I am new to this. i've tried installing ambari and on the first try, i was able to start the ambari-server. but when i tried again, an error occurred. Using python /usr/bin/python Starting ambari-server Ambari Server running with administrator privileges. Organizing resource files at /var/lib/ambari-server/resources... Ambari database consistency check started... Server PID at: /var/run/ambari-server/ambari-server.pid Server out at: /var/log/ambari-server/ambari-server.out Server log at: /var/log/ambari-server/ambari-server.log Waiting for server start.........Unable to determine server PID. Retrying... ......Unable to determine server PID. Retrying... ......Unable to determine server PID. Retrying... ERROR: Exiting with exit code -1. REASON: Ambari Server java process died with exitcode 255. the /var/log/ambari-server/ambari-server.out gave me: Java HotSpot(TM) 64-Bit Server VM warning: ignoring option MaxPermSize=128m; support was removed in 8.0 Jul 10, 2019 10:02:23 PM com.google.inject.assistedinject.FactoryProvider2 isValidForOptimizedAssistedInject WARNING: AssistedInject factory org.apache.ambari.server.state.cluster.ClusterFactory will be slow because class org.apache.ambari.server.state.cluster.ClusterImpl has assisted Provider dependencies or injects the Injector. Stop injecting @Assisted Provider<T> (instead use @Assisted T) or Injector to speed things up. (It will be a ~6500% speed bump!) The exact offending deps are: [Key[type=com.google.inject.Injector, annotation=[none]]@org.apache.ambari.server.state.cluster.ClusterImpl.<init>()[1]] Jul 10, 2019 10:02:24 PM com.google.inject.assistedinject.FactoryProvider2 isValidForOptimizedAssistedInject WARNING: AssistedInject factory org.apache.ambari.server.controller.ResourceProviderFactory will be slow because class org.apache.ambari.server.controller.internal.HostComponentResourceProvider has assisted Provider dependencies or injects the Injector. Stop injecting @Assisted Provider<T> (instead use @Assisted T) or Injector to speed things up. (It will be a ~6500% speed bump!) The exact offending deps are: [Key[type=com.google.inject.Injector, annotation=[none]]@org.apache.ambari.server.controller.internal.HostComponentResourceProvider.<init>()[1]] Jul 10, 2019 10:02:24 PM com.google.inject.assistedinject.FactoryProvider2 isValidForOptimizedAssistedInject WARNING: AssistedInject factory org.apache.ambari.server.state.scheduler.RequestExecutionFactory will be slow because class org.apache.ambari.server.state.scheduler.RequestExecutionImpl has assisted Provider dependencies or injects the Injector. Stop injecting @Assisted Provider<T> (instead use @Assisted T) or Injector to speed things up. (It will be a ~6500% speed bump!) The exact offending deps are: [Key[type=com.google.inject.Injector, annotation=[none]]@org.apache.ambari.server.state.scheduler.RequestExecutionImpl.<init>()[2]] Jul 10, 2019 10:02:24 PM com.google.inject.assistedinject.FactoryProvider2 isValidForOptimizedAssistedInject WARNING: AssistedInject factory org.apache.ambari.server.state.scheduler.RequestExecutionFactory will be slow because class org.apache.ambari.server.state.scheduler.RequestExecutionImpl has assisted Provider dependencies or injects the Injector. Stop injecting @Assisted Provider<T> (instead use @Assisted T) or Injector to speed things up. (It will be a ~6500% speed bump!) The exact offending deps are: [Key[type=com.google.inject.Injector, annotation=[none]]@org.apache.ambari.server.state.scheduler.RequestExecutionImpl.<init>()[3]] Jul 10, 2019 10:02:25 PM com.google.inject.internal.ProxyFactory <init> WARNING: Method [public void org.apache.ambari.server.orm.dao.RepositoryVersionDAO.create(java.lang.Object)] is synthetic and is being intercepted by [org.apache.ambari.server.orm.AmbariJpaLocalTxnInterceptor@5f172d4a]. This could indicate a bug. The method may be intercepted twice, or may not be intercepted at all. Jul 10, 2019 10:02:26 PM com.google.inject.internal.ProxyFactory <init> WARNING: Method [public void org.apache.ambari.server.orm.dao.AmbariConfigurationDAO.create(java.lang.Object)] is synthetic and is being intercepted by [org.apache.ambari.server.orm.AmbariJpaLocalTxnInterceptor@5f172d4a]. This could indicate a bug. The method may be intercepted twice, or may not be intercepted at all. Jul 10, 2019 10:02:26 PM com.google.inject.internal.ProxyFactory <init> WARNING: Method [public void org.apache.ambari.server.orm.dao.HostVersionDAO.create(java.lang.Object)] is synthetic and is being intercepted by [org.apache.ambari.server.orm.AmbariJpaLocalTxnInterceptor@5f172d4a]. This could indicate a bug. The method may be intercepted twice, or may not be intercepted at all. Jul 10, 2019 10:02:26 PM com.google.inject.internal.ProxyFactory <init> WARNING: Method [public java.lang.Object org.apache.ambari.server.topology.tasks.ConfigureClusterTask.call() throws java.lang.Exception] is synthetic and is being intercepted by [org.apache.ambari.server.security.authorization.internal.InternalAuthenticationInterceptor@44a085e5]. This could indicate a bug. The method may be intercepted twice, or may not be intercepted at all. Jul 10, 2019 10:02:27 PM org.postgresql.core.v3.ConnectionFactoryImpl log WARNING: IOException occurred while connecting to ambari:5432 java.net.UnknownHostException: ambari at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:184) at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392) at java.net.Socket.connect(Socket.java:589) at org.postgresql.core.PGStream.<init>(PGStream.java:69) at org.postgresql.core.v3.ConnectionFactoryImpl.openConnectionImpl(ConnectionFactoryImpl.java:156) at org.postgresql.core.ConnectionFactory.openConnection(ConnectionFactory.java:49) at org.postgresql.jdbc.PgConnection.<init>(PgConnection.java:195) at org.postgresql.Driver.makeConnection(Driver.java:452) at org.postgresql.Driver.connect(Driver.java:254) at java.sql.DriverManager.getConnection(DriverManager.java:664) at java.sql.DriverManager.getConnection(DriverManager.java:208) at org.eclipse.persistence.sessions.DefaultConnector.connect(DefaultConnector.java:98) at org.eclipse.persistence.sessions.DatasourceLogin.connectToDatasource(DatasourceLogin.java:162) at org.eclipse.persistence.internal.sessions.DatabaseSessionImpl.setOrDetectDatasource(DatabaseSessionImpl.java:207) at org.eclipse.persistence.internal.sessions.DatabaseSessionImpl.loginAndDetectDatasource(DatabaseSessionImpl.java:760) at org.eclipse.persistence.internal.jpa.EntityManagerFactoryProvider.login(EntityManagerFactoryProvider.java:265) at org.eclipse.persistence.internal.jpa.EntityManagerSetupImpl.deploy(EntityManagerSetupImpl.java:731) at org.eclipse.persistence.internal.jpa.EntityManagerFactoryDelegate.getAbstractSession(EntityManagerFactoryDelegate.java:205) at org.eclipse.persistence.internal.jpa.EntityManagerFactoryDelegate.createEntityManagerImpl(EntityManagerFactoryDelegate.java:305) at org.eclipse.persistence.internal.jpa.EntityManagerFactoryImpl.createEntityManagerImpl(EntityManagerFactoryImpl.java:337) at org.eclipse.persistence.internal.jpa.EntityManagerFactoryImpl.createEntityManager(EntityManagerFactoryImpl.java:303) at com.google.inject.persist.jpa.JpaPersistService.begin(JpaPersistService.java:77) at com.google.inject.persist.jpa.AmbariJpaPersistService.begin(AmbariJpaPersistService.java:28) at org.apache.ambari.server.orm.AmbariLocalSessionInterceptor.invoke(AmbariLocalSessionInterceptor.java:40) at com.google.inject.internal.InterceptorStackCallback$InterceptedMethodInvocation.proceed(InterceptorStackCallback.java:77) at com.google.inject.internal.InterceptorStackCallback.intercept(InterceptorStackCallback.java:55) at org.apache.ambari.server.orm.dao.MetainfoDAO$$EnhancerByGuice$$6c95db51.findByKey(<generated>) at org.apache.ambari.server.checks.DatabaseConsistencyCheckHelper.checkDBVersionCompatible(DatabaseConsistencyCheckHelper.java:222) at org.apache.ambari.server.controller.AmbariServer.main(AmbariServer.java:1099) Jul 10, 2019 10:02:27 PM org.postgresql.Driver connect SEVERE: Connection error: org.postgresql.util.PSQLException: The connection attempt failed. at org.postgresql.core.v3.ConnectionFactoryImpl.openConnectionImpl(ConnectionFactoryImpl.java:257) at org.postgresql.core.ConnectionFactory.openConnection(ConnectionFactory.java:49) at org.postgresql.jdbc.PgConnection.<init>(PgConnection.java:195) at org.postgresql.Driver.makeConnection(Driver.java:452) at org.postgresql.Driver.connect(Driver.java:254) at java.sql.DriverManager.getConnection(DriverManager.java:664) at java.sql.DriverManager.getConnection(DriverManager.java:208) at org.eclipse.persistence.sessions.DefaultConnector.connect(DefaultConnector.java:98) at org.eclipse.persistence.sessions.DatasourceLogin.connectToDatasource(DatasourceLogin.java:162) at org.eclipse.persistence.internal.sessions.DatabaseSessionImpl.setOrDetectDatasource(DatabaseSessionImpl.java:207) at org.eclipse.persistence.internal.sessions.DatabaseSessionImpl.loginAndDetectDatasource(DatabaseSessionImpl.java:760) at org.eclipse.persistence.internal.jpa.EntityManagerFactoryProvider.login(EntityManagerFactoryProvider.java:265) at org.eclipse.persistence.internal.jpa.EntityManagerSetupImpl.deploy(EntityManagerSetupImpl.java:731) at org.eclipse.persistence.internal.jpa.EntityManagerFactoryDelegate.getAbstractSession(EntityManagerFactoryDelegate.java:205) at org.eclipse.persistence.internal.jpa.EntityManagerFactoryDelegate.createEntityManagerImpl(EntityManagerFactoryDelegate.java:305) at org.eclipse.persistence.internal.jpa.EntityManagerFactoryImpl.createEntityManagerImpl(EntityManagerFactoryImpl.java:337) at org.eclipse.persistence.internal.jpa.EntityManagerFactoryImpl.createEntityManager(EntityManagerFactoryImpl.java:303) at com.google.inject.persist.jpa.JpaPersistService.begin(JpaPersistService.java:77) at com.google.inject.persist.jpa.AmbariJpaPersistService.begin(AmbariJpaPersistService.java:28) at org.apache.ambari.server.orm.AmbariLocalSessionInterceptor.invoke(AmbariLocalSessionInterceptor.java:40) at com.google.inject.internal.InterceptorStackCallback$InterceptedMethodInvocation.proceed(InterceptorStackCallback.java:77) at com.google.inject.internal.InterceptorStackCallback.intercept(InterceptorStackCallback.java:55) at org.apache.ambari.server.orm.dao.MetainfoDAO$$EnhancerByGuice$$6c95db51.findByKey(<generated>) at org.apache.ambari.server.checks.DatabaseConsistencyCheckHelper.checkDBVersionCompatible(DatabaseConsistencyCheckHelper.java:222) at org.apache.ambari.server.controller.AmbariServer.main(AmbariServer.java:1099) Caused by: java.net.UnknownHostException: ambari at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:184) at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392) at java.net.Socket.connect(Socket.java:589) at org.postgresql.core.PGStream.<init>(PGStream.java:69) at org.postgresql.core.v3.ConnectionFactoryImpl.openConnectionImpl(ConnectionFactoryImpl.java:156) ... 24 more Jul 10, 2019 10:02:27 PM org.postgresql.core.v3.ConnectionFactoryImpl log WARNING: IOException occurred while connecting to ambari:5432 java.net.UnknownHostException: ambari at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:184) at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392) at java.net.Socket.connect(Socket.java:589) at org.postgresql.core.PGStream.<init>(PGStream.java:69) at org.postgresql.core.v3.ConnectionFactoryImpl.openConnectionImpl(ConnectionFactoryImpl.java:156) at org.postgresql.core.ConnectionFactory.openConnection(ConnectionFactory.java:49) at org.postgresql.jdbc.PgConnection.<init>(PgConnection.java:195) at org.postgresql.Driver.makeConnection(Driver.java:452) at org.postgresql.Driver.connect(Driver.java:254) at org.eclipse.persistence.sessions.DefaultConnector.directConnect(DefaultConnector.java:165) at org.eclipse.persistence.sessions.DefaultConnector.connect(DefaultConnector.java:117) at org.eclipse.persistence.sessions.DatasourceLogin.connectToDatasource(DatasourceLogin.java:162) at org.eclipse.persistence.internal.sessions.DatabaseSessionImpl.setOrDetectDatasource(DatabaseSessionImpl.java:207) at org.eclipse.persistence.internal.sessions.DatabaseSessionImpl.loginAndDetectDatasource(DatabaseSessionImpl.java:760) at org.eclipse.persistence.internal.jpa.EntityManagerFactoryProvider.login(EntityManagerFactoryProvider.java:265) at org.eclipse.persistence.internal.jpa.EntityManagerSetupImpl.deploy(EntityManagerSetupImpl.java:731) at org.eclipse.persistence.internal.jpa.EntityManagerFactoryDelegate.getAbstractSession(EntityManagerFactoryDelegate.java:205) at org.eclipse.persistence.internal.jpa.EntityManagerFactoryDelegate.createEntityManagerImpl(EntityManagerFactoryDelegate.java:305) at org.eclipse.persistence.internal.jpa.EntityManagerFactoryImpl.createEntityManagerImpl(EntityManagerFactoryImpl.java:337) at org.eclipse.persistence.internal.jpa.EntityManagerFactoryImpl.createEntityManager(EntityManagerFactoryImpl.java:303) at com.google.inject.persist.jpa.JpaPersistService.begin(JpaPersistService.java:77) at com.google.inject.persist.jpa.AmbariJpaPersistService.begin(AmbariJpaPersistService.java:28) at org.apache.ambari.server.orm.AmbariLocalSessionInterceptor.invoke(AmbariLocalSessionInterceptor.java:40) at com.google.inject.internal.InterceptorStackCallback$InterceptedMethodInvocation.proceed(InterceptorStackCallback.java:77) at com.google.inject.internal.InterceptorStackCallback.intercept(InterceptorStackCallback.java:55) at org.apache.ambari.server.orm.dao.MetainfoDAO$$EnhancerByGuice$$6c95db51.findByKey(<generated>) at org.apache.ambari.server.checks.DatabaseConsistencyCheckHelper.checkDBVersionCompatible(DatabaseConsistencyCheckHelper.java:222) at org.apache.ambari.server.controller.AmbariServer.main(AmbariServer.java:1099) Jul 10, 2019 10:02:27 PM org.postgresql.Driver connect SEVERE: Connection error: org.postgresql.util.PSQLException: The connection attempt failed. at org.postgresql.core.v3.ConnectionFactoryImpl.openConnectionImpl(ConnectionFactoryImpl.java:257) at org.postgresql.core.ConnectionFactory.openConnection(ConnectionFactory.java:49) at org.postgresql.jdbc.PgConnection.<init>(PgConnection.java:195) at org.postgresql.Driver.makeConnection(Driver.java:452) at org.postgresql.Driver.connect(Driver.java:254) at org.eclipse.persistence.sessions.DefaultConnector.directConnect(DefaultConnector.java:165) at org.eclipse.persistence.sessions.DefaultConnector.connect(DefaultConnector.java:117) at org.eclipse.persistence.sessions.DatasourceLogin.connectToDatasource(DatasourceLogin.java:162) at org.eclipse.persistence.internal.sessions.DatabaseSessionImpl.setOrDetectDatasource(DatabaseSessionImpl.java:207) at org.eclipse.persistence.internal.sessions.DatabaseSessionImpl.loginAndDetectDatasource(DatabaseSessionImpl.java:760) at org.eclipse.persistence.internal.jpa.EntityManagerFactoryProvider.login(EntityManagerFactoryProvider.java:265) at org.eclipse.persistence.internal.jpa.EntityManagerSetupImpl.deploy(EntityManagerSetupImpl.java:731) at org.eclipse.persistence.internal.jpa.EntityManagerFactoryDelegate.getAbstractSession(EntityManagerFactoryDelegate.java:205) at org.eclipse.persistence.internal.jpa.EntityManagerFactoryDelegate.createEntityManagerImpl(EntityManagerFactoryDelegate.java:305) at org.eclipse.persistence.internal.jpa.EntityManagerFactoryImpl.createEntityManagerImpl(EntityManagerFactoryImpl.java:337) at org.eclipse.persistence.internal.jpa.EntityManagerFactoryImpl.createEntityManager(EntityManagerFactoryImpl.java:303) at com.google.inject.persist.jpa.JpaPersistService.begin(JpaPersistService.java:77) at com.google.inject.persist.jpa.AmbariJpaPersistService.begin(AmbariJpaPersistService.java:28) at org.apache.ambari.server.orm.AmbariLocalSessionInterceptor.invoke(AmbariLocalSessionInterceptor.java:40) at com.google.inject.internal.InterceptorStackCallback$InterceptedMethodInvocation.proceed(InterceptorStackCallback.java:77) at com.google.inject.internal.InterceptorStackCallback.intercept(InterceptorStackCallback.java:55) at org.apache.ambari.server.orm.dao.MetainfoDAO$$EnhancerByGuice$$6c95db51.findByKey(<generated>) at org.apache.ambari.server.checks.DatabaseConsistencyCheckHelper.checkDBVersionCompatible(DatabaseConsistencyCheckHelper.java:222) at org.apache.ambari.server.controller.AmbariServer.main(AmbariServer.java:1099) Caused by: java.net.UnknownHostException: ambari at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:184) at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392) at java.net.Socket.connect(Socket.java:589) at org.postgresql.core.PGStream.<init>(PGStream.java:69) at org.postgresql.core.v3.ConnectionFactoryImpl.openConnectionImpl(ConnectionFactoryImpl.java:156) ... 23 more An unexpected error occured during starting Ambari Server. javax.persistence.PersistenceException: Exception [EclipseLink-4002] (Eclipse Persistence Services - 2.6.2.v20151217-774c696): org.eclipse.persistence.exceptions.DatabaseException Internal Exception: org.postgresql.util.PSQLException: The connection attempt failed. Error Code: 0 at org.eclipse.persistence.internal.jpa.EntityManagerSetupImpl.deploy(EntityManagerSetupImpl.java:815) at org.eclipse.persistence.internal.jpa.EntityManagerFactoryDelegate.getAbstractSession(EntityManagerFactoryDelegate.java:205) at org.eclipse.persistence.internal.jpa.EntityManagerFactoryDelegate.createEntityManagerImpl(EntityManagerFactoryDelegate.java:305) at org.eclipse.persistence.internal.jpa.EntityManagerFactoryImpl.createEntityManagerImpl(EntityManagerFactoryImpl.java:337) at org.eclipse.persistence.internal.jpa.EntityManagerFactoryImpl.createEntityManager(EntityManagerFactoryImpl.java:303) at com.google.inject.persist.jpa.JpaPersistService.begin(JpaPersistService.java:77) at com.google.inject.persist.jpa.AmbariJpaPersistService.begin(AmbariJpaPersistService.java:28) at org.apache.ambari.server.orm.AmbariLocalSessionInterceptor.invoke(AmbariLocalSessionInterceptor.java:40) at org.apache.ambari.server.checks.DatabaseConsistencyCheckHelper.checkDBVersionCompatible(DatabaseConsistencyCheckHelper.java:222) at org.apache.ambari.server.controller.AmbariServer.main(AmbariServer.java:1099) Caused by: Exception [EclipseLink-4002] (Eclipse Persistence Services - 2.6.2.v20151217-774c696): org.eclipse.persistence.exceptions.DatabaseException Internal Exception: org.postgresql.util.PSQLException: The connection attempt failed. Error Code: 0 at org.eclipse.persistence.exceptions.DatabaseException.sqlException(DatabaseException.java:331) at org.eclipse.persistence.exceptions.DatabaseException.sqlException(DatabaseException.java:326) at org.eclipse.persistence.sessions.DefaultConnector.connect(DefaultConnector.java:138) at org.eclipse.persistence.sessions.DatasourceLogin.connectToDatasource(DatasourceLogin.java:162) at org.eclipse.persistence.internal.sessions.DatabaseSessionImpl.setOrDetectDatasource(DatabaseSessionImpl.java:207) at org.eclipse.persistence.internal.sessions.DatabaseSessionImpl.loginAndDetectDatasource(DatabaseSessionImpl.java:760) at org.eclipse.persistence.internal.jpa.EntityManagerFactoryProvider.login(EntityManagerFactoryProvider.java:265) at org.eclipse.persistence.internal.jpa.EntityManagerSetupImpl.deploy(EntityManagerSetupImpl.java:731) ... 9 more Caused by: org.postgresql.util.PSQLException: The connection attempt failed. at org.postgresql.core.v3.ConnectionFactoryImpl.openConnectionImpl(ConnectionFactoryImpl.java:257) at org.postgresql.core.ConnectionFactory.openConnection(ConnectionFactory.java:49) at org.postgresql.jdbc.PgConnection.<init>(PgConnection.java:195) at org.postgresql.Driver.makeConnection(Driver.java:452) at org.postgresql.Driver.connect(Driver.java:254) at java.sql.DriverManager.getConnection(DriverManager.java:664) at java.sql.DriverManager.getConnection(DriverManager.java:208) at org.eclipse.persistence.sessions.DefaultConnector.connect(DefaultConnector.java:98) ... 14 more Caused by: java.net.UnknownHostException: ambari at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:184) at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392) at java.net.Socket.connect(Socket.java:589) at org.postgresql.core.PGStream.<init>(PGStream.java:69) at org.postgresql.core.v3.ConnectionFactoryImpl.openConnectionImpl(ConnectionFactoryImpl.java:156) ... 21 more Jul 10, 2019 10:02:27 PM org.postgresql.core.v3.ConnectionFactoryImpl log WARNING: IOException occurred while connecting to ambari:5432 java.net.UnknownHostException: ambari at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:184) at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392) at java.net.Socket.connect(Socket.java:589) at org.postgresql.core.PGStream.<init>(PGStream.java:69) at org.postgresql.core.v3.ConnectionFactoryImpl.openConnectionImpl(ConnectionFactoryImpl.java:156) at org.postgresql.core.ConnectionFactory.openConnection(ConnectionFactory.java:49) at org.postgresql.jdbc.PgConnection.<init>(PgConnection.java:195) at org.postgresql.Driver.makeConnection(Driver.java:452) at org.postgresql.Driver.connect(Driver.java:254) at java.sql.DriverManager.getConnection(DriverManager.java:664) at java.sql.DriverManager.getConnection(DriverManager.java:208) at org.eclipse.persistence.sessions.DefaultConnector.connect(DefaultConnector.java:98) at org.eclipse.persistence.sessions.DatasourceLogin.connectToDatasource(DatasourceLogin.java:162) at org.eclipse.persistence.internal.sessions.DatabaseSessionImpl.setOrDetectDatasource(DatabaseSessionImpl.java:207) at org.eclipse.persistence.internal.sessions.DatabaseSessionImpl.loginAndDetectDatasource(DatabaseSessionImpl.java:760) at org.eclipse.persistence.internal.jpa.EntityManagerFactoryProvider.login(EntityManagerFactoryProvider.java:265) at org.eclipse.persistence.internal.jpa.EntityManagerSetupImpl.deploy(EntityManagerSetupImpl.java:731) at org.eclipse.persistence.internal.jpa.EntityManagerFactoryDelegate.getAbstractSession(EntityManagerFactoryDelegate.java:205) at org.eclipse.persistence.internal.jpa.EntityManagerFactoryDelegate.createEntityManagerImpl(EntityManagerFactoryDelegate.java:305) at org.eclipse.persistence.internal.jpa.EntityManagerFactoryImpl.createEntityManagerImpl(EntityManagerFactoryImpl.java:337) at org.eclipse.persistence.internal.jpa.EntityManagerFactoryImpl.createEntityManager(EntityManagerFactoryImpl.java:303) at com.google.inject.persist.jpa.JpaPersistService.begin(JpaPersistService.java:77) at com.google.inject.persist.jpa.AmbariJpaPersistService.begin(AmbariJpaPersistService.java:28) at org.apache.ambari.server.orm.AmbariLocalSessionInterceptor.invoke(AmbariLocalSessionInterceptor.java:40) at com.google.inject.internal.InterceptorStackCallback$InterceptedMethodInvocation.proceed(InterceptorStackCallback.java:77) at com.google.inject.internal.InterceptorStackCallback.intercept(InterceptorStackCallback.java:55) at org.apache.ambari.server.orm.dao.AmbariConfigurationDAO$$EnhancerByGuice$$59ebffe4.findByCategory(<generated>) at org.apache.ambari.server.configuration.AmbariServerConfigurationProvider.loadInstance(AmbariServerConfigurationProvider.java:123) at org.apache.ambari.server.configuration.AmbariServerConfigurationProvider.jpaInitialized(AmbariServerConfigurationProvider.java:100) 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 com.google.common.eventbus.EventSubscriber.handleEvent(EventSubscriber.java:74) at com.google.common.eventbus.SynchronizedEventSubscriber.handleEvent(SynchronizedEventSubscriber.java:47) at com.google.common.eventbus.EventBus.dispatch(EventBus.java:322) at com.google.common.eventbus.AsyncEventBus.access$001(AsyncEventBus.java:34) at com.google.common.eventbus.AsyncEventBus$1.run(AsyncEventBus.java:117) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) at java.lang.Thread.run(Thread.java:745) please help me 😞 ... View more