I am new to SAML2 and I was following the documentation and added the 
dependency in the pom.xml 

<dependency>
  <groupId>org.apereo.cas</groupId>
  <artifactId>cas-server-support-saml-idp</artifactId>
  <version>${cas.version}</version>
</dependency>

I also have this in the repositories,
 <repository>
        <id>shibboleth-releases</id>
        
<url>https://build.shibboleth.net/nexus/content/repositories/releases</url>
    </repository>


Then I have run Maven Rebuild command and the build was successful. Then when I 
try to redeploy in tomcat, I get the following
error:

2018-01-05 10:23:08,461 INFO 
[org.apereo.cas.configuration.config.CasCoreBootstrapStandaloneConfiguration] - 
<Configuration files found at [/etc/cas/config] are 
[[/etc/cas/config/application.yml, /etc/cas/config/cas.properties]]>
2018-01-05 10:23:08,536 INFO 
[org.apereo.cas.configuration.config.CasCoreBootstrapStandaloneConfiguration] - 
<Found and loaded [317] setting(s) from [/etc/cas/config]>
2018-01-05 10:23:08,537 INFO 
[org.springframework.cloud.bootstrap.config.PropertySourceBootstrapConfiguration]
 - <Located property source: PropertiesPropertySource 
{name='standaloneCasConfigService'}>
2018-01-05 10:23:08,726 INFO 
[org.apereo.cas.web.CasWebApplicationServletInitializer] - <The following 
profiles are active: standalone>
2018-01-05 10:23:12,536 WARN 
[org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext]
 - <Exception encountered during context initialization - cancelling refresh 
attempt: org.springframework.beans.factory.BeanCreationException: Error 
creating bean with name 'beanValidationPostProcessor' defined in class path 
resource [org/apereo/cas/config/CasCoreUtilConfiguration.class]: 
BeanPostProcessor before instantiation of bean failed; nested exception is 
org.springframework.beans.factory.UnsatisfiedDependencyException: Error 
creating bean with name 
'org.springframework.transaction.annotation.ProxyTransactionManagementConfiguration':
 Unsatisfied dependency expressed through method 'setConfigurers' parameter 0; 
nested exception is 
org.springframework.beans.factory.UnsatisfiedDependencyException: Error 
creating bean with name 'casCoreTicketsConfiguration': Unsatisfied dependency 
expressed through field 'casProperties'; nested exception is 
org.springframework.beans.factory.BeanCreationException: Error creating bean 
with name 'cas-org.apereo.cas.configuration.CasConfigurationProperties': Could 
not bind properties to CasConfigurationProperties (prefix=cas, 
ignoreInvalidFields=false, ignoreUnknownFields=true, 
ignoreNestedProperties=false); nested exception is 
org.springframework.beans.InvalidPropertyException: Invalid property 
'authn.samlIdp.authenticationContextClassMappings[0]' of bean class 
[org.apereo.cas.configuration.model.core.authentication.AuthenticationProperties]:
 Property referenced in indexed property path 
'authenticationContextClassMappings[0]' is neither an array nor a List nor a 
Map; returned value was [[]]>
2018-01-05 10:23:12,537 ERROR 
[org.springframework.beans.factory.support.DefaultListableBeanFactory] - 
<Destroy method on bean with name 
'org.springframework.context.annotation.internalScheduledAnnotationProcessor' 
threw an exception>
java.lang.IllegalStateException: ApplicationEventMulticaster not initialized - 
call 'refresh' before multicasting events via the context: 
org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@ad43569:
 startup date [Fri Jan 05 10:23:08 MYT 2018]; parent: 
org.springframework.context.annotation.AnnotationConfigApplicationContext@233a6337
        at 
org.springframework.context.support.AbstractApplicationContext.getApplicationEventMulticaster(AbstractApplicationContext.java:414)
 ~[spring-context-4.3.12.RELEASE.jar:4.3.12.RELEASE]
        at 
org.springframework.context.support.ApplicationListenerDetector.postProcessBeforeDestruction(ApplicationListenerDetector.java:97)
 ~[spring-context-4.3.12.RELEASE.jar:4.3.12.RELEASE]
        at 
org.springframework.beans.factory.support.DisposableBeanAdapter.destroy(DisposableBeanAdapter.java:253)
 ~[spring-beans-4.3.12.RELEASE.jar:4.3.12.RELEASE]
        at 
org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.destroyBean(DefaultSingletonBeanRegistry.java:578)
 ~[spring-beans-4.3.12.RELEASE.jar:4.3.12.RELEASE]
        at 
org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.destroySingleton(DefaultSingletonBeanRegistry.java:554)
 ~[spring-beans-4.3.12.RELEASE.jar:4.3.12.RELEASE]
        at 
org.springframework.beans.factory.support.DefaultListableBeanFactory.destroySingleton(DefaultListableBeanFactory.java:961)
 ~[spring-beans-4.3.12.RELEASE.jar:4.3.12.RELEASE]
        at 
org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.destroySingletons(DefaultSingletonBeanRegistry.java:523)
 ~[spring-beans-4.3.12.RELEASE.jar:4.3.12.RELEASE]
        at 
org.springframework.beans.factory.support.FactoryBeanRegistrySupport.destroySingletons(FactoryBeanRegistrySupport.java:230)
 ~[spring-beans-4.3.12.RELEASE.jar:4.3.12.RELEASE]
        at 
org.springframework.beans.factory.support.DefaultListableBeanFactory.destroySingletons(DefaultListableBeanFactory.java:968)
 ~[spring-beans-4.3.12.RELEASE.jar:4.3.12.RELEASE]
        at 
org.springframework.context.support.AbstractApplicationContext.destroyBeans(AbstractApplicationContext.java:1030)
 ~[spring-context-4.3.12.RELEASE.jar:4.3.12.RELEASE]
        at 
org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:556)
 ~[spring-context-4.3.12.RELEASE.jar:4.3.12.RELEASE]
        at 
org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:122)
 ~[spring-boot-1.5.8.RELEASE.jar:1.5.8.RELEASE]
        at 
org.springframework.boot.SpringApplication.refresh(SpringApplication.java:693) 
~[spring-boot-1.5.8.RELEASE.jar:1.5.8.RELEASE]
        at 
org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:360)
 ~[spring-boot-1.5.8.RELEASE.jar:1.5.8.RELEASE]
        at 
org.springframework.boot.SpringApplication.run(SpringApplication.java:303) 
~[spring-boot-1.5.8.RELEASE.jar:1.5.8.RELEASE]
        at 
org.springframework.boot.web.support.SpringBootServletInitializer.run(SpringBootServletInitializer.java:154)
 ~[spring-boot-1.5.8.RELEASE.jar:1.5.8.RELEASE]
        at 
org.springframework.boot.web.support.SpringBootServletInitializer.createRootApplicationContext(SpringBootServletInitializer.java:134)
 ~[spring-boot-1.5.8.RELEASE.jar:1.5.8.RELEASE]
        at 
org.springframework.boot.web.support.SpringBootServletInitializer.onStartup(SpringBootServletInitializer.java:87)
 ~[spring-boot-1.5.8.RELEASE.jar:1.5.8.RELEASE]
        at 
org.springframework.web.SpringServletContainerInitializer.onStartup(SpringServletContainerInitializer.java:169)
 ~[spring-web-4.3.12.RELEASE.jar:4.3.12.RELEASE]
        at 
org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5244)
 ~[tomcat8-catalina-8.0.32.jar:8.0.32]
        at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:147) 
~[tomcat8-catalina-8.0.32.jar:8.0.32]
        at 
org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:725) 
~[tomcat8-catalina-8.0.32.jar:8.0.32]
        at 
org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:701) 
~[tomcat8-catalina-8.0.32.jar:8.0.32]
        at 
org.apache.catalina.core.StandardHost.addChild(StandardHost.java:717) 
~[tomcat8-catalina-8.0.32.jar:8.0.32]
        at 
org.apache.catalina.startup.HostConfig.deployWAR(HostConfig.java:939) 
~[tomcat8-catalina-8.0.32.jar:8.0.32]
        at 
org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:465) 
~[tomcat8-catalina-8.0.32.jar:8.0.32]
        at org.apache.catalina.startup.HostConfig.check(HostConfig.java:1608) 
~[tomcat8-catalina-8.0.32.jar:8.0.32]
        at sun.reflect.GeneratedMethodAccessor1713.invoke(Unknown Source) ~[?:?]
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
 ~[?:1.8.0_151]
        at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_151]
        at 
org.apache.tomcat.util.modeler.BaseModelMBean.invoke(BaseModelMBean.java:300) 
~[tomcat8-coyote-8.0.32.jar:8.0.32]
        at 
com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:819)
 ~[?:1.8.0_151]
        at 
com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:801) 
~[?:1.8.0_151]
        at 
org.apache.catalina.manager.ManagerServlet.check(ManagerServlet.java:1460) 
~[tomcat8-catalina-8.0.32.jar:8.0.32]
        at 
org.apache.catalina.manager.ManagerServlet.deploy(ManagerServlet.java:906) 
~[tomcat8-catalina-8.0.32.jar:8.0.32]
        at 
org.apache.catalina.manager.HTMLManagerServlet.deployInternal(HTMLManagerServlet.java:315)
 ~[tomcat8-catalina-8.0.32.jar:8.0.32]
        at 
org.apache.catalina.manager.HTMLManagerServlet.doPost(HTMLManagerServlet.java:208)
 ~[tomcat8-catalina-8.0.32.jar:8.0.32]
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:648) 
~[servlet-api-3.1.jar:?]
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:729) 
~[servlet-api-3.1.jar:?]
        at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:292)
 ~[tomcat8-catalina-8.0.32.jar:8.0.32]
        at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
 ~[tomcat8-catalina-8.0.32.jar:8.0.32]
        at 
org.apache.catalina.filters.CsrfPreventionFilter.doFilter(CsrfPreventionFilter.java:136)
 ~[tomcat8-catalina-8.0.32.jar:8.0.32]
        at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240)
 ~[tomcat8-catalina-8.0.32.jar:8.0.32]
        at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
 ~[tomcat8-catalina-8.0.32.jar:8.0.32]
        at 
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) 
~[tomcat8-websocket-8.0.32.jar:8.0.32]
        at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240)
 ~[tomcat8-catalina-8.0.32.jar:8.0.32]
        at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
 ~[tomcat8-catalina-8.0.32.jar:8.0.32]
        at 
org.apache.catalina.filters.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:108)
 ~[tomcat8-catalina-8.0.32.jar:8.0.32]
        at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240)
 ~[tomcat8-catalina-8.0.32.jar:8.0.32]
        at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
 ~[tomcat8-catalina-8.0.32.jar:8.0.32]
        at 
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
 ~[tomcat8-catalina-8.0.32.jar:8.0.32]
        at 
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106)
 ~[tomcat8-catalina-8.0.32.jar:8.0.32]
        at 
org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:614)
 ~[tomcat8-catalina-8.0.32.jar:8.0.32]
        at 
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:141) 
~[tomcat8-catalina-8.0.32.jar:8.0.32]
        at 
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79) 
~[tomcat8-catalina-8.0.32.jar:8.0.32]
        at 
org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:616)
 ~[tomcat8-catalina-8.0.32.jar:8.0.32]
        at 
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)
 ~[tomcat8-catalina-8.0.32.jar:8.0.32]
        at 
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:522) 
~[tomcat8-catalina-8.0.32.jar:8.0.32]
        at 
org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1095)
 ~[tomcat8-coyote-8.0.32.jar:8.0.32]
        at 
org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:672)
 ~[tomcat8-coyote-8.0.32.jar:8.0.32]
        at 
org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1504)
 ~[tomcat8-coyote-8.0.32.jar:8.0.32]
        at 
org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1460)
 ~[tomcat8-coyote-8.0.32.jar:8.0.32]
        at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) 
~[?:1.8.0_151]
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) 
~[?:1.8.0_151]
        at 
org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
 ~[tomcat8-util-8.0.32.jar:8.0.32]
        at java.lang.Thread.run(Thread.java:748) [?:1.8.0_151]
2018-01-05 10:23:12,537 ERROR 
[org.springframework.beans.factory.support.DefaultListableBeanFactory] - 
<Destroy method on bean with name 
'org.springframework.boot.context.properties.ConfigurationPropertiesBindingPostProcessor'
 threw an exception>
java.lang.IllegalStateException: ApplicationEventMulticaster not initialized - 
call 'refresh' before multicasting events via the context: 
org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@ad43569:
 startup date [Fri Jan 05 10:23:08 MYT 2018]; parent: 
org.springframework.context.annotation.AnnotationConfigApplicationContext@233a6337
        at 
org.springframework.context.support.AbstractApplicationContext.getApplicationEventMulticaster(AbstractApplicationContext.java:414)
 ~[spring-context-4.3.12.RELEASE.jar:4.3.12.RELEASE]
        at 
org.springframework.context.support.ApplicationListenerDetector.postProcessBeforeDestruction(ApplicationListenerDetector.java:97)
 ~[spring-context-4.3.12.RELEASE.jar:4.3.12.RELEASE]
        at 
org.springframework.beans.factory.support.DisposableBeanAdapter.destroy(DisposableBeanAdapter.java:253)
 ~[spring-beans-4.3.12.RELEASE.jar:4.3.12.RELEASE]
        at 
org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.destroyBean(DefaultSingletonBeanRegistry.java:578)
 ~[spring-beans-4.3.12.RELEASE.jar:4.3.12.RELEASE]
        at 
org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.destroySingleton(DefaultSingletonBeanRegistry.java:554)
 ~[spring-beans-4.3.12.RELEASE.jar:4.3.12.RELEASE]
        at 
org.springframework.beans.factory.support.DefaultListableBeanFactory.destroySingleton(DefaultListableBeanFactory.java:961)
 ~[spring-beans-4.3.12.RELEASE.jar:4.3.12.RELEASE]
        at 
org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.destroySingletons(DefaultSingletonBeanRegistry.java:523)
 ~[spring-beans-4.3.12.RELEASE.jar:4.3.12.RELEASE]
        at 
org.springframework.beans.factory.support.FactoryBeanRegistrySupport.destroySingletons(FactoryBeanRegistrySupport.java:230)
 ~[spring-beans-4.3.12.RELEASE.jar:4.3.12.RELEASE]
        at 
org.springframework.beans.factory.support.DefaultListableBeanFactory.destroySingletons(DefaultListableBeanFactory.java:968)
 ~[spring-beans-4.3.12.RELEASE.jar:4.3.12.RELEASE]
        at 
org.springframework.context.support.AbstractApplicationContext.destroyBeans(AbstractApplicationContext.java:1030)
 ~[spring-context-4.3.12.RELEASE.jar:4.3.12.RELEASE]
        at 
org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:556)
 ~[spring-context-4.3.12.RELEASE.jar:4.3.12.RELEASE]
        at 
org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:122)
 ~[spring-boot-1.5.8.RELEASE.jar:1.5.8.RELEASE]
        at 
org.springframework.boot.SpringApplication.refresh(SpringApplication.java:693) 
~[spring-boot-1.5.8.RELEASE.jar:1.5.8.RELEASE]
        at 
org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:360)
 ~[spring-boot-1.5.8.RELEASE.jar:1.5.8.RELEASE]
        at 
org.springframework.boot.SpringApplication.run(SpringApplication.java:303) 
~[spring-boot-1.5.8.RELEASE.jar:1.5.8.RELEASE]
        at 
org.springframework.boot.web.support.SpringBootServletInitializer.run(SpringBootServletInitializer.java:154)
 ~[spring-boot-1.5.8.RELEASE.jar:1.5.8.RELEASE]
        at 
org.springframework.boot.web.support.SpringBootServletInitializer.createRootApplicationContext(SpringBootServletInitializer.java:134)
 ~[spring-boot-1.5.8.RELEASE.jar:1.5.8.RELEASE]
        at 
org.springframework.boot.web.support.SpringBootServletInitializer.onStartup(SpringBootServletInitializer.java:87)
 ~[spring-boot-1.5.8.RELEASE.jar:1.5.8.RELEASE]
        at 
org.springframework.web.SpringServletContainerInitializer.onStartup(SpringServletContainerInitializer.java:169)
 ~[spring-web-4.3.12.RELEASE.jar:4.3.12.RELEASE]



I tried adding these in the cas.properties:


cas.authn.samlIdp.entityId=http://localhost:8080/cas/idp
cas.authn.samlIdp.scope=localhost:8080
cas.authn.samlIdp.authenticationContextClassMappings[0]=urn:oasis:names:tc:SAML:2.0:ac:classes:SomeClassName->mfa-duo
cas.authn.samlIdp.metadata.cacheExpirationMinutes=30
cas.authn.samlIdp.metadata.failFast=true
cas.authn.samlIdp.metadata.location=file:/etc/cas/saml
cas.authn.samlIdp.metadata.privateKeyAlgName=RSA
cas.authn.samlIdp.metadata.requireValidMetadata=true
# cas.authn.samlIdp.metadata.basicAuthnUsername=
# cas.authn.samlIdp.metadata.basicAuthnPassword=
# cas.authn.samlIdp.metadata.supportedContentTypes=
cas.authn.samlIdp.attributeQueryProfileEnabled=true
cas.authn.samlIdp.logout.forceSignedLogoutRequests=true
cas.authn.samlIdp.logout.singleLogoutCallbacksDisabled=false
# cas.authn.samlIdp.response.defaultAuthenticationContextClass=
cas.authn.samlIdp.response.defaultAttributeNameFormat=uri
cas.authn.samlIdp.response.signError=false
cas.authn.samlIdp.response.signingCredentialType=X509|BASIC
cas.authn.samlIdp.response.useAttributeFriendlyName=true
cas.authn.samlIdp.response.attributeNameFormats=attributeName->basic|uri|unspecified|custom-format-etc,...



Still have the same error. 

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