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JavaWeb图书答疑

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java 全程开发实录第七章欣想电子商城用户注册模块不能使用一直出错。

发表在JavaWeb图书答疑 2015-05-04

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HTTP Status 500 - Request processing failed; nested exception is org.hibernate.AssertionFailure: null id in com.lzw.model.TbMember entry (don't flush the Session after an exception occurs)

type Exception report

message Request processing failed; nested exception is org.hibernate.AssertionFailure: null id in com.lzw.model.TbMember entry (don't flush the Session after an exception occurs)

description The server encountered an internal error that prevented it from fulfilling this request.

exception

org.springframework.web.util.NestedServletException: Request processing failed; nested exception is org.hibernate.AssertionFailure: null id in com.lzw.model.TbMember entry (don't flush the Session after an exception occurs)
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:656)
org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:560)
javax.servlet.http.HttpServlet.service(HttpServlet.java:646)
javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
root cause

org.hibernate.AssertionFailure: null id in com.lzw.model.TbMember entry (don't flush the Session after an exception occurs)
org.hibernate.event.def.DefaultFlushEntityEventListener.checkId(DefaultFlushEntityEventListener.java:82)
org.hibernate.event.def.DefaultFlushEntityEventListener.getValues(DefaultFlushEntityEventListener.java:190)
org.hibernate.event.def.DefaultFlushEntityEventListener.onFlushEntity(DefaultFlushEntityEventListener.java:147)
org.hibernate.event.def.AbstractFlushingEventListener.flushEntities(AbstractFlushingEventListener.java:219)
org.hibernate.event.def.AbstractFlushingEventListener.flushEverythingToExecutions(AbstractFlushingEventListener.java:99)
org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:50)
org.hibernate.impl.SessionImpl.flush(SessionImpl.java:1216)
org.hibernate.impl.SessionImpl.managedFlush(SessionImpl.java:383)
org.hibernate.transaction.JDBCTransaction.commit(JDBCTransaction.java:133)
org.springframework.orm.hibernate3.HibernateTransactionManager.doCommit(HibernateTransactionManager.java:656)
org.springframework.transaction.support.AbstractPlatformTransactionManager.processCommit(AbstractPlatformTransactionManager.java:754)
org.springframework.transaction.support.AbstractPlatformTransactionManager.commit(AbstractPlatformTransactionManager.java:723)
org.springframework.transaction.interceptor.TransactionAspectSupport.commitTransactionAfterReturning(TransactionAspectSupport.java:393)
org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:120)
org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
org.springframework.aop.framework.Cglib2AopProxy$DynamicAdvisedInterceptor.intercept(Cglib2AopProxy.java:621)
com.lzw.dao.Dao$$EnhancerByCGLIB$$3c74af0f.insertObject(<generated>)
com.lzw.RegisterController.onSubmit(RegisterController.java:32)
org.springframework.web.servlet.mvc.SimpleFormController.onSubmit(SimpleFormController.java:387)
org.springframework.web.servlet.mvc.SimpleFormController.processFormSubmission(SimpleFormController.java:272)
org.springframework.web.servlet.mvc.AbstractFormController.handleRequestInternal(AbstractFormController.java:268)
com.lzw.RegisterController.handleRequestInternal(RegisterController.java:38)
org.springframework.web.servlet.mvc.AbstractController.handleRequest(AbstractController.java:153)
org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter.handle(SimpleControllerHandlerAdapter.java:48)
org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:790)
org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:719)
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:644)
org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:560)
javax.servlet.http.HttpServlet.service(HttpServlet.java:646)
javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
note The full stack trace of the root cause is available in the Apache Tomcat/7.0.54 logs.

Apache Tomcat/7.0.54

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2020-03-23 21:05:48

2015-05-05

沙发

这个问题是由于表中主键未实现自增操作引起的。可以用两种方法修改（任选其一，不可多选）：

1.修改数据库主键规则。（推荐这种）
打开Microsoft SQL server Managermeng Studio，找到db_shop数据库，打开表-dbo.tb_member，右键这个表，选择“修改”，点中第一列“ID”，在下面列属性中“标识规范”-“（是标识）”一栏选“是”。

2.修改hibernate插入主键规则。
在数据库中创建主键序列表，脚本如下：
create table hi_value(id int);
insert into hi_value values(1);

修改hibernate中会员的映射文件TbMember.hbm.xml：
  <id name="id" type="java.lang.Integer">
            <column name="ID" />
            
            <generator class="hilo" >
            <param name="table">hi_value</param>
            <param name="column">id</param>
             <param name="max_lo">100</param>
            </generator>
        </id>

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