Hey everyone, I am trying to create users via the REST-API and I am stuck. When I try to post a user representation to Keycloak (after successfully logging in over the API) via script (Python using the requests framework) I get a 500 back and in the logfile of my Keycloak instance I find: 10:50:40,268 ERROR [org.keycloak.services.error.KeycloakErrorHandler] (default task-4) Uncaught server error: com.fasterxml.jackson.databind.JsonMappingException: Can not construct instance of org.keycloak.representations.idm.UserRepresentation: no String-argument constructor/factory method to deserialize from String value ('{"username": "TNG", "enabled": true, "attributes": {"ito_BinderLevelID1": ["1ACD47D7B9AFA0A9C12582E00048F997"], "ito_BinderLevelID2": ["0D6E18BCBDD3B14BC12582E1002AE459"]}, "credentials": [{"hashedSaltedValue": "02514a38a0f3e7c7f8eed0c7d4ce7bf25e48c845", "salt": "05ef149e8ccce076e30d6388aeedc03583dd75b4c4d88f380b094ba5c06df21b", "algorithm": "pbkdf2"}], "groups": ["/Bonding.Keycloak:CompanyEditor"]}')  at [Source: io.undertow.servlet.spec.ServletInputStreamImpl@1d3521de; line: 1, column: 1]         at com.fasterxml.jackson.databind.JsonMappingException.from(JsonMappingException.java:270)         at com.fasterxml.jackson.databind.DeserializationContext.instantiationException(DeserializationContext.java:1456)         at com.fasterxml.jackson.databind.DeserializationContext.handleMissingInstantiator(DeserializationContext.java:1012)         at com.fasterxml.jackson.databind.deser.ValueInstantiator._createFromStringFallbacks(ValueInstantiator.java:370)         at com.fasterxml.jackson.databind.deser.std.StdValueInstantiator.createFromString(StdValueInstantiator.java:315)         at com.fasterxml.jackson.databind.deser.BeanDeserializerBase.deserializeFromString(BeanDeserializerBase.java:1283)         at com.fasterxml.jackson.databind.deser.BeanDeserializer._deserializeOther(BeanDeserializer.java:159)         at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserialize(BeanDeserializer.java:150)         at com.fasterxml.jackson.databind.ObjectReader._bind(ObjectReader.java:1583)         at com.fasterxml.jackson.databind.ObjectReader.readValue(ObjectReader.java:964)         at org.jboss.resteasy.plugins.providers.jackson.ResteasyJackson2Provider.readFrom(ResteasyJackson2Provider.java:134)         at org.jboss.resteasy.core.interception.AbstractReaderInterceptorContext.readFrom(AbstractReaderInterceptorContext.java:66)         at org.jboss.resteasy.core.interception.ServerReaderInterceptorContext.readFrom(ServerReaderInterceptorContext.java:61)         at org.jboss.resteasy.core.interception.AbstractReaderInterceptorContext.proceed(AbstractReaderInterceptorContext.java:56)         at org.jboss.resteasy.security.doseta.DigitalVerificationInterceptor.aroundReadFrom(DigitalVerificationInterceptor.java:36)         at org.jboss.resteasy.core.interception.AbstractReaderInterceptorContext.proceed(AbstractReaderInterceptorContext.java:59)         at org.jboss.resteasy.core.MessageBodyParameterInjector.inject(MessageBodyParameterInjector.java:151)         at org.jboss.resteasy.core.MethodInjectorImpl.injectArguments(MethodInjectorImpl.java:92)         at org.jboss.resteasy.core.MethodInjectorImpl.invoke(MethodInjectorImpl.java:115)         at org.jboss.resteasy.core.ResourceMethodInvoker.invokeOnTarget(ResourceMethodInvoker.java:295)         at org.jboss.resteasy.core.ResourceMethodInvoker.invoke(ResourceMethodInvoker.java:249)         at org.jboss.resteasy.core.ResourceLocatorInvoker.invokeOnTargetObject(ResourceLocatorInvoker.java:138)         at org.jboss.resteasy.core.ResourceLocatorInvoker.invoke(ResourceLocatorInvoker.java:107)         at org.jboss.resteasy.core.ResourceLocatorInvoker.invokeOnTargetObject(ResourceLocatorInvoker.java:133)         at org.jboss.resteasy.core.ResourceLocatorInvoker.invoke(ResourceLocatorInvoker.java:107)         at org.jboss.resteasy.core.ResourceLocatorInvoker.invokeOnTargetObject(ResourceLocatorInvoker.java:133)         at org.jboss.resteasy.core.ResourceLocatorInvoker.invoke(ResourceLocatorInvoker.java:101)         at org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:406)         at org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:213)         at org.jboss.resteasy.plugins.server.servlet.ServletContainerDispatcher.service(ServletContainerDispatcher.java:228)         at org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.service(HttpServletDispatcher.java:56)         at org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.service(HttpServletDispatcher.java:51)         at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)         at io.undertow.servlet.handlers.ServletHandler.handleRequest(ServletHandler.java:85)         at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:129)         at org.keycloak.services.filters.KeycloakSessionServletFilter.doFilter(KeycloakSessionServletFilter.java:90)         at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61)         at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131)         at io.undertow.servlet.handlers.FilterHandler.handleRequest(FilterHandler.java:84)         at io.undertow.servlet.handlers.security.ServletSecurityRoleHandler.handleRequest(ServletSecurityRoleHandler.java:62)         at io.undertow.servlet.handlers.ServletDispatchingHandler.handleRequest(ServletDispatchingHandler.java:36)         at org.wildfly.extension.undertow.security.SecurityContextAssociationHandler.handleRequest(SecurityContextAssociationHandler.java:78)         at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)         at io.undertow.servlet.handlers.security.SSLInformationAssociationHandler.handleRequest(SSLInformationAssociationHandler.java:131)         at io.undertow.servlet.handlers.security.ServletAuthenticationCallHandler.handleRequest(ServletAuthenticationCallHandler.java:57)         at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)         at io.undertow.security.handlers.AbstractConfidentialityHandler.handleRequest(AbstractConfidentialityHandler.java:46)         at io.undertow.servlet.handlers.security.ServletConfidentialityConstraintHandler.handleRequest(ServletConfidentialityConstraintHandler.java:64)         at io.undertow.security.handlers.AuthenticationMechanismsHandler.handleRequest(AuthenticationMechanismsHandler.java:60)         at io.undertow.servlet.handlers.security.CachedAuthenticatedSessionHandler.handleRequest(CachedAuthenticatedSessionHandler.java:77)         at io.undertow.security.handlers.NotificationReceiverHandler.handleRequest(NotificationReceiverHandler.java:50)         at io.undertow.security.handlers.AbstractSecurityContextAssociationHandler.handleRequest(AbstractSecurityContextAssociationHandler.java:43)         at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)         at org.wildfly.extension.undertow.security.jacc.JACCContextIdHandler.handleRequest(JACCContextIdHandler.java:61)         at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)         at org.wildfly.extension.undertow.deployment.GlobalRequestControllerHandler.handleRequest(GlobalRequestControllerHandler.java:68)         at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)         at io.undertow.servlet.handlers.ServletInitialHandler.handleFirstRequest(ServletInitialHandler.java:292)         at io.undertow.servlet.handlers.ServletInitialHandler.access$100(ServletInitialHandler.java:81)         at io.undertow.servlet.handlers.ServletInitialHandler$2.call(ServletInitialHandler.java:138)         at io.undertow.servlet.handlers.ServletInitialHandler$2.call(ServletInitialHandler.java:135)         at io.undertow.servlet.core.ServletRequestContextThreadSetupAction$1.call(ServletRequestContextThreadSetupAction.java:48)         at io.undertow.servlet.core.ContextClassLoaderSetupAction$1.call(ContextClassLoaderSetupAction.java:43)         at org.wildfly.extension.undertow.security.SecurityContextThreadSetupAction.lambda$create$0(SecurityContextThreadSetupAction.java:105)         at org.wildfly.extension.undertow.deployment.UndertowDeploymentInfoService$UndertowThreadSetupAction.lambda$create$0(UndertowDeploymentInfoService.java:1508)         at org.wildfly.extension.undertow.deployment.UndertowDeploymentInfoService$UndertowThreadSetupAction.lambda$create$0(UndertowDeploymentInfoService.java:1508)         at org.wildfly.extension.undertow.deployment.UndertowDeploymentInfoService$UndertowThreadSetupAction.lambda$create$0(UndertowDeploymentInfoService.java:1508)         at org.wildfly.extension.undertow.deployment.UndertowDeploymentInfoService$UndertowThreadSetupAction.lambda$create$0(UndertowDeploymentInfoService.java:1508)         at io.undertow.servlet.handlers.ServletInitialHandler.dispatchRequest(ServletInitialHandler.java:272)         at io.undertow.servlet.handlers.ServletInitialHandler.access$000(ServletInitialHandler.java:81)         at io.undertow.servlet.handlers.ServletInitialHandler$1.handleRequest(ServletInitialHandler.java:104)         at io.undertow.server.Connectors.executeRootHandler(Connectors.java:326)         at io.undertow.server.HttpServerExchange$1.run(HttpServerExchange.java:812)         at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)         at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)         at java.lang.Thread.run(Thread.java:748) When I try to create a user via Postman (after logging in) with the user being: {"username": "testuser1", "enabled": true, "attributes": {"ito_BinderLevelID1": ["32523129C2061E50C12581E60033075A"], "ito_BinderLevelID2": ["3AD0E53463EBC8F1C12581E600342FA2"]}, "groups": ["/Bonding.Keycloak:CompanyEditor"], "credentials": [{"hashedSaltedValue": "aa8c848ee6ac308a24e1e1bce1559902009f988a", "salt": "ab079c7702d171a2e558f940a7edda5e4e206005b2440eaab68cf6ad6938fe76", "algorithm": "pbkdf2"}]} I get a 201 but when I try to look up the user via the Web GUI User Page tells me "*Error!* An unexpected server error has occurred" and I find in the logfile: 11:45:40,852 WARN  [org.keycloak.events] (default task-4) type=REFRESH_TOKEN_ERROR, realmId=master, clientId=security-admin-console, userId=null, ipAddress=127.0.0.1, error=invalid_token, grant_type=refresh_token, client_auth_method=client-secret 11:45:50,339 ERROR [org.keycloak.services.error.KeycloakErrorHandler] (default task-4) Uncaught server error: java.lang.NullPointerException         at org.keycloak.models.jpa.JpaUserProvider.lambda$getStoredCredentialsByType$0(JpaUserProvider.java:976)         at java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:174)         at java.util.Iterator.forEachRemaining(Iterator.java:116)         at java.util.Spliterators$IteratorSpliterator.forEachRemaining(Spliterators.java:1801)         at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:481)         at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:471)         at java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:708)         at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)         at java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:499)         at org.keycloak.models.jpa.JpaUserProvider.getStoredCredentialsByType(JpaUserProvider.java:976)         at org.keycloak.credential.UserCredentialStoreManager.getStoredCredentialsByType(UserCredentialStoreManager.java:87)         at org.keycloak.credential.OTPCredentialProvider.configuredForTOTP(OTPCredentialProvider.java:198)         at org.keycloak.credential.OTPCredentialProvider.isConfiguredFor(OTPCredentialProvider.java:179)         at org.keycloak.credential.UserCredentialStoreManager.isConfiguredLocally(UserCredentialStoreManager.java:283)         at org.keycloak.credential.UserCredentialStoreManager.isConfiguredFor(UserCredentialStoreManager.java:276)         at org.keycloak.models.utils.ModelToRepresentation.toRepresentation(ModelToRepresentation.java:148)         at org.keycloak.services.resources.admin.UsersResource.getUsers(UsersResource.java:225)         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.resteasy.core.MethodInjectorImpl.invoke(MethodInjectorImpl.java:140)         at org.jboss.resteasy.core.ResourceMethodInvoker.invokeOnTarget(ResourceMethodInvoker.java:295)         at org.jboss.resteasy.core.ResourceMethodInvoker.invoke(ResourceMethodInvoker.java:249)         at org.jboss.resteasy.core.ResourceLocatorInvoker.invokeOnTargetObject(ResourceLocatorInvoker.java:138)         at org.jboss.resteasy.core.ResourceLocatorInvoker.invoke(ResourceLocatorInvoker.java:107)         at org.jboss.resteasy.core.ResourceLocatorInvoker.invokeOnTargetObject(ResourceLocatorInvoker.java:133)         at org.jboss.resteasy.core.ResourceLocatorInvoker.invoke(ResourceLocatorInvoker.java:107)         at org.jboss.resteasy.core.ResourceLocatorInvoker.invokeOnTargetObject(ResourceLocatorInvoker.java:133)         at org.jboss.resteasy.core.ResourceLocatorInvoker.invoke(ResourceLocatorInvoker.java:101)         at org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:406)         at org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:213)         at org.jboss.resteasy.plugins.server.servlet.ServletContainerDispatcher.service(ServletContainerDispatcher.java:228)         at org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.service(HttpServletDispatcher.java:56)         at org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.service(HttpServletDispatcher.java:51)         at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)         at io.undertow.servlet.handlers.ServletHandler.handleRequest(ServletHandler.java:85)         at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:129)         at org.keycloak.services.filters.KeycloakSessionServletFilter.doFilter(KeycloakSessionServletFilter.java:90)         at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61)         at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131)         at io.undertow.servlet.handlers.FilterHandler.handleRequest(FilterHandler.java:84)         at io.undertow.servlet.handlers.security.ServletSecurityRoleHandler.handleRequest(ServletSecurityRoleHandler.java:62)         at io.undertow.servlet.handlers.ServletDispatchingHandler.handleRequest(ServletDispatchingHandler.java:36)         at org.wildfly.extension.undertow.security.SecurityContextAssociationHandler.handleRequest(SecurityContextAssociationHandler.java:78)         at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)         at io.undertow.servlet.handlers.security.SSLInformationAssociationHandler.handleRequest(SSLInformationAssociationHandler.java:131)         at io.undertow.servlet.handlers.security.ServletAuthenticationCallHandler.handleRequest(ServletAuthenticationCallHandler.java:57)         at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)         at io.undertow.security.handlers.AbstractConfidentialityHandler.handleRequest(AbstractConfidentialityHandler.java:46)         at io.undertow.servlet.handlers.security.ServletConfidentialityConstraintHandler.handleRequest(ServletConfidentialityConstraintHandler.java:64)         at io.undertow.security.handlers.AuthenticationMechanismsHandler.handleRequest(AuthenticationMechanismsHandler.java:60)         at io.undertow.servlet.handlers.security.CachedAuthenticatedSessionHandler.handleRequest(CachedAuthenticatedSessionHandler.java:77)         at io.undertow.security.handlers.NotificationReceiverHandler.handleRequest(NotificationReceiverHandler.java:50)         at io.undertow.security.handlers.AbstractSecurityContextAssociationHandler.handleRequest(AbstractSecurityContextAssociationHandler.java:43)         at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)         at org.wildfly.extension.undertow.security.jacc.JACCContextIdHandler.handleRequest(JACCContextIdHandler.java:61)         at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)         at org.wildfly.extension.undertow.deployment.GlobalRequestControllerHandler.handleRequest(GlobalRequestControllerHandler.java:68)         at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)         at io.undertow.servlet.handlers.ServletInitialHandler.handleFirstRequest(ServletInitialHandler.java:292)         at io.undertow.servlet.handlers.ServletInitialHandler.access$100(ServletInitialHandler.java:81)         at io.undertow.servlet.handlers.ServletInitialHandler$2.call(ServletInitialHandler.java:138)         at io.undertow.servlet.handlers.ServletInitialHandler$2.call(ServletInitialHandler.java:135)         at io.undertow.servlet.core.ServletRequestContextThreadSetupAction$1.call(ServletRequestContextThreadSetupAction.java:48)         at io.undertow.servlet.core.ContextClassLoaderSetupAction$1.call(ContextClassLoaderSetupAction.java:43)         at org.wildfly.extension.undertow.security.SecurityContextThreadSetupAction.lambda$create$0(SecurityContextThreadSetupAction.java:105)         at org.wildfly.extension.undertow.deployment.UndertowDeploymentInfoService$UndertowThreadSetupAction.lambda$create$0(UndertowDeploymentInfoService.java:1508)         at org.wildfly.extension.undertow.deployment.UndertowDeploymentInfoService$UndertowThreadSetupAction.lambda$create$0(UndertowDeploymentInfoService.java:1508)         at org.wildfly.extension.undertow.deployment.UndertowDeploymentInfoService$UndertowThreadSetupAction.lambda$create$0(UndertowDeploymentInfoService.java:1508)         at org.wildfly.extension.undertow.deployment.UndertowDeploymentInfoService$UndertowThreadSetupAction.lambda$create$0(UndertowDeploymentInfoService.java:1508)         at io.undertow.servlet.handlers.ServletInitialHandler.dispatchRequest(ServletInitialHandler.java:272)         at io.undertow.servlet.handlers.ServletInitialHandler.access$000(ServletInitialHandler.java:81)         at io.undertow.servlet.handlers.ServletInitialHandler$1.handleRequest(ServletInitialHandler.java:104)         at io.undertow.server.Connectors.executeRootHandler(Connectors.java:326)         at io.undertow.server.HttpServerExchange$1.run(HttpServerExchange.java:812)         at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)         at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)         at java.lang.Thread.run(Thread.java:748) I figure there is something wrong with my JSON, but I can't figure out what exactly it is. I tried googling this Problem, but I did could not find an answer. Could you help me please ? Best regards Lars Liedtke -- punkt.de GmbH * Kaiserallee 13a * 76133 Karlsruhe Tel. 0721 9109 0 * Fax 0721 9109 100 info(a)punkt.de https://www.punkt.de Gf: Jürgen Egeling AG Mannheim 108285