title: Cannot create resource in keycloak - Getting unknown exception
body: <p>In keycloak admin when I try to create a resource, I get a '500' unknown exception error.  Looking at the logs, it appears a search call is made on the new resource name that returns the '500' error because media type is not present?  I have not done any customizations or set any properties on my instance.</p>
  
  <p>Keycloak version is 10.0 and i've used Oracle jdk 8 and open jdk 11
  The full error trace is:</p>
  
  <pre><code>08:41:02,795 ERROR [org.keycloak.headers.DefaultSecurityHeadersProvider] (default task-15) MediaType not set on path /auth/admin/realms/MyRealm/clients/6d7c8a64-e725-41f3-a488-9e150eed57cf/authz/resource-server/resource/search, with response status 200
  08:41:02,807 ERROR [org.keycloak.services.error.KeycloakErrorHandler] (default task-15) Uncaught server error: javax.ws.rs.InternalServerErrorException: HTTP 500 Internal Server Error
          at org.keycloak.keycloak-services@10.0.0//org.keycloak.headers.DefaultSecurityHeadersProvider.addHeaders(DefaultSecurityHeadersProvider.java:71)
          at org.keycloak.keycloak-services@10.0.0//org.keycloak.services.filters.KeycloakSecurityHeadersFilter.filter(KeycloakSecurityHeadersFilter.java:36)
          at org.jboss.resteasy.resteasy-jaxrs@3.11.0.Final//org.jboss.resteasy.core.interception.ContainerResponseContextImpl.filter(ContainerResponseContextImpl.java:356)
          at org.jboss.resteasy.resteasy-jaxrs@3.11.0.Final//org.jboss.resteasy.core.ServerResponseWriter.executeFilters(ServerResponseWriter.java:219)
          at org.jboss.resteasy.resteasy-jaxrs@3.11.0.Final//org.jboss.resteasy.core.ServerResponseWriter.writeNomapResponse(ServerResponseWriter.java:95)
          at org.jboss.resteasy.resteasy-jaxrs@3.11.0.Final//org.jboss.resteasy.core.ServerResponseWriter.writeNomapResponse(ServerResponseWriter.java:69)
          at org.jboss.resteasy.resteasy-jaxrs@3.11.0.Final//org.jboss.resteasy.core.SynchronousDispatcher.writeResponse(SynchronousDispatcher.java:530)
          at org.jboss.resteasy.resteasy-jaxrs@3.11.0.Final//org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:461)
          at org.jboss.resteasy.resteasy-jaxrs@3.11.0.Final//org.jboss.resteasy.core.SynchronousDispatcher.lambda$invoke$4(SynchronousDispatcher.java:229)
          at org.jboss.resteasy.resteasy-jaxrs@3.11.0.Final//org.jboss.resteasy.core.SynchronousDispatcher.lambda$preprocess$0(SynchronousDispatcher.java:135)
          at org.jboss.resteasy.resteasy-jaxrs@3.11.0.Final//org.jboss.resteasy.core.interception.PreMatchContainerRequestContext.filter(PreMatchContainerRequestContext.java:356)
          at org.jboss.resteasy.resteasy-jaxrs@3.11.0.Final//org.jboss.resteasy.core.SynchronousDispatcher.preprocess(SynchronousDispatcher.java:138)
          at org.jboss.resteasy.resteasy-jaxrs@3.11.0.Final//org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:215)
          at org.jboss.resteasy.resteasy-jaxrs@3.11.0.Final//org.jboss.resteasy.plugins.server.servlet.ServletContainerDispatcher.service(ServletContainerDispatcher.java:227)
          at org.jboss.resteasy.resteasy-jaxrs@3.11.0.Final//org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.service(HttpServletDispatcher.java:56)
          at org.jboss.resteasy.resteasy-jaxrs@3.11.0.Final//org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.service(HttpServletDispatcher.java:51)
          at javax.servlet.api@2.0.0.Final//javax.servlet.http.HttpServlet.service(HttpServlet.java:590)
          at io.undertow.servlet@2.0.30.Final//io.undertow.servlet.handlers.ServletHandler.handleRequest(ServletHandler.java:74)
          at io.undertow.servlet@2.0.30.Final//io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:129)
          at org.keycloak.keycloak-services@10.0.0//org.keycloak.services.filters.KeycloakSessionServletFilter.doFilter(KeycloakSessionServletFilter.java:91)
          at io.undertow.servlet@2.0.30.Final//io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61)
          at io.undertow.servlet@2.0.30.Final//io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131)
          at io.undertow.servlet@2.0.30.Final//io.undertow.servlet.handlers.FilterHandler.handleRequest(FilterHandler.java:84)
          at io.undertow.servlet@2.0.30.Final//io.undertow.servlet.handlers.security.ServletSecurityRoleHandler.handleRequest(ServletSecurityRoleHandler.java:62)
          at io.undertow.servlet@2.0.30.Final//io.undertow.servlet.handlers.ServletChain$1.handleRequest(ServletChain.java:68)
          at io.undertow.servlet@2.0.30.Final//io.undertow.servlet.handlers.ServletDispatchingHandler.handleRequest(ServletDispatchingHandler.java:36)
          at org.wildfly.extension.undertow@19.0.0.Final//org.wildfly.extension.undertow.security.SecurityContextAssociationHandler.handleRequest(SecurityContextAssociationHandler.java:78)
          at io.undertow.core@2.0.30.Final//io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
          at io.undertow.servlet@2.0.30.Final//io.undertow.servlet.handlers.RedirectDirHandler.handleRequest(RedirectDirHandler.java:68)
          at io.undertow.servlet@2.0.30.Final//io.undertow.servlet.handlers.security.SSLInformationAssociationHandler.handleRequest(SSLInformationAssociationHandler.java:132)
          at io.undertow.servlet@2.0.30.Final//io.undertow.servlet.handlers.security.ServletAuthenticationCallHandler.handleRequest(ServletAuthenticationCallHandler.java:57)
          at io.undertow.core@2.0.30.Final//io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
          at io.undertow.core@2.0.30.Final//io.undertow.security.handlers.AbstractConfidentialityHandler.handleRequest(AbstractConfidentialityHandler.java:46)
          at io.undertow.servlet@2.0.30.Final//io.undertow.servlet.handlers.security.ServletConfidentialityConstraintHandler.handleRequest(ServletConfidentialityConstraintHandler.java:64)
          at io.undertow.core@2.0.30.Final//io.undertow.security.handlers.AuthenticationMechanismsHandler.handleRequest(AuthenticationMechanismsHandler.java:60)
          at io.undertow.servlet@2.0.30.Final//io.undertow.servlet.handlers.security.CachedAuthenticatedSessionHandler.handleRequest(CachedAuthenticatedSessionHandler.java:77)
          at io.undertow.core@2.0.30.Final//io.undertow.security.handlers.NotificationReceiverHandler.handleRequest(NotificationReceiverHandler.java:50)
          at io.undertow.core@2.0.30.Final//io.undertow.security.handlers.AbstractSecurityContextAssociationHandler.handleRequest(AbstractSecurityContextAssociationHandler.java:43)
          at io.undertow.core@2.0.30.Final//io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
          at org.wildfly.extension.undertow@19.0.0.Final//org.wildfly.extension.undertow.security.jacc.JACCContextIdHandler.handleRequest(JACCContextIdHandler.java:61)
          at io.undertow.core@2.0.30.Final//io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
          at org.wildfly.extension.undertow@19.0.0.Final//org.wildfly.extension.undertow.deployment.GlobalRequestControllerHandler.handleRequest(GlobalRequestControllerHandler.java:68)
          at io.undertow.core@2.0.30.Final//io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
          at io.undertow.servlet@2.0.30.Final//io.undertow.servlet.handlers.ServletInitialHandler.handleFirstRequest(ServletInitialHandler.java:269)
          at io.undertow.servlet@2.0.30.Final//io.undertow.servlet.handlers.ServletInitialHandler.access$100(ServletInitialHandler.java:78)
          at io.undertow.servlet@2.0.30.Final//io.undertow.servlet.handlers.ServletInitialHandler$2.call(ServletInitialHandler.java:133)
          at io.undertow.servlet@2.0.30.Final//io.undertow.servlet.handlers.ServletInitialHandler$2.call(ServletInitialHandler.java:130)
          at io.undertow.servlet@2.0.30.Final//io.undertow.servlet.core.ServletRequestContextThreadSetupAction$1.call(ServletRequestContextThreadSetupAction.java:48)
          at io.undertow.servlet@2.0.30.Final//io.undertow.servlet.core.ContextClassLoaderSetupAction$1.call(ContextClassLoaderSetupAction.java:43)
          at org.wildfly.extension.undertow@19.0.0.Final//org.wildfly.extension.undertow.security.SecurityContextThreadSetupAction.lambda$create$0(SecurityContextThreadSetupAction.java:105)
          at org.wildfly.extension.undertow@19.0.0.Final//org.wildfly.extension.undertow.deployment.UndertowDeploymentInfoService$UndertowThreadSetupAction.lambda$create$0(UndertowDeploymentInfoService.java:1541)
          at org.wildfly.extension.undertow@19.0.0.Final//org.wildfly.extension.undertow.deployment.UndertowDeploymentInfoService$UndertowThreadSetupAction.lambda$create$0(UndertowDeploymentInfoService.java:1541)
          at org.wildfly.extension.undertow@19.0.0.Final//org.wildfly.extension.undertow.deployment.UndertowDeploymentInfoService$UndertowThreadSetupAction.lambda$create$0(UndertowDeploymentInfoService.java:1541)
          at org.wildfly.extension.undertow@19.0.0.Final//org.wildfly.extension.undertow.deployment.UndertowDeploymentInfoService$UndertowThreadSetupAction.lambda$create$0(UndertowDeploymentInfoService.java:1541)
          at io.undertow.servlet@2.0.30.Final//io.undertow.servlet.handlers.ServletInitialHandler.dispatchRequest(ServletInitialHandler.java:249)
          at io.undertow.servlet@2.0.30.Final//io.undertow.servlet.handlers.ServletInitialHandler.access$000(ServletInitialHandler.java:78)
          at io.undertow.servlet@2.0.30.Final//io.undertow.servlet.handlers.ServletInitialHandler$1.handleRequest(ServletInitialHandler.java:99)
          at io.undertow.core@2.0.30.Final//io.undertow.server.Connectors.executeRootHandler(Connectors.java:376)
          at io.undertow.core@2.0.30.Final//io.undertow.server.HttpServerExchange$1.run(HttpServerExchange.java:830)
          at org.jboss.threads@2.3.3.Final//org.jboss.threads.ContextClassLoaderSavingRunnable.run(ContextClassLoaderSavingRunnable.java:35)
          at org.jboss.threads@2.3.3.Final//org.jboss.threads.EnhancedQueueExecutor.safeRun(EnhancedQueueExecutor.java:1982)
          at org.jboss.threads@2.3.3.Final//org.jboss.threads.EnhancedQueueExecutor$ThreadBody.doRunTask(EnhancedQueueExecutor.java:1486)
          at org.jboss.threads@2.3.3.Final//org.jboss.threads.EnhancedQueueExecutor$ThreadBody.run(EnhancedQueueExecutor.java:1377)
          at java.base/java.lang.Thread.run(Thread.java:834)
  </code></pre>