org.springframework.context.ApplicationContextException: Failed to start bean 'webServerStartStop'; nested exception is org.springframework.boot.web.server.WebServerException: Unable to start embedded Undertow
	at org.springframework.context.support.DefaultLifecycleProcessor.doStart(DefaultLifecycleProcessor.java:185)
	at org.springframework.context.support.DefaultLifecycleProcessor.access$200(DefaultLifecycleProcessor.java:53)
	at org.springframework.context.support.DefaultLifecycleProcessor$LifecycleGroup.start(DefaultLifecycleProcessor.java:360)
	at org.springframework.context.support.DefaultLifecycleProcessor.startBeans(DefaultLifecycleProcessor.java:158)
	at org.springframework.context.support.DefaultLifecycleProcessor.onRefresh(DefaultLifecycleProcessor.java:122)
	at org.springframework.context.support.AbstractApplicationContext.finishRefresh(AbstractApplicationContext.java:895)
	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:554)
	at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:143)
	at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:758)
	at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:750)
	at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397)
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:315)
	at com.emu.camunda.CamundaServerApp.main(CamundaServerApp.java:63)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.base/java.lang.reflect.Method.invoke(Method.java:566)
	at org.springframework.boot.devtools.restart.RestartLauncher.run(RestartLauncher.java:49)
Caused by: org.springframework.boot.web.server.WebServerException: Unable to start embedded Undertow
	at org.springframework.boot.web.embedded.undertow.UndertowWebServer.start(UndertowWebServer.java:144)
	at org.springframework.boot.web.servlet.context.WebServerStartStopLifecycle.start(WebServerStartStopLifecycle.java:43)
	at org.springframework.context.support.DefaultLifecycleProcessor.doStart(DefaultLifecycleProcessor.java:182)
	... 17 common frames omitted
Caused by: java.lang.RuntimeException: javax.servlet.ServletException: Cannot instantiate authentication filter: authentication provider not found
	at org.springframework.boot.web.embedded.undertow.DeploymentManagerHttpHandlerFactory$DeploymentManagerHandler.<init>(DeploymentManagerHttpHandlerFactory.java:69)
	at org.springframework.boot.web.embedded.undertow.DeploymentManagerHttpHandlerFactory.getHandler(DeploymentManagerHttpHandlerFactory.java:47)
	at org.springframework.boot.web.embedded.undertow.UndertowWebServer.createHttpHandler(UndertowWebServer.java:184)
	at org.springframework.boot.web.embedded.undertow.UndertowServletWebServer.createHttpHandler(UndertowServletWebServer.java:125)
	at org.springframework.boot.web.embedded.undertow.UndertowWebServer.createUndertowServer(UndertowWebServer.java:176)
	at org.springframework.boot.web.embedded.undertow.UndertowWebServer.start(UndertowWebServer.java:128)
	... 19 common frames omitted
Caused by: javax.servlet.ServletException: Cannot instantiate authentication filter: authentication provider not found
	at org.camunda.bpm.webapp.impl.security.auth.ContainerBasedAuthenticationFilter.init(ContainerBasedAuthenticationFilter.java:66)
	at io.undertow.servlet.core.LifecyleInterceptorInvocation.proceed(LifecyleInterceptorInvocation.java:111)
	at io.undertow.servlet.core.ManagedFilter.createFilter(ManagedFilter.java:80)
	at io.undertow.servlet.core.DeploymentManagerImpl$2.call(DeploymentManagerImpl.java:594)
	at io.undertow.servlet.core.DeploymentManagerImpl$2.call(DeploymentManagerImpl.java:559)
	at io.undertow.servlet.core.ServletRequestContextThreadSetupAction$1.call(ServletRequestContextThreadSetupAction.java:42)
	at io.undertow.servlet.core.ContextClassLoaderSetupAction$1.call(ContextClassLoaderSetupAction.java:43)
	at io.undertow.servlet.core.DeploymentManagerImpl.start(DeploymentManagerImpl.java:601)
	at org.springframework.boot.web.embedded.undertow.DeploymentManagerHttpHandlerFactory$DeploymentManagerHandler.<init>(DeploymentManagerHttpHandlerFactory.java:66)
	... 24 common frames omitted
Caused by: java.lang.ClassNotFoundException: org.camunda.bpm.extension.keycloak.showcase.sso.KeycloakAuthenticationProvider
	at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:581)
	at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:178)
	at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:521)
	at java.base/java.lang.Class.forName0(Native Method)
	at java.base/java.lang.Class.forName(Class.java:315)
	at org.camunda.bpm.webapp.impl.security.auth.ContainerBasedAuthenticationFilter.init(ContainerBasedAuthenticationFilter.java:63)
	... 32 common frames omitted