I use Metron-0.4.3 with an Ambari Cluster, but when I start Metron-Rest, the log shows: 18/03/25 22:19:51 INFO context.ContextLoader: Root WebApplicationContext: initialization completed in 6871 ms 18/03/25 22:19:52 INFO servlet.FilterRegistrationBean: Mapping filter: 'characterEncodingFilter' to: [/*] 18/03/25 22:19:52 INFO servlet.FilterRegistrationBean: Mapping filter: 'hiddenHttpMethodFilter' to: [/*] 18/03/25 22:19:52 INFO servlet.FilterRegistrationBean: Mapping filter: 'httpPutFormContentFilter' to: [/*] 18/03/25 22:19:52 INFO servlet.FilterRegistrationBean: Mapping filter: 'requestContextFilter' to: [/*] 18/03/25 22:19:52 INFO servlet.DelegatingFilterProxyRegistrationBean: Mapping filter: 'springSecurityFilterChain' to: [/*] 18/03/25 22:19:52 INFO servlet.ServletRegistrationBean: Mapping servlet: 'dispatcherServlet' to [/] 18/03/25 22:20:04 INFO jpa.LocalContainerEntityManagerFactoryBean: Building JPA container EntityManagerFactory for persistence unit 'default' 18/03/25 22:20:05 INFO jpa.LocalContainerEntityManagerFactoryBean: Initialized JPA EntityManagerFactory for persistence unit 'default' 18/03/25 22:20:06 WARN embedded.AnnotationConfigEmbeddedWebApplicationContext: Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'sensorIndexingConfigServiceImpl' defined in URL [jar:file:/usr/metron/0.4.3/lib/metron-rest-0.4.3.jar!/org/apache/metron/rest/service/impl/SensorIndexingConfigServiceImpl.class]: Unsatisfied dependency expressed through constructor parameter 1; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'client' defined in class path resource [org/apache/metron/rest/config/ZookeeperConfig.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.apache.curator.framework.CuratorFramework]: Factory method 'client' threw exception; nested exception is java.lang.NullPointerException: connectionString cannot be null 18/03/25 22:20:06 INFO jpa.LocalContainerEntityManagerFactoryBean: Closing JPA EntityManagerFactory for persistence unit 'default' Mar 25, 2018 10:20:06 PM org.apache.catalina.core.StandardService stopInternal INFO: Stopping service Tomcat Mar 25, 2018 10:20:06 PM org.apache.catalina.loader.WebappClassLoaderBase clearReferencesThreads WARNING: The web application [ROOT] appears to have started a thread named [Abandoned connection cleanup thread] but has failed to stop it. This is very likely to create a memory leak. Stack trace of thread: 18/03/25 22:20:06 WARN boot.SpringApplication: Error handling failed (Error creating bean with name 'delegatingApplicationListener' defined in class path resource [org/springframework/security/config/annotation/web/configuration/WebSecurityConfiguration.class]: BeanPostProcessor before instantiation of bean failed; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'metaDataSourceAdvisor': Cannot resolve reference to bean 'methodSecurityMetadataSource' while setting constructor argument; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'org.springframework.security.config.annotation.method.configuration.GlobalMethodSecurityConfiguration': Initialization of bean failed; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No bean named 'org.springframework.context.annotation.ConfigurationClassPostProcessor.importRegistry' is defined) 18/03/25 22:20:06 ERROR boot.SpringApplication: Application startup failed org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'sensorIndexingConfigServiceImpl' defined in URL [jar:file:/usr/metron/0.4.3/lib/metron-rest-0.4.3.jar!/org/apache/metron/rest/service/impl/SensorIndexingConfigServiceImpl.class]: Unsatisfied dependency expressed through constructor parameter 1; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'client' defined in class path resource [org/apache/metron/rest/config/ZookeeperConfig.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.apache.curator.framework.CuratorFramework]: Factory method 'client' threw exception; nested exception is java.lang.NullPointerException: connectionString cannot be null at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:749) at org.springframework.beans.factory.support.ConstructorResolver.autowireConstructor(ConstructorResolver.java:189) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.autowireConstructor(AbstractAutowireCapableBeanFactory.java:1148) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1051) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:510) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:482) at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306) at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230) at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302) at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197) at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:751) at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:861) at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:541) at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:122) at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:761) at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:371) at org.springframework.boot.SpringApplication.run(SpringApplication.java:315) at org.springframework.boot.SpringApplication.run(SpringApplication.java:1186) at org.springframework.boot.SpringApplication.run(SpringApplication.java:1175) at org.apache.metron.rest.MetronRestApplication.main(MetronRestApplication.java:29) Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'client' defined in class path resource [org/apache/metron/rest/config/ZookeeperConfig.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.apache.curator.framework.CuratorFramework]: Factory method 'client' threw exception; nested exception is java.lang.NullPointerException: connectionString cannot be null at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:599) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1128) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1023) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:510) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:482) at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306) at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230) at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302) at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202) at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:207) at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1128) at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1056) at org.springframework.beans.factory.support.ConstructorResolver.resolveAutowiredArgument(ConstructorResolver.java:835) at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:741) ... 19 more Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.apache.curator.framework.CuratorFramework]: Factory method 'client' threw exception; nested exception is java.lang.NullPointerException: connectionString cannot be null at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:189) at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:588) ... 32 more Caused by: java.lang.NullPointerException: connectionString cannot be null at org.apache.metron.guava.base.Preconditions.checkNotNull(Preconditions.java:229) at org.apache.curator.ensemble.fixed.FixedEnsembleProvider.<init>(FixedEnsembleProvider.java:39) at org.apache.curator.framework.CuratorFrameworkFactory$Builder.connectString(CuratorFrameworkFactory.java:193) at org.apache.curator.framework.CuratorFrameworkFactory.newClient(CuratorFrameworkFactory.java:94) at org.apache.curator.framework.CuratorFrameworkFactory.newClient(CuratorFrameworkFactory.java:79) at org.apache.metron.rest.config.ZookeeperConfig.client(ZookeeperConfig.java:55) at org.apache.metron.rest.config.ZookeeperConfig$EnhancerBySpringCGLIB$f3f9596e.CGLIB$client$0(<generated>) at org.apache.metron.rest.config.ZookeeperConfig$EnhancerBySpringCGLIB$f3f9596e$FastClassBySpringCGLIB$b1301973.invoke(<generated>) at org.springframework.cglib.proxy.MethodProxy.invokeSuper(MethodProxy.java:228) at org.springframework.context.annotation.ConfigurationClassEnhancer$BeanMethodInterceptor.intercept(ConfigurationClassEnhancer.java:356) at org.apache.metron.rest.config.ZookeeperConfig$EnhancerBySpringCGLIB$f3f9596e.client(<generated>) 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.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:162) ... 33 more Who can help me? 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