when I run the command service cloudera-scm-server start Shows failed  Urgent help needed  as I have stuck with issue since last 2 days   org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:895)         at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:425)         at com.cloudera.server.cmf.Main.bootstrapSpringContext(Main.java:392)         at com.cloudera.server.cmf.Main.<init>(Main.java:242)         at com.cloudera.server.cmf.Main.main(Main.java:216) Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'entityManagerFactoryBean': FactoryBean threw exception on object creation; nested exception is javax.persistence.PersistenceException: [PersistenceUnit: cmf.server] Unable to build EntityManagerFactory         at org.springframework.beans.factory.support.FactoryBeanRegistrySupport.doGetObjectFromFactoryBean(FactoryBeanRegistrySupport.java:149)         at org.springframework.beans.factory.support.FactoryBeanRegistrySupport.getObjectFromFactoryBean(FactoryBeanRegistrySupport.java:102)         at org.springframework.beans.factory.support.AbstractBeanFactory.getObjectForBeanInstance(AbstractBeanFactory.java:1440)         at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:247)         at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:192)         at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveReference(BeanDefinitionValueResolver.java:322)         ... 17 more Caused by: javax.persistence.PersistenceException: [PersistenceUnit: cmf.server] Unable to build EntityManagerFactory         at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:924)         at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:899)         at org.hibernate.ejb.HibernatePersistence.createEntityManagerFactory(HibernatePersistence.java:59)         at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:63)         at com.cloudera.enterprise.CommonMain.setupHibernate(CommonMain.java:183)         at com.cloudera.server.cmf.bootstrap.EntityManagerFactoryBean.getObject(EntityManagerFactoryBean.java:114)         at com.cloudera.server.cmf.bootstrap.EntityManagerFactoryBean.getObject(EntityManagerFactoryBean.java:65)         at org.springframework.beans.factory.support.FactoryBeanRegistrySupport.doGetObjectFromFactoryBean(FactoryBeanRegistrySupport.java:142)         ... 22 more             tail -n50 /var/log/cloudera-scm-server/cloudera-scm-server.out         at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:895)         at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:425)         at com.cloudera.server.cmf.Main.bootstrapSpringContext(Main.java:392)         at com.cloudera.server.cmf.Main.<init>(Main.java:242)         at com.cloudera.server.cmf.Main.main(Main.java:216) Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'entityManagerFactoryBean': FactoryBean threw exception on object creation; nested exception is javax.persistence.PersistenceException: [PersistenceUnit: cmf.server] Unable to build EntityManagerFactory         at org.springframework.beans.factory.support.FactoryBeanRegistrySupport.doGetObjectFromFactoryBean(FactoryBeanRegistrySupport.java:149)         at org.springframework.beans.factory.support.FactoryBeanRegistrySupport.getObjectFromFactoryBean(FactoryBeanRegistrySupport.java:102)         at org.springframework.beans.factory.support.AbstractBeanFactory.getObjectForBeanInstance(AbstractBeanFactory.java:1440)         at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:247)         at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:192)         at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveReference(BeanDefinitionValueResolver.java:322)         ... 17 more Caused by: javax.persistence.PersistenceException: [PersistenceUnit: cmf.server] Unable to build EntityManagerFactory         at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:924)         at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:899)         at org.hibernate.ejb.HibernatePersistence.createEntityManagerFactory(HibernatePersistence.java:59)         at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:63)         at com.cloudera.enterprise.CommonMain.setupHibernate(CommonMain.java:183)         at com.cloudera.server.cmf.bootstrap.EntityManagerFactoryBean.getObject(EntityManagerFactoryBean.java:114)         at com.cloudera.server.cmf.bootstrap.EntityManagerFactoryBean.getObject(EntityManagerFactoryBean.java:65)         at org.springframework.beans.factory.support.FactoryBeanRegistrySupport.doGetObjectFromFactoryBean(FactoryBeanRegistrySupport.java:142)         ... 22 more Caused by: org.hibernate.service.classloading.spi.ClassLoadingException: HHH010003: JDBC Driver class not found: com.mysql.jdbc.Driver         at org.hibernate.service.jdbc.connections.internal.C3P0ConnectionProvider.configure(C3P0ConnectionProvider.java:142)         at org.hibernate.service.internal.StandardServiceRegistryImpl.configureService(StandardServiceRegistryImpl.java:75)         at org.hibernate.service.internal.AbstractServiceRegistryImpl.initializeService(AbstractServiceRegistryImpl.java:159)         at org.hibernate.service.internal.AbstractServiceRegistryImpl.getService(AbstractServiceRegistryImpl.java:131)         at org.hibernate.engine.jdbc.internal.JdbcServicesImpl.buildJdbcConnectionAccess(JdbcServicesImpl.java:223)         at org.hibernate.engine.jdbc.internal.JdbcServicesImpl.configure(JdbcServicesImpl.java:89)         at org.hibernate.service.internal.StandardServiceRegistryImpl.configureService(StandardServiceRegistryImpl.java:75)         at org.hibernate.service.internal.AbstractServiceRegistryImpl.initializeService(AbstractServiceRegistryImpl.java:159)         at org.hibernate.service.internal.AbstractServiceRegistryImpl.getService(AbstractServiceRegistryImpl.java:131)         at org.hibernate.cfg.Configuration.buildTypeRegistrations(Configuration.java:1797)         at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1755)         at org.hibernate.ejb.EntityManagerFactoryImpl.<init>(EntityManagerFactoryImpl.java:96)         at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:914)         ... 29 more Caused by: org.hibernate.service.classloading.spi.ClassLoadingException: Unable to load class [com.mysql.jdbc.Driver]         at org.hibernate.service.classloading.internal.ClassLoaderServiceImpl.classForName(ClassLoaderServiceImpl.java:149)         at org.hibernate.service.jdbc.connections.internal.C3P0ConnectionProvider.configure(C3P0ConnectionProvider.java:139)         ... 41 more Caused by: java.lang.ClassNotFoundException: Could not load requested class : com.mysql.jdbc.Driver         at org.hibernate.service.classloading.internal.ClassLoaderServiceImpl$AggregatedClassLoader.findClass(ClassLoaderServiceImpl.java:296)         at java.lang.ClassLoader.loadClass(ClassLoader.java:424)         at java.lang.ClassLoader.loadClass(ClassLoader.java:357)         at java.lang.Class.forName0(Native Method)         at java.lang.Class.forName(Class.java:348)         at org.hibernate.service.classloading.internal.ClassLoaderServiceImpl.classForName(ClassLoaderServiceImpl.java:146)         ... 42 more ... View more