Servlets JBOSS和JPA查询-添加新客户

在过去的几天里，我一直在与这个问题作斗争，我已经筋疲力尽了。请有人帮我找出哪里出了问题/为什么出了问题。非常感谢

以下是我的故事： 我正在使用JBoss6.10和Potgres9.1构建一个WebEE应用程序。最终，我将对视图使用JSF，但现在我使用一个简单的Servlet com.shop.cart.ShoppingCartClient.java来测试数据库连接，并将CustomerManager无卫星会话bean注入Servlet，该会话bean有一个执行EntityManager、Persiste的方法来存储新创建的客户实体。 该应用程序名为HawellyPlaceShop—war文件部署正常，当我在浏览器Chrome上调用Servlet时，jBOSS控制台中出现以下错误：

最新错误：

12:09:24,768 WARN  [org.hibernate.util.JDBCExceptionReporter] SQL Error: 0, SQLState: 23502
12:09:24,768 ERROR [org.hibernate.util.JDBCExceptionReporter] ERROR: null value in column "customerid" violates not-null constraint
  Detail: Failing row contains (null, null, null, null).
12:09:24,785 ERROR [org.apache.catalina.core.ContainerBase.[jboss.web].[localhost].[/HawleyPlaceShop].[/ShoppingCartClient]] Servlet.service() for servlet /ShoppingCartClient threw exception: javax.ejb.EJBException: javax.persistence.PersistenceException: org.hibernate.exception.ConstraintViolationException: could not insert: [com.shop.entity.Customer]
    at org.jboss.ejb3.tx2.impl.CMTTxInterceptor.handleExceptionInOurTx(CMTTxInterceptor.java:183) [:0.0.2]
    at org.jboss.ejb3.tx2.impl.CMTTxInterceptor.invokeInOurTx(CMTTxInterceptor.java:251) [:0.0.2]
    at org.jboss.ejb3.tx2.impl.CMTTxInterceptor.required(CMTTxInterceptor.java:349) [:0.0.2]
    at org.jboss.ejb3.tx2.impl.CMTTxInterceptor.invoke(CMTTxInterceptor.java:209) [:0.0.2]
    at org.jboss.ejb3.tx2.aop.CMTTxInterceptorWrapper.invoke(CMTTxInterceptorWrapper.java:52) [:0.0.2]
    at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102) [jboss-aop.jar:2.2.2.GA]
    at org.jboss.aspects.tx.TxPropagationInterceptor.invoke(TxPropagationInterceptor.java:76) [:1.0.0.GA]
    at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102) [jboss-aop.jar:2.2.2.GA]
    at org.jboss.ejb3.tx.NullInterceptor.invoke(NullInterceptor.java:42) [:1.0.4]
    at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102) [jboss-aop.jar:2.2.2.GA]
    at org.jboss.ejb3.security.Ejb3AuthenticationInterceptorv2.invoke(Ejb3AuthenticationInterceptorv2.java:182) [:1.7.21]
    at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102) [jboss-aop.jar:2.2.2.GA]
    at org.jboss.ejb3.ENCPropagationInterceptor.invoke(ENCPropagationInterceptor.java:41) [:1.7.21]
    at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102) [jboss-aop.jar:2.2.2.GA]
    at org.jboss.ejb3.BlockContainerShutdownInterceptor.invoke(BlockContainerShutdownInterceptor.java:67) [:1.7.21]
    at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102) [jboss-aop.jar:2.2.2.GA]
    at org.jboss.ejb3.core.context.CurrentInvocationContextInterceptor.invoke(CurrentInvocationContextInterceptor.java:47) [:1.7.21]
    at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102) [jboss-aop.jar:2.2.2.GA]
    at org.jboss.aspects.currentinvocation.CurrentInvocationInterceptor.invoke(CurrentInvocationInterceptor.java:67) [:1.0.1]
    at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102) [jboss-aop.jar:2.2.2.GA]
    at org.jboss.ejb3.interceptor.EJB3TCCLInterceptor.invoke(EJB3TCCLInterceptor.java:86) [:1.7.21]
    at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102) [jboss-aop.jar:2.2.2.GA]
    at org.jboss.ejb3.session.SessionSpecContainer.invoke(SessionSpecContainer.java:333) [:1.7.21]
    at org.jboss.ejb3.session.SessionSpecContainer.invoke(SessionSpecContainer.java:390) [:1.7.21]
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) [:1.7.0_65]
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) [:1.7.0_65]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) [:1.7.0_65]
    at java.lang.reflect.Method.invoke(Unknown Source) [:1.7.0_65]
    at org.jboss.ejb3.proxy.impl.handler.session.SessionLocalProxyInvocationHandler$LocalContainerInvocation.invokeTarget(SessionLocalProxyInvocationHandler.java:184) [:1.0.11]
    at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:111) [jboss-aop.jar:2.2.2.GA]
    at org.jboss.ejb3.async.impl.interceptor.AsynchronousClientInterceptor.invoke(AsynchronousClientInterceptor.java:143) [:1.7.21]
    at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102) [jboss-aop.jar:2.2.2.GA]
    at org.jboss.ejb3.proxy.impl.handler.session.SessionLocalProxyInvocationHandler$LocalInvokableContextHandler.invoke(SessionLocalProxyInvocationHandler.java:159) [:1.0.11]
    at com.sun.proxy.$Proxy166.invoke(Unknown Source)
    at org.jboss.ejb3.proxy.impl.handler.session.SessionProxyInvocationHandlerBase.invoke(SessionProxyInvocationHandlerBase.java:185) [:1.0.11]
    at com.sun.proxy.$Proxy189.persistNewCustomer(Unknown Source)
    at com.shop.cart.ShoppingCartClient.processRequest(ShoppingCartClient.java:41) [:]
    at com.shop.cart.ShoppingCartClient.doGet(ShoppingCartClient.java:77) [:]
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:734) [:1.0.0.Final]
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:847) [:1.0.0.Final]
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:324) [:6.1.0.Final]
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:242) [:6.1.0.Final]
    at org.jboss.weld.servlet.ConversationPropagationFilter.doFilter(ConversationPropagationFilter.java:67) [:6.1.0.Final]
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:274) [:6.1.0.Final]
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:242) [:6.1.0.Final]
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:275) [:6.1.0.Final]
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:161) [:6.1.0.Final]
    at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:181) [:6.1.0.Final]
    at org.jboss.modcluster.catalina.CatalinaContext$RequestListenerValve.event(CatalinaContext.java:285) [:1.1.0.Final]
    at org.jboss.modcluster.catalina.CatalinaContext$RequestListenerValve.invoke(CatalinaContext.java:261) [:1.1.0.Final]
    at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:88) [:6.1.0.Final]
    at org.jboss.web.tomcat.security.SecurityContextEstablishmentValve.invoke(SecurityContextEstablishmentValve.java:100) [:6.1.0.Final]
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:159) [:6.1.0.Final]
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) [:6.1.0.Final]
    at org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:158) [:6.1.0.Final]
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) [:6.1.0.Final]
    at org.jboss.web.tomcat.service.request.ActiveRequestResponseCacheValve.invoke(ActiveRequestResponseCacheValve.java:53) [:6.1.0.Final]
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:362) [:6.1.0.Final]
    at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:877) [:6.1.0.Final]
    at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:654) [:6.1.0.Final]
    at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:951) [:6.1.0.Final]
    at java.lang.Thread.run(Unknown Source) [:1.7.0_65]
Caused by: javax.persistence.PersistenceException: org.hibernate.exception.ConstraintViolationException: could not insert: [com.shop.entity.Customer]
    at org.hibernate.ejb.AbstractEntityManagerImpl.convert(AbstractEntityManagerImpl.java:1215) [:3.6.6.Final]
    at org.hibernate.ejb.AbstractEntityManagerImpl.convert(AbstractEntityManagerImpl.java:1148) [:3.6.6.Final]
    at org.hibernate.ejb.AbstractEntityManagerImpl.convert(AbstractEntityManagerImpl.java:1154) [:3.6.6.Final]
    at org.hibernate.ejb.AbstractEntityManagerImpl.persist(AbstractEntityManagerImpl.java:678) [:3.6.6.Final]
    at org.jboss.jpa.impl.tx.TransactionScopedEntityManager.persist(TransactionScopedEntityManager.java:206) [:2.0.0]
    at com.shop.entity.CustomerManagerBean.persistNewCustomer(CustomerManagerBean.java:58) [:]
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) [:1.7.0_65]
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) [:1.7.0_65]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) [:1.7.0_65]
    at java.lang.reflect.Method.invoke(Unknown Source) [:1.7.0_65]
    at org.jboss.aop.joinpoint.MethodInvocation.invokeTarget(MethodInvocation.java:122) [jboss-aop.jar:2.2.2.GA]
    at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:111) [jboss-aop.jar:2.2.2.GA]
    at org.jboss.ejb3.interceptors.container.ContainerMethodInvocationWrapper.invokeNext(ContainerMethodInvocationWrapper.java:72) [:1.1.3]
    at org.jboss.ejb3.interceptors.aop.InvocationContextInterceptor$InvocationContext.proceed(InvocationContextInterceptor.java:127) [:1.1.3]
    at org.jboss.weld.integration.ejb.interceptor.Jsr299BindingsInterceptor.doMethodInterception(Jsr299BindingsInterceptor.java:151) [:6.1.0.Final]
    at org.jboss.weld.integration.ejb.interceptor.Jsr299BindingsInterceptor.doAroundInvoke(Jsr299BindingsInterceptor.java:122) [:6.1.0.Final]
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) [:1.7.0_65]
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) [:1.7.0_65]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) [:1.7.0_65]
    at java.lang.reflect.Method.invoke(Unknown Source) [:1.7.0_65]
    at org.jboss.ejb3.interceptors.aop.EJB3InterceptorInterceptor.invoke(EJB3InterceptorInterceptor.java:80) [:1.1.3]
    at org.jboss.ejb3.interceptors.aop.EJB3InterceptorInterceptor.invoke(EJB3InterceptorInterceptor.java:71) [:1.1.3]
    at org.jboss.ejb3.interceptors.container.ContainerMethodInvocationWrapper.invokeNext(ContainerMethodInvocationWrapper.java:62) [:1.1.3]
    at org.jboss.ejb3.interceptors.aop.InvocationContextInterceptor$InvocationContext.proceed(InvocationContextInterceptor.java:127) [:1.1.3]
    at org.jboss.weld.ejb.SessionBeanInterceptor.aroundInvoke(SessionBeanInterceptor.java:46) [:6.1.0.Final]
    at org.jboss.weld.integration.deployer.metadata.WeldLifecycleInterceptor.doAroundInvoke(WeldLifecycleInterceptor.java:55) [:6.1.0.Final]
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) [:1.7.0_65]
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) [:1.7.0_65]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) [:1.7.0_65]
    at java.lang.reflect.Method.invoke(Unknown Source) [:1.7.0_65]
    at org.jboss.ejb3.interceptors.aop.EJB3InterceptorInterceptor.invoke(EJB3InterceptorInterceptor.java:80) [:1.1.3]
    at org.jboss.ejb3.interceptors.aop.EJB3InterceptorInterceptor.invoke(EJB3InterceptorInterceptor.java:71) [:1.1.3]
    at org.jboss.ejb3.interceptors.container.ContainerMethodInvocationWrapper.invokeNext(ContainerMethodInvocationWrapper.java:62) [:1.1.3]
    at org.jboss.ejb3.interceptors.aop.InterceptorSequencer.invoke(InterceptorSequencer.java:76) [:1.1.3]
    at org.jboss.ejb3.interceptors.aop.InterceptorSequencer.aroundInvoke(InterceptorSequencer.java:62) [:1.1.3]
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) [:1.7.0_65]
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) [:1.7.0_65]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) [:1.7.0_65]
    at java.lang.reflect.Method.invoke(Unknown Source) [:1.7.0_65]
    at org.jboss.aop.advice.PerJoinpointAdvice.invoke(PerJoinpointAdvice.java:174) [jboss-aop.jar:2.2.2.GA]
    at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102) [jboss-aop.jar:2.2.2.GA]
    at org.jboss.ejb3.interceptors.aop.InvocationContextInterceptor.fillMethod(InvocationContextInterceptor.java:74) [:1.1.3]
    at org.jboss.aop.advice.org.jboss.ejb3.interceptors.aop.InvocationContextInterceptor_z_fillMethod_1281133.invoke(InvocationContextInterceptor_z_fillMethod_1281133.java) [:]
    at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102) [jboss-aop.jar:2.2.2.GA]
    at org.jboss.ejb3.interceptors.aop.InvocationContextInterceptor.setup(InvocationContextInterceptor.java:90) [:1.1.3]
    at org.jboss.aop.advice.org.jboss.ejb3.interceptors.aop.InvocationContextInterceptor_z_setup_1281133.invoke(InvocationContextInterceptor_z_setup_1281133.java) [:]
    at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102) [jboss-aop.jar:2.2.2.GA]
    at org.jboss.ejb3.async.impl.interceptor.AsynchronousServerInterceptor.invoke(AsynchronousServerInterceptor.java:128) [:1.7.21]
    at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102) [jboss-aop.jar:2.2.2.GA]
    at org.jboss.ejb3.connectionmanager.CachedConnectionInterceptor.invoke(CachedConnectionInterceptor.java:62) [:1.7.21]
    at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102) [jboss-aop.jar:2.2.2.GA]
    at org.jboss.ejb3.entity.TransactionScopedEntityManagerInterceptor.invoke(TransactionScopedEntityManagerInterceptor.java:56) [:1.7.21]
    at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102) [jboss-aop.jar:2.2.2.GA]
    at org.jboss.ejb3.AllowedOperationsInterceptor.invoke(AllowedOperationsInterceptor.java:47) [:1.7.21]
    at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102) [jboss-aop.jar:2.2.2.GA]
    at org.jboss.ejb3.tx.NullInterceptor.invoke(NullInterceptor.java:42) [:1.0.4]
    at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102) [jboss-aop.jar:2.2.2.GA]
    at org.jboss.ejb3.stateless.StatelessInstanceInterceptor.invoke(StatelessInstanceInterceptor.java:68) [:1.7.21]
    at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102) [jboss-aop.jar:2.2.2.GA]
    at org.jboss.ejb3.core.context.SessionInvocationContextAdapter.proceed(SessionInvocationContextAdapter.java:95) [:1.7.21]
    at org.jboss.ejb3.tx2.impl.CMTTxInterceptor.invokeInOurTx(CMTTxInterceptor.java:247) [:0.0.2]
    ... 60 more
Caused by: org.hibernate.exception.ConstraintViolationException: could not insert: [com.shop.entity.Customer]
    at org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:96) [:3.6.6.Final]
    at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:66) [:3.6.6.Final]
    at org.hibernate.id.insert.AbstractReturningDelegate.performInsert(AbstractReturningDelegate.java:64) [:3.6.6.Final]
    at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:2345) [:3.6.6.Final]
    at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:2852) [:3.6.6.Final]
    at org.hibernate.action.EntityIdentityInsertAction.execute(EntityIdentityInsertAction.java:71) [:3.6.6.Final]
    at org.hibernate.engine.ActionQueue.execute(ActionQueue.java:273) [:3.6.6.Final]
    at org.hibernate.event.def.AbstractSaveEventListener.performSaveOrReplicate(AbstractSaveEventListener.java:320) [:3.6.6.Final]
    at org.hibernate.event.def.AbstractSaveEventListener.performSave(AbstractSaveEventListener.java:203) [:3.6.6.Final]
    at org.hibernate.event.def.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:129) [:3.6.6.Final]
    at org.hibernate.ejb.event.EJB3PersistEventListener.saveWithGeneratedId(EJB3PersistEventListener.java:69) [:3.6.6.Final]
    at org.hibernate.event.def.DefaultPersistEventListener.entityIsTransient(DefaultPersistEventListener.java:179) [:3.6.6.Final]
    at org.hibernate.event.def.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:135) [:3.6.6.Final]
    at org.hibernate.event.def.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:61) [:3.6.6.Final]
    at org.hibernate.impl.SessionImpl.firePersist(SessionImpl.java:808) [:3.6.6.Final]
    at org.hibernate.impl.SessionImpl.persist(SessionImpl.java:782) [:3.6.6.Final]
    at org.hibernate.impl.SessionImpl.persist(SessionImpl.java:786) [:3.6.6.Final]
    at org.hibernate.ejb.AbstractEntityManagerImpl.persist(AbstractEntityManagerImpl.java:672) [:3.6.6.Final]
    ... 117 more
Caused by: org.postgresql.util.PSQLException: ERROR: null value in column "customerid" violates not-null constraint
  Detail: Failing row contains (null, null, null, null).
    at org.postgresql.core.v3.QueryExecutorImpl.receiveErrorResponse(QueryExecutorImpl.java:2198) [:]
    at org.postgresql.core.v3.QueryExecutorImpl.processResults(QueryExecutorImpl.java:1927) [:]
    at org.postgresql.core.v3.QueryExecutorImpl.execute(QueryExecutorImpl.java:255) [:]
    at org.postgresql.jdbc2.AbstractJdbc2Statement.execute(AbstractJdbc2Statement.java:561) [:]
    at org.postgresql.jdbc2.AbstractJdbc2Statement.executeWithFlags(AbstractJdbc2Statement.java:419) [:]
    at org.postgresql.jdbc2.AbstractJdbc2Statement.executeUpdate(AbstractJdbc2Statement.java:365) [:]
    at org.jboss.resource.adapter.jdbc.WrappedPreparedStatement.executeUpdate(WrappedPreparedStatement.java:365) [:6.1.0.Final]
    at org.hibernate.id.IdentityGenerator$GetGeneratedKeysDelegate.executeAndExtract(IdentityGenerator.java:94) [:3.6.6.Final]
    at org.hibernate.id.insert.AbstractReturningDelegate.performInsert(AbstractReturningDelegate.java:57) [:3.6.6.Final]
    ... 132 more

客户实体bean

package com.shop.entity;
import java.io.Serializable;

import javax.persistence.Basic;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.SecondaryTable;
import javax.persistence.SequenceGenerator;
import javax.persistence.Table;

/**
 * @author Lalin
 *
 */
@Entity(name="Customer")
@Table(name="Customer")
@SecondaryTable(name="Customer")


public class Customer implements Serializable {

    //public Customer(){} // non arg constructor - can have others

    @Id
    @Column (name = "CustomerId", nullable = false, insertable = true)

    @GeneratedValue(strategy = GenerationType.IDENTITY)

    private Integer CustomerId;
    @Basic(fetch=FetchType.EAGER)
    @Column(name="Name", table="Customer")
    private String Name;
    @Basic(fetch=FetchType.EAGER)
    @Column(name="Telephone", table="Customer")
    private String Telephone;
    @Basic(fetch=FetchType.EAGER)
    @Column(name="MobilePhone", table="Customer")
    private String MobilePhone;
    private static final long serialVersionUID = 1L;

    public Integer getCustomerId() {
        return CustomerId;
    }

    public void setCustomerId(Integer customerId) {
        this.CustomerId= customerId;
    }

    public String getName() {
        return Name;
    }

    public void setName(String name) {
        this.Name = name;
    }

    public String getTelephone() {
        return Telephone;
    }

    public void setTelephone(String telephone) {
        this.Telephone = telephone;
    }

    public String getMobilePhone() {
        return MobilePhone;
    }

    public void setMobilePhone(String mobilePhone) {
        this.MobilePhone = mobilePhone;
    }


}

---

在持久类上有@Entity注释，但它没有定义表属性：

@Entity
@Table(name="CUSTOMER")
public class Customer implements Serializable {
  // ...
}

---

或者不管表名是什么。

它的工作原理！！！！似乎在使用JPA时，必须为POJO使用不同的名称，包括实体注释和数据库中的表。最初我给他们两个都命名为同一个客户，当我更改名称POJO:CustomerEntity，Postgres table:Customer时，效果非常好。我仍在使用序列，并且主键数据类型为串行

嗨，米尔延科，谢谢你的回复。我以为@Table注释在数据库中设置了相应的表名？谢谢回复。我认为表注释在数据库中设置了相应的表名？此外，我是否必须在持久类中的所有字段上显式使用列注释？如果不定义表注释，JPA将使用类名作为表名。字段也是如此：如果字段没有列定义，那么JPA使用字段名作为列名。这些注释专门用于将JPA实体自定义为数据库属性。您的数据库中是否定义了表CUSTOMER？用于连接数据库的用户postgres是否看到此表？尝试删除hibernate属性hibernate.dialent它被使用了两次，hibernate.connection.username和hibernate.connection.password它们已经在数据源级别上定义。或者在安装程序启动时创建表时，从persistence.xml中删除所有特定于hibernate的属性。此外，属性hibernate.hbm2ddl.auto无效。有效值为validate | update | create | create drop。您的EntityManager似乎为null。在应用程序启动过程中是否有您没有提到的其他错误？另外，你们能试着调试一下这个方法，看看发生了什么吗？实体管理器的问题已经解决了thabks给你们@Miljenko。现在它在抱怨与数据库的连接。请参见上面的控制台信息，这很简单：类路径中缺少PostgreSQL JDBC驱动程序。获取JDBC驱动程序，并将其复制到application servers lib目录中，例如standalone/deployments。有关它和数据源创建的更多信息，请访问