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The column name "Id" was not found in this ResultSet. Can someone explain what is wrong in my code. Thank you in advance. Full sever log: 2017-02-09 13:37:40,650 ERROR [io.undertow.request] (default task-15) UT005023: Exception handling request to
org.postgresql.util.PSQLException: The column name "Id" was not found in this ResultSet.	at org.postgresql.jdbc.PgResultSet.findColumn(PgResultSet.java:2591)	at org.postgresql.jdbc.PgResultSet.getLong(PgResultSet.java:2489)	at org.jboss.jca.adapters.jdbc.WrappedResultSet.getLong(WrappedResultSet.java:1583)	at org.hibernate.id.IdentifierGeneratorHelper.get(IdentifierGeneratorHelper.java:138)	at org.hibernate.id.IdentifierGeneratorHelper.getGeneratedIdentity(IdentifierGeneratorHelper.java:73)	at org.hibernate.dialect.identity.GetGeneratedKeysDelegate.executeAndExtract(GetGeneratedKeysDelegate.java:61)	at org.hibernate.id.insert.AbstractReturningDelegate.performInsert(AbstractReturningDelegate.java:42)	at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:2803)	at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:3374)	at org.hibernate.action.internal.EntityIdentityInsertAction.execute(EntityIdentityInsertAction.java:81)	at org.hibernate.engine.spi.ActionQueue.execute(ActionQueue.java:619)	at org.hibernate.engine.spi.ActionQueue.addResolvedEntityInsertAction(ActionQueue.java:273)	at org.hibernate.engine.spi.ActionQueue.addInsertAction(ActionQueue.java:254)	at org.hibernate.engine.spi.ActionQueue.addAction(ActionQueue.java:299)	at org.hibernate.event.internal.AbstractSaveEventListener.addInsertAction(AbstractSaveEventListener.java:317)	at org.hibernate.event.internal.AbstractSaveEventListener.performSaveOrReplicate(AbstractSaveEventListener.java:272)	at org.hibernate.event.internal.AbstractSaveEventListener.performSave(AbstractSaveEventListener.java:178)	at org.hibernate.event.internal.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:109)	at org.hibernate.jpa.event.internal.core.JpaPersistEventListener.saveWithGeneratedId(JpaPersistEventListener.java:67)	at org.hibernate.event.internal.DefaultPersistEventListener.entityIsTransient(DefaultPersistEventListener.java:189)	at org.hibernate.event.internal.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:132)	at org.hibernate.event.internal.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:58)	at org.hibernate.internal.SessionImpl.firePersist(SessionImpl.java:775)	at org.hibernate.internal.SessionImpl.persist(SessionImpl.java:748)	at org.hibernate.internal.SessionImpl.persist(SessionImpl.java:753)	at org.hibernate.jpa.spi.AbstractEntityManagerImpl.persist(AbstractEntityManagerImpl.java:1146)	at org.jboss.as.jpa.container.AbstractEntityManager.persist(AbstractEntityManager.java:580)	at org.jboss.tools.examples.rest.CompanyEndpoint.create(CompanyEndpoint.java:37)	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.jboss.as.ee.component.ManagedReferenceMethodInterceptor.processInvocation(ManagedReferenceMethodInterceptor.java:52)	at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:340)	at org.jboss.invocation.InterceptorContext$Invocation.proceed(InterceptorContext.java:437)	at org.jboss.as.weld.ejb.Jsr299BindingsInterceptor.doMethodInterception(Jsr299BindingsInterceptor.java:82)	at org.jboss.as.weld.ejb.Jsr299BindingsInterceptor.processInvocation(Jsr299BindingsInterceptor.java:93)	at org.jboss.as.ee.component.interceptors.UserInterceptorFactory$1.processInvocation(UserInterceptorFactory.java:63)	at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:340)	at org.jboss.as.ejb3.component.invocationmetrics.ExecutionTimeInterceptor.processInvocation(ExecutionTimeInterceptor.java:43)	at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:340)	at org.jboss.as.jpa.interceptor.SBInvocationInterceptor.processInvocation(SBInvocationInterceptor.java:47)	at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:340)	at org.jboss.invocation.InterceptorContext$Invocation.proceed(InterceptorContext.java:437)	at org.jboss.weld.ejb.AbstractEJBRequestScopeActivationInterceptor.aroundInvoke(AbstractEJBRequestScopeActivationInterceptor.java:64)	at org.jboss.as.weld.ejb.EjbRequestScopeActivationInterceptor.processInvocation(EjbRequestScopeActivationInterceptor.java:83)	at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:340)	at org.jboss.as.ee.concurrent.ConcurrentContextInterceptor.processInvocation(ConcurrentContextInterceptor.java:45)	at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:340)	at org.jboss.invocation.InitialInterceptor.processInvocation(InitialInterceptor.java:21)	at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:340)	at org.jboss.invocation.ChainedInterceptor.processInvocation(ChainedInterceptor.java:61)	at org.jboss.as.ee.component.interceptors.ComponentDispatcherInterceptor.processInvocation(ComponentDispatcherInterceptor.java:52)	at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:340)	at org.jboss.as.ejb3.component.pool.PooledInstanceInterceptor.processInvocation(PooledInstanceInterceptor.java:51)	at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:340)	at org.jboss.as.ejb3.tx.CMTTxInterceptor.invokeInOurTx(CMTTxInterceptor.java:275)	at org.jboss.as.ejb3.tx.CMTTxInterceptor.required(CMTTxInterceptor.java:327)	at org.jboss.as.ejb3.tx.CMTTxInterceptor.processInvocation(CMTTxInterceptor.java:239)	at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:340)	at org.jboss.as.ejb3.component.interceptors.CurrentInvocationContextInterceptor.processInvocation(CurrentInvocationContextInterceptor.java:41)	at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:340)	at org.jboss.as.ejb3.component.invocationmetrics.WaitTimeInterceptor.processInvocation(WaitTimeInterceptor.java:47)	at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:340)	at org.jboss.as.ejb3.security.SecurityContextInterceptor.processInvocation(SecurityContextInterceptor.java:100)	at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:340)	at org.jboss.as.ejb3.deployment.processors.StartupAwaitInterceptor.processInvocation(StartupAwaitInterceptor.java:22)	at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:340)	at org.jboss.as.ejb3.component.interceptors.ShutDownInterceptorFactory$1.processInvocation(ShutDownInterceptorFactory.java:64)	at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:340)	at org.jboss.as.ejb3.component.interceptors.LoggingInterceptor.processInvocation(LoggingInterceptor.java:67)	at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:340)	at org.jboss.as.ee.component.NamespaceContextInterceptor.processInvocation(NamespaceContextInterceptor.java:50)	at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:340)	at org.jboss.as.ejb3.component.interceptors.AdditionalSetupInterceptor.processInvocation(AdditionalSetupInterceptor.java:54)	at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:340)	at org.jboss.invocation.ContextClassLoaderInterceptor.processInvocation(ContextClassLoaderInterceptor.java:64)	at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:340)	at org.jboss.invocation.InterceptorContext.run(InterceptorContext.java:356)	at org.wildfly.security.manager.WildFlySecurityManager.doChecked(WildFlySecurityManager.java:636)	at org.jboss.invocation.AccessCheckingInterceptor.processInvocation(AccessCheckingInterceptor.java:61)	at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:340)	at org.jboss.invocation.InterceptorContext.run(InterceptorContext.java:356)	at org.jboss.invocation.PrivilegedWithCombinerInterceptor.processInvocation(PrivilegedWithCombinerInterceptor.java:80)	at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:340)	at org.jboss.invocation.ChainedInterceptor.processInvocation(ChainedInterceptor.java:61)	at org.jboss.as.ee.component.ViewService$View.invoke(ViewService.java:198)	at org.jboss.as.ee.component.ViewDescription$1.processInvocation(ViewDescription.java:185)	at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:340)	at org.jboss.invocation.ChainedInterceptor.processInvocation(ChainedInterceptor.java:61)	at org.jboss.as.ee.component.ProxyInvocationHandler.invoke(ProxyInvocationHandler.java:73)	at org.jboss.tools.examples.rest.CompanyEndpoint$$$view398.create(Unknown Source)	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.jboss.resteasy.core.MethodInjectorImpl.invoke(MethodInjectorImpl.java:139)	at org.jboss.resteasy.core.ResourceMethodInvoker.invokeOnTarget(ResourceMethodInvoker.java:295)	at org.jboss.resteasy.core.ResourceMethodInvoker.invoke(ResourceMethodInvoker.java:249)	at org.jboss.resteasy.core.ResourceMethodInvoker.invoke(ResourceMethodInvoker.java:236)	at org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:402)	at org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:209)	at org.jboss.resteasy.plugins.server.servlet.ServletContainerDispatcher.service(ServletContainerDispatcher.java:221)	at org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.service(HttpServletDispatcher.java:56)	at org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.service(HttpServletDispatcher.java:51)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)	at io.undertow.servlet.handlers.ServletHandler.handleRequest(ServletHandler.java:85)	at io.undertow.servlet.handlers.security.ServletSecurityRoleHandler.handleRequest(ServletSecurityRoleHandler.java:62)	at io.undertow.servlet.handlers.ServletDispatchingHandler.handleRequest(ServletDispatchingHandler.java:36)	at org.wildfly.extension.undertow.security.SecurityContextAssociationHandler.handleRequest(SecurityContextAssociationHandler.java:78)	at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)	at io.undertow.servlet.handlers.security.SSLInformationAssociationHandler.handleRequest(SSLInformationAssociationHandler.java:131)	at io.undertow.servlet.handlers.security.ServletAuthenticationCallHandler.handleRequest(ServletAuthenticationCallHandler.java:57)	at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)	at io.undertow.security.handlers.AbstractConfidentialityHandler.handleRequest(AbstractConfidentialityHandler.java:46)	at io.undertow.servlet.handlers.security.ServletConfidentialityConstraintHandler.handleRequest(ServletConfidentialityConstraintHandler.java:64)	at io.undertow.security.handlers.AuthenticationMechanismsHandler.handleRequest(AuthenticationMechanismsHandler.java:60)	at io.undertow.servlet.handlers.security.CachedAuthenticatedSessionHandler.handleRequest(CachedAuthenticatedSessionHandler.java:77)	at io.undertow.security.handlers.NotificationReceiverHandler.handleRequest(NotificationReceiverHandler.java:50)	at io.undertow.security.handlers.AbstractSecurityContextAssociationHandler.handleRequest(AbstractSecurityContextAssociationHandler.java:43)	at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)	at org.wildfly.extension.undertow.security.jacc.JACCContextIdHandler.handleRequest(JACCContextIdHandler.java:61)	at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)	at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)	at io.undertow.servlet.handlers.ServletInitialHandler.handleFirstRequest(ServletInitialHandler.java:292)	at io.undertow.servlet.handlers.ServletInitialHandler.access$100(ServletInitialHandler.java:81)	at io.undertow.servlet.handlers.ServletInitialHandler$2.call(ServletInitialHandler.java:138)	at io.undertow.servlet.handlers.ServletInitialHandler$2.call(ServletInitialHandler.java:135)	at io.undertow.servlet.core.ServletRequestContextThreadSetupAction$1.call(ServletRequestContextThreadSetupAction.java:48)	at io.undertow.servlet.core.ContextClassLoaderSetupAction$1.call(ContextClassLoaderSetupAction.java:43)	at io.undertow.servlet.api.LegacyThreadSetupActionWrapper$1.call(LegacyThreadSetupActionWrapper.java:44)	at io.undertow.servlet.api.LegacyThreadSetupActionWrapper$1.call(LegacyThreadSetupActionWrapper.java:44)	at io.undertow.servlet.api.LegacyThreadSetupActionWrapper$1.call(LegacyThreadSetupActionWrapper.java:44)	at io.undertow.servlet.api.LegacyThreadSetupActionWrapper$1.call(LegacyThreadSetupActionWrapper.java:44)	at io.undertow.servlet.api.LegacyThreadSetupActionWrapper$1.call(LegacyThreadSetupActionWrapper.java:44)	at io.undertow.servlet.api.LegacyThreadSetupActionWrapper$1.call(LegacyThreadSetupActionWrapper.java:44)	at io.undertow.servlet.handlers.ServletInitialHandler.dispatchRequest(ServletInitialHandler.java:272)	at io.undertow.servlet.handlers.ServletInitialHandler.access$000(ServletInitialHandler.java:81)	at io.undertow.servlet.handlers.ServletInitialHandler$1.handleRequest(ServletInitialHandler.java:104)	at io.undertow.server.Connectors.executeRootHandler(Connectors.java:202)	at io.undertow.server.HttpServerExchange$1.run(HttpServerExchange.java:805)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)	at java.lang.Thread.run(Thread.java:745)