keycloak.admin.client.Keycloak_UWuGrtXQbAUeC9_5MBr5rdaRQ0Y_Synthetic_Bean.destroy(Unknown Source)
	at org.keycloak.admin.client.Keycloak_UWuGrtXQbAUeC9_5MBr5rdaRQ0Y_Synthetic_Bean.destroy(Unknown Source)
	at io.quarkus.arc.impl.AbstractInstanceHandle.destroyInternal(AbstractInstanceHandle.java:78)
	at io.quarkus.arc.impl.ContextInstanceHandleImpl.destroy(ContextInstanceHandleImpl.java:26)
	at io.quarkus.arc.generator.Default_jakarta_enterprise_context_RequestScoped_ContextInstances.removeEach(Unknown Source)
	at io.quarkus.arc.impl.RequestContext.destroy(RequestContext.java:217)
	at io.quarkus.arc.impl.RequestContext.destroy(RequestContext.java:200)
	at io.quarkus.arc.ManagedContext.terminate(ManagedContext.java:50)
	at io.quarkus.smallrye.health.runtime.SmallRyeHealthHandlerBase.handle(SmallRyeHealthHandlerBase.java:37)
	at io.quarkus.smallrye.health.runtime.SmallRyeReadinessHandler.handle(SmallRyeReadinessHandler.java:8)
	at io.quarkus.smallrye.health.runtime.SmallRyeHealthHandlerBase.handle(SmallRyeHealthHandlerBase.java:23)
	at io.vertx.ext.web.impl.RouteState.handleContext(RouteState.java:1285)
	at io.vertx.ext.web.impl.RoutingContextImplBase.iterateNext(RoutingContextImplBase.java:177)
	at io.vertx.ext.web.impl.RoutingContextWrapper.next(RoutingContextWrapper.java:200)
	at io.vertx.ext.web.impl.RouterImpl.handleContext(RouterImpl.java:250)
	at io.vertx.ext.web.impl.RouteState.handleContext(RouteState.java:1285)
	at io.vertx.ext.web.impl.RoutingContextImplBase.iterateNext(RoutingContextImplBase.java:177)
	at io.vertx.ext.web.impl.RoutingContextImpl.next(RoutingContextImpl.java:137)
	at io.quarkus.vertx.http.runtime.options.HttpServerCommonHandlers$1.handle(HttpServerCommonHandlers.java:62)
	at io.quarkus.vertx.http.runtime.options.HttpServerCommonHandlers$1.handle(HttpServerCommonHandlers.java:40)
	at io.vertx.ext.web.impl.RouteState.handleContext(RouteState.java:1285)
	at io.vertx.ext.web.impl.RoutingContextImplBase.iterateNext(RoutingContextImplBase.java:177)
	at io.vertx.ext.web.impl.RoutingContextImpl.next(RoutingContextImpl.java:137)
	at io.quarkus.vertx.http.runtime.security.AbstractHttpAuthorizer.doPermissionCheck(AbstractHttpAuthorizer.java:119)
	at io.quarkus.vertx.http.runtime.security.AbstractHttpAuthorizer.checkPermission(AbstractHttpAuthorizer.java:93)
	at io.quarkus.vertx.http.runtime.security.HttpAuthorizer.checkPermission(HttpAuthorizer.java:22)
	at io.quarkus.vertx.http.runtime.security.HttpSecurityRecorder$1.handle(HttpSecurityRecorder.java:68)
	at io.quarkus.vertx.http.runtime.security.HttpSecurityRecorder$1.handle(HttpSecurityRecorder.java:60)
	at io.vertx.ext.web.impl.RouteState.handleContext(RouteState.java:1285)
	at io.vertx.ext.web.impl.RoutingContextImplBase.iterateNext(RoutingContextImplBase.java:177)
	at io.vertx.ext.web.impl.RoutingContextImpl.next(RoutingContextImpl.java:137)
	at io.quarkus.resteasy.reactive.server.runtime.ResteasyReactiveRecorder$13.handle(ResteasyReactiveRecorder.java:339)
	at io.quarkus.resteasy.reactive.server.runtime.ResteasyReactiveRecorder$13.handle(ResteasyReactiveRecorder.java:332)
	at io.vertx.ext.web.impl.RouteState.handleContext(RouteState.java:1285)
	at io.vertx.ext.web.impl.RoutingContextImplBase.iterateNext(RoutingContextImplBase.java:177)
	at io.vertx.ext.web.impl.RoutingContextImpl.next(RoutingContextImpl.java:137)
	at io.quarkus.vertx.http.runtime.security.HttpSecurityRecorder$AbstractAuthenticationHandler$3$1.onItem(HttpSecurityRecorder.java:301)
	at io.quarkus.vertx.http.runtime.security.HttpSecurityRecorder$AbstractAuthenticationHandler$3$1.onItem(HttpSecurityRecorder.java:291)
	at io.smallrye.mutiny.operators.uni.UniOnItemTransformToUni$UniOnItemTransformToUniProcessor.onItem(UniOnItemTransformToUni.java:60)
	at io.smallrye.mutiny.operators.uni.builders.DefaultUniEmitter.complete(DefaultUniEmitter.java:37)
	at io.smallrye.mutiny.groups.UniOnNull.lambda$failWith$1(UniOnNull.java:46)
	at io.smallrye.context.impl.wrappers.SlowContextualBiConsumer.accept(SlowContextualBiConsumer.java:21)
	at io.smallrye.mutiny.groups.UniOnItem.lambda$transformToUni$4(UniOnItem.java:177)
	at io.smallrye.context.impl.wrappers.SlowContextualConsumer.accept(SlowContextualConsumer.java:21)
	at io.smallrye.mutiny.operators.uni.builders.UniCreateWithEmitter.subscribe(UniCreateWithEmitter.java:22)
	at io.smallrye.mutiny.operators.AbstractUni.subscribe(AbstractUni.java:36)
	at io.smallrye.mutiny.operators.uni.UniOnItemTransformToUni$UniOnItemTransformToUniProcessor.performInnerSubscription(UniOnItemTransformToUni.java:81)
	at io.smallrye.mutiny.operators.uni.UniOnItemTransformToUni$UniOnItemTransformToUniProcessor.onItem(UniOnItemTransformToUni.java:57)
	at io.smallrye.mutiny.operators.uni.builders.UniCreateFromKnownItem$KnownItemSubscription.forward(UniCreateFromKnownItem.java:38)
	at io.smallrye.mutiny.operators.uni.builders.UniCreateFromKnownItem.subscribe(UniCreateFromKnownItem.java:23)
	at io.smallrye.mutiny.operators.AbstractUni.subscribe(AbstractUni.java:36)
	at io.smallrye.mutiny.operators.uni.UniOnItemTransformToUni.subscribe(UniOnItemTransformToUni.java:25)
	at io.smallrye.mutiny.operators.AbstractUni.subscribe(AbstractUni.java:36)
	at io.smallrye.mutiny.groups.UniSubscribe.withSubscriber(UniSubscribe.java:51)
	at io.quarkus.vertx.http.runtime.security.HttpSecurityRecorder$AbstractAuthenticationHandler$3.onItem(HttpSecurityRecorder.java:291)
	at io.quarkus.vertx.http.runtime.security.HttpSecurityRecorder$AbstractAuthenticationHandler$3.onItem(HttpSecurityRecorder.java:276)
	at io.smallrye.mutiny.operators.uni.UniMemoizeOp.forwardTo(UniMemoizeOp.java:123)
	at io.smallrye.mutiny.operators.uni.UniMemoizeOp.notifyAwaiters(UniMemoizeOp.java:135)
	at io.smallrye.mutiny.operators.uni.UniMemoizeOp.onItem(UniMemoizeOp.java:97)
	at io.smallrye.mutiny.operators.uni.UniOnItemTransformToUni$UniOnItemTransformToUniProcessor.onItem(UniOnItemTransformToUni.java:60)
	at io.smallrye.mutiny.operators.uni.builders.UniCreateFromKnownItem$KnownItemSubscription.forward(UniCreateFromKnownItem.java:38)
	at io.smallrye.mutiny.operators.uni.builders.UniCreateFromKnownItem.subscribe(UniCreateFromKnownItem.java:23)
	at io.smallrye.mutiny.operators.AbstractUni.subscribe(AbstractUni.java:36)
	at io.smallrye.mutiny.operators.uni.UniOnItemTransformToUni$UniOnItemTransformToUniProcessor.performInnerSubscription(UniOnItemTransformToUni.java:81)
	at io.smallrye.mutiny.operators.uni.UniOnItemTransformToUni$UniOnItemTransformToUniProcessor.onItem(UniOnItemTransformToUni.java:57)
	at io.smallrye.mutiny.operators.uni.UniOnItemTransform$UniOnItemTransformProcessor.onItem(UniOnItemTransform.java:43)
	at io.smallrye.mutiny.operators.uni.UniOnItemTransform$UniOnItemTransformProcessor.onItem(UniOnItemTransform.java:43)
	at io.smallrye.mutiny.operators.uni.builders.UniCreateFromKnownItem$KnownItemSubscription.forward(UniCreateFromKnownItem.java:38)
	at io.smallrye.mutiny.operators.uni.builders.UniCreateFromKnownItem.subscribe(UniCreateFromKnownItem.java:23)
	at io.smallrye.mutiny.operators.AbstractUni.subscribe(AbstractUni.java:36)
	at io.smallrye.mutiny.operators.uni.UniOnItemTransform.subscribe(UniOnItemTransform.java:22)
	at io.smallrye.mutiny.operators.AbstractUni.subscribe(AbstractUni.java:36)
	at io.smallrye.mutiny.operators.uni.UniOnItemTransform.subscribe(UniOnItemTransform.java:22)
	at io.smallrye.mutiny.operators.AbstractUni.subscribe(AbstractUni.java:36)
	at io.smallrye.mutiny.operators.uni.UniOnItemTransformToUni.subscribe(UniOnItemTransformToUni.java:25)
	at io.smallrye.mutiny.operators.AbstractUni.subscribe(AbstractUni.java:36)
	at io.smallrye.mutiny.groups.UniSubscribe.withSubscriber(UniSubscribe.java:51)
	at io.smallrye.mutiny.operators.uni.UniMemoizeOp.subscribe(UniMemoizeOp.java:59)
	at io.smallrye.mutiny.operators.AbstractUni.subscribe(AbstractUni.java:36)
	at io.smallrye.mutiny.groups.UniSubscribe.withSubscriber(UniSubscribe.java:51)
	at io.quarkus.vertx.http.runtime.security.HttpSecurityRecorder$AbstractAuthenticationHandler.handle(HttpSecurityRecorder.java:276)
	at io.quarkus.vertx.http.runtime.security.HttpSecurityRecorder$AbstractAuthenticationHandler.handle(HttpSecurityRecorder.java:224)
	at io.vertx.ext.web.impl.RouteState.handleContext(RouteState.java:1285)
	at io.vertx.ext.web.impl.RoutingContextImplBase.iterateNext(RoutingContextImplBase.java:177)
	at io.vertx.ext.web.impl.RoutingContextImpl.next(RoutingContextImpl.java:137)
	at io.vertx.ext.web.impl.RouterImpl.handle(RouterImpl.java:68)
	at io.vertx.ext.web.impl.RouterImpl.handle(RouterImpl.java:37)
	at io.quarkus.vertx.http.runtime.options.HttpServerCommonHandlers$2.handle(HttpServerCommonHandlers.java:86)
	at io.quarkus.vertx.http.runtime.options.HttpServerCommonHandlers$2.handle(HttpServerCommonHandlers.java:69)
	at io.quarkus.vertx.http.runtime.VertxHttpRecorder$1.handle(VertxHttpRecorder.java:147)
	at io.quarkus.vertx.http.runtime.VertxHttpRecorder$1.handle(VertxHttpRecorder.java:123)
	at io.vertx.core.impl.ContextImpl.emit(ContextImpl.java:335)
	at io.vertx.core.impl.DuplicatedContext.emit(DuplicatedContext.java:176)
	at io.vertx.core.http.impl.Http1xServerConnection.handleMessage(Http1xServerConnection.java:174)
	at io.vertx.core.net.impl.ConnectionBase.read(ConnectionBase.java:159)
	at io.vertx.core.net.impl.VertxHandler.channelRead(VertxHandler.java:153)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:442)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:420)
	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:412)
	at io.vertx.core.http.impl.Http1xUpgradeToH2CHandler.channelRead(Http1xUpgradeToH2CHandler.java:124)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:444)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:420)
	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:412)
	at io.netty.handler.timeout.IdleStateHandler.channelRead(IdleStateHandler.java:286)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:442)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:420)
	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:412)
	at io.netty.handler.codec.ByteToMessageDecoder.fireChannelRead(ByteToMessageDecoder.java:346)
	at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:318)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:444)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:420)
	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:412)
	at io.vertx.core.http.impl.Http1xOrH2CHandler.end(Http1xOrH2CHandler.java:61)
	at io.vertx.core.http.impl.Http1xOrH2CHandler.channelRead(Http1xOrH2CHandler.java:38)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:444)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:420)
	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:412)
	at io.netty.handler.timeout.IdleStateHandler.channelRead(IdleStateHandler.java:286)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:442)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:420)
	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:412)
	at io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1410)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:440)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:420)
	at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:919)
	at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:166)
	at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:788)
	at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:724)
	at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:650)
	at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:562)
	at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:997)
	at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
	at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
	at java.base/java.lang.Thread.run(Unknown Source)

So its SmallRyeHealthHandlerBase terminating the requestContext it has activated shortly before the doHandle call.
This has been like that for a very long time it seems.

/cc @mkouba

PS: Let's forget about 3.2 for now and focus on the client side Quarkus, which is 3.7.3 in my case.

[sberyozkin]

@famod thanks, good that debug message has helped to track it, can you please create an issue from this discussion ? I'm not sure what is the right fix should be, may be it is related to #38605

[famod]

Sure, I'll create an issue.

FTR, the stacktrace of the actual "Client is closed" exception can also look like this:

java.lang.IllegalStateException: Client is closed
	at io.vertx.core.http.impl.HttpClientImpl.checkClosed(HttpClientImpl.java:405)
	at io.vertx.core.http.impl.HttpClientImpl.doRequest(HttpClientImpl.java:281)
	at io.vertx.core.http.impl.HttpClientImpl.request(HttpClientImpl.java:184)
	at org.jboss.resteasy.reactive.client.handlers.ClientSendRequestHandler$5.lambda$apply$0(ClientSendRequestHandler.java:434)
	at io.smallrye.context.impl.wrappers.SlowContextualConsumer.accept(SlowContextualConsumer.java:21)
	at org.jboss.resteasy.reactive.client.AsyncResultUni.subscribe(AsyncResultUni.java:31)
	at io.smallrye.mutiny.operators.AbstractUni.subscribe(AbstractUni.java:36)
	at io.smallrye.mutiny.operators.uni.UniOnItemTransformToUni$UniOnItemTransformToUniProcessor.performInnerSubscription(UniOnItemTransformToUni.java:81)
	at io.smallrye.mutiny.operators.uni.UniOnItemTransformToUni$UniOnItemTransformToUniProcessor.onItem(UniOnItemTransformToUni.java:57)
	at io.smallrye.mutiny.operators.uni.UniOnItemConsume$UniOnItemComsumeProcessor.onItem(UniOnItemConsume.java:43)
	at io.smallrye.mutiny.operators.uni.UniOnItemTransform$UniOnItemTransformProcessor.onItem(UniOnItemTransform.java:43)
	at io.smallrye.mutiny.operators.uni.builders.UniCreateFromKnownItem$KnownItemSubscription.forward(UniCreateFromKnownItem.java:38)
	at io.smallrye.mutiny.operators.uni.builders.UniCreateFromKnownItem.subscribe(UniCreateFromKnownItem.java:23)
	at io.smallrye.mutiny.operators.AbstractUni.subscribe(AbstractUni.java:36)
	at io.smallrye.mutiny.operators.uni.UniOnItemTransform.subscribe(UniOnItemTransform.java:22)
	at io.smallrye.mutiny.operators.AbstractUni.subscribe(AbstractUni.java:36)
	at io.smallrye.mutiny.operators.uni.UniOnItemConsume.subscribe(UniOnItemConsume.java:30)
	at io.smallrye.mutiny.operators.AbstractUni.subscribe(AbstractUni.java:36)
	at io.smallrye.mutiny.operators.uni.UniOnItemTransformToUni.subscribe(UniOnItemTransformToUni.java:25)
	at io.smallrye.mutiny.operators.AbstractUni.subscribe(AbstractUni.java:36)
	at io.smallrye.mutiny.groups.UniSubscribe.withSubscriber(UniSubscribe.java:51)
	at io.smallrye.mutiny.groups.UniSubscribe.with(UniSubscribe.java:110)
	at io.smallrye.mutiny.groups.UniSubscribe.with(UniSubscribe.java:88)
	at org.jboss.resteasy.reactive.client.handlers.ClientSendRequestHandler.handle(ClientSendRequestHandler.java:94)
	at org.jboss.resteasy.reactive.client.handlers.ClientSendRequestHandler.handle(ClientSendRequestHandler.java:66)
	at org.jboss.resteasy.reactive.common.core.AbstractResteasyReactiveContext.invokeHandler(AbstractResteasyReactiveContext.java:231)
	at org.jboss.resteasy.reactive.common.core.AbstractResteasyReactiveContext.run(AbstractResteasyReactiveContext.java:147)
	at org.jboss.resteasy.reactive.client.impl.AsyncInvokerImpl.performRequestInternal(AsyncInvokerImpl.java:285)
	at org.jboss.resteasy.reactive.client.impl.AsyncInvokerImpl.performRequestInternal(AsyncInvokerImpl.java:275)
	at org.jboss.resteasy.reactive.client.impl.AsyncInvokerImpl.method(AsyncInvokerImpl.java:215)
	at org.jboss.resteasy.reactive.client.impl.InvocationBuilderImpl.method(InvocationBuilderImpl.java:324)
	at org.keycloak.admin.client.resource.UsersResourcecec060e01a4e8719a5229b25492913298e3846fc54.count(Unknown Source)
	at de.someproject.connector.keycloak.client.KeycloakUserApiClient.readinessCheck(KeycloakUserApiClient.java:40)
	at ...

[famod]

Reported #38866