Bug: Keycloak: Invalid value for frontendUrl

09:58:17,293 INFO  [org.keycloak.services] (ServerService Thread Pool -- 64) KC-SERVICES0001: Loading config from standalone.xml or domain.xml
09:58:20,736 FATAL [org.keycloak.services] (ServerService Thread Pool -- 64) Error during startup: java.lang.RuntimeException: Invalid value for frontendUrl
	at org.keycloak.keycloak-services@12.0.4//org.keycloak.url.DefaultHostnameProviderFactory.init(DefaultHostnameProviderFactory.java:34)
	at org.keycloak.keycloak-services@12.0.4//org.keycloak.services.DefaultKeycloakSessionFactory.loadFactories(DefaultKeycloakSessionFactory.java:244)
	at org.keycloak.keycloak-services@12.0.4//org.keycloak.services.DefaultKeycloakSessionFactory.init(DefaultKeycloakSessionFactory.java:92)
	at org.keycloak.keycloak-services@12.0.4//org.keycloak.services.resources.KeycloakApplication.createSessionFactory(KeycloakApplication.java:260)
	at org.keycloak.keycloak-services@12.0.4//org.keycloak.services.resources.KeycloakApplication.startup(KeycloakApplication.java:125)
	at org.keycloak.keycloak-wildfly-extensions@12.0.4//org.keycloak.provider.wildfly.WildflyPlatform.onStartup(WildflyPlatform.java:29)
	at org.keycloak.keycloak-services@12.0.4//org.keycloak.services.resources.KeycloakApplication.<init>(KeycloakApplication.java:115)
	at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
	at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
	at java.base/jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
	at java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:490)
	at org.jboss.resteasy.resteasy-jaxrs@3.13.2.Final//org.jboss.resteasy.core.ConstructorInjectorImpl.construct(ConstructorInjectorImpl.java:152)
	at org.jboss.resteasy.resteasy-jaxrs@3.13.2.Final//org.jboss.resteasy.spi.ResteasyProviderFactory.createProviderInstance(ResteasyProviderFactory.java:2815)
	at org.jboss.resteasy.resteasy-jaxrs@3.13.2.Final//org.jboss.resteasy.spi.ResteasyDeployment.createApplication(ResteasyDeployment.java:371)
	at org.jboss.resteasy.resteasy-jaxrs@3.13.2.Final//org.jboss.resteasy.spi.ResteasyDeployment.startInternal(ResteasyDeployment.java:283)
	at org.jboss.resteasy.resteasy-jaxrs@3.13.2.Final//org.jboss.resteasy.spi.ResteasyDeployment.start(ResteasyDeployment.java:93)
	at org.jboss.resteasy.resteasy-jaxrs@3.13.2.Final//org.jboss.resteasy.plugins.server.servlet.ServletContainerDispatcher.init(ServletContainerDispatcher.java:140)
	at org.jboss.resteasy.resteasy-jaxrs@3.13.2.Final//org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.init(HttpServletDispatcher.java:42)
	at io.undertow.servlet@2.2.2.Final//io.undertow.servlet.core.LifecyleInterceptorInvocation.proceed(LifecyleInterceptorInvocation.java:117)
	at org.wildfly.extension.undertow@21.0.2.Final//org.wildfly.extension.undertow.security.RunAsLifecycleInterceptor.init(RunAsLifecycleInterceptor.java:78)
	at io.undertow.servlet@2.2.2.Final//io.undertow.servlet.core.LifecyleInterceptorInvocation.proceed(LifecyleInterceptorInvocation.java:103)
	at io.undertow.servlet@2.2.2.Final//io.undertow.servlet.core.ManagedServlet$DefaultInstanceStrategy.start(ManagedServlet.java:305)
	at io.undertow.servlet@2.2.2.Final//io.undertow.servlet.core.ManagedServlet.createServlet(ManagedServlet.java:145)
	at io.undertow.servlet@2.2.2.Final//io.undertow.servlet.core.DeploymentManagerImpl$2.call(DeploymentManagerImpl.java:588)
	at io.undertow.servlet@2.2.2.Final//io.undertow.servlet.core.DeploymentManagerImpl$2.call(DeploymentManagerImpl.java:559)
	at io.undertow.servlet@2.2.2.Final//io.undertow.servlet.core.ServletRequestContextThreadSetupAction$1.call(ServletRequestContextThreadSetupAction.java:42)
	at io.undertow.servlet@2.2.2.Final//io.undertow.servlet.core.ContextClassLoaderSetupAction$1.call(ContextClassLoaderSetupAction.java:43)
	at org.wildfly.extension.undertow@21.0.2.Final//org.wildfly.extension.undertow.security.SecurityContextThreadSetupAction.lambda$create$0(SecurityContextThreadSetupAction.java:105)
	at org.wildfly.extension.undertow@21.0.2.Final//org.wildfly.extension.undertow.deployment.UndertowDeploymentInfoService$UndertowThreadSetupAction.lambda$create$0(UndertowDeploymentInfoService.java:1530)
	at org.wildfly.extension.undertow@21.0.2.Final//org.wildfly.extension.undertow.deployment.UndertowDeploymentInfoService$UndertowThreadSetupAction.lambda$create$0(UndertowDeploymentInfoService.java:1530)
	at org.wildfly.extension.undertow@21.0.2.Final//org.wildfly.extension.undertow.deployment.UndertowDeploymentInfoService$UndertowThreadSetupAction.lambda$create$0(UndertowDeploymentInfoService.java:1530)
	at org.wildfly.extension.undertow@21.0.2.Final//org.wildfly.extension.undertow.deployment.UndertowDeploymentInfoService$UndertowThreadSetupAction.lambda$create$0(UndertowDeploymentInfoService.java:1530)
	at io.undertow.servlet@2.2.2.Final//io.undertow.servlet.core.DeploymentManagerImpl.start(DeploymentManagerImpl.java:601)
	at org.wildfly.extension.undertow@21.0.2.Final//org.wildfly.extension.undertow.deployment.UndertowDeploymentService.startContext(UndertowDeploymentService.java:97)
	at org.wildfly.extension.undertow@21.0.2.Final//org.wildfly.extension.undertow.deployment.UndertowDeploymentService$1.run(UndertowDeploymentService.java:78)
	at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515)
	at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
	at org.jboss.threads@2.4.0.Final//org.jboss.threads.ContextClassLoaderSavingRunnable.run(ContextClassLoaderSavingRunnable.java:35)
	at org.jboss.threads@2.4.0.Final//org.jboss.threads.EnhancedQueueExecutor.safeRun(EnhancedQueueExecutor.java:1990)
	at org.jboss.threads@2.4.0.Final//org.jboss.threads.EnhancedQueueExecutor$ThreadBody.doRunTask(EnhancedQueueExecutor.java:1486)
	at org.jboss.threads@2.4.0.Final//org.jboss.threads.EnhancedQueueExecutor$ThreadBody.run(EnhancedQueueExecutor.java:1377)
	at java.base/java.lang.Thread.run(Thread.java:829)
	at org.jboss.threads@2.4.0.Final//org.jboss.threads.JBossThread.run(JBossThread.java:513)
Caused by: java.net.URISyntaxException: Illegal character in scheme name at index 0: $E_APP_BASE_URL:8181/auth
	at java.base/java.net.URI$Parser.fail(URI.java:2913)
	at java.base/java.net.URI$Parser.checkChars(URI.java:3084)
	at java.base/java.net.URI$Parser.checkChar(URI.java:3094)
	at java.base/java.net.URI$Parser.parse(URI.java:3109)
	at java.base/java.net.URI.<init>(URI.java:600)
	at org.keycloak.keycloak-services@12.0.4//org.keycloak.url.DefaultHostnameProviderFactory.init(DefaultHostnameProviderFactory.java:32)
	... 42 more
Definition of Done:

fix it
Hints:

none...
Edited Jun 16, 2021 by Ilka Schulz