Hibernate会话保存

我尝试将主题添加到我的论坛，每次我创建一个论坛对象时我得到这个错误：Hibernate会话保存

HTTP Status 500 - 

type Exception report 

message 

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

exception 

org.hibernate.AssertionFailure: null id in com.versusfootball.hibernate.entity.ForumTopic 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) 
    com.versusfootball.dao.DAO.rollback(DAO.java:46) 
    com.versusfootball.dao.ForumTopicDAO.create(ForumTopicDAO.java:31) 
    com.versusfootball.struts.main.forum.SaveForumSubject.execute(SaveForumSubject.java:46) 
    sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
    sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) 
    sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) 
    java.lang.reflect.Method.invoke(Method.java:616) 
    com.opensymphony.xwork2.DefaultActionInvocation.invokeAction(DefaultActionInvocation.java:452) 
    com.opensymphony.xwork2.DefaultActionInvocation.invokeActionOnly(DefaultActionInvocation.java:291) 
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:254) 
    com.opensymphony.xwork2.interceptor.DefaultWorkflowInterceptor.doIntercept(DefaultWorkflowInterceptor.java:176) 
    com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98) 
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248) 
    com.opensymphony.xwork2.validator.ValidationInterceptor.doIntercept(ValidationInterceptor.java:263) 
    org.apache.struts2.interceptor.validation.AnnotationValidationInterceptor.doIntercept(AnnotationValidationInterceptor.java:68) 
    com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98) 
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248) 
    com.opensymphony.xwork2.interceptor.ConversionErrorInterceptor.intercept(ConversionErrorInterceptor.java:133) 
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248) 
    com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:207) 
    com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98) 
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248) 
    com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:207) 
    com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98) 
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248) 
    com.opensymphony.xwork2.interceptor.StaticParametersInterceptor.intercept(StaticParametersInterceptor.java:190) 
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248) 
    org.apache.struts2.interceptor.MultiselectInterceptor.intercept(MultiselectInterceptor.java:75) 
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248) 
    org.apache.struts2.interceptor.CheckboxInterceptor.intercept(CheckboxInterceptor.java:94) 
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248) 
    org.apache.struts2.interceptor.FileUploadInterceptor.intercept(FileUploadInterceptor.java:243) 
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248) 
    com.opensymphony.xwork2.interceptor.ModelDrivenInterceptor.intercept(ModelDrivenInterceptor.java:100) 
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248) 
    com.opensymphony.xwork2.interceptor.ScopedModelDrivenInterceptor.intercept(ScopedModelDrivenInterceptor.java:141) 
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248) 
    org.apache.struts2.interceptor.debugging.DebuggingInterceptor.intercept(DebuggingInterceptor.java:267) 
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248) 
    com.opensymphony.xwork2.interceptor.ChainingInterceptor.intercept(ChainingInterceptor.java:142) 
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248) 
    com.opensymphony.xwork2.interceptor.PrepareInterceptor.doIntercept(PrepareInterceptor.java:166) 
    com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98) 
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248) 
    com.opensymphony.xwork2.interceptor.I18nInterceptor.intercept(I18nInterceptor.java:176) 
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248) 
    org.apache.struts2.interceptor.ServletConfigInterceptor.intercept(ServletConfigInterceptor.java:164) 
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248) 
    com.opensymphony.xwork2.interceptor.AliasInterceptor.intercept(AliasInterceptor.java:190) 
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248) 
    com.opensymphony.xwork2.interceptor.ExceptionMappingInterceptor.intercept(ExceptionMappingInterceptor.java:187) 
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248) 
    org.apache.struts2.impl.StrutsActionProxy.execute(StrutsActionProxy.java:52) 
    org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:485) 
    org.apache.struts2.dispatcher.FilterDispatcher.doFilter(FilterDispatcher.java:395) 
    com.versusfootball.filters.InitSession.doFilter(InitSession.java:81) 
    com.versusfootball.filters.DisableUrlSessionFilter.doFilter(DisableUrlSessionFilter.java:87) 
note The full stack trace of the root cause is available in the Apache Tomcat/6.0.29 logs. 

Apache Tomcat/6.0.29

这里是我的论坛构造：

public Forum create (Forum forum) throws AppException { 
    try { 
     begin(); 
     if(forum.getId() != null) { 
      getSession().merge(forum); 
     } 
     else { 
      getSession().save(forum); 
     } 
     commit(); 
     close(); 
     return forum; 
    } 
    catch (HibernateException e) { 
     log.error("Error creating forum : " + e.getCause().getMessage()); 
     rollback(); 
     throw new AppException(e.getCause().getMessage()); 
    } 
}

这是我的提交执行：

package com.versusfootball.struts.main.forum; 

import java.util.Date; 

import javax.servlet.http.HttpServletRequest; 
import javax.servlet.http.HttpSession; 

import org.apache.log4j.Logger; 
import org.apache.struts2.interceptor.ServletRequestAware; 

import com.opensymphony.xwork2.ActionSupport; 
import com.versusfootball.dao.ForumDAO; 
import com.versusfootball.dao.ForumMessageDAO; 
import com.versusfootball.dao.ForumTopicDAO; 
import com.versusfootball.exceptions.AppException; 
import com.versusfootball.hibernate.entity.Forum; 
import com.versusfootball.hibernate.entity.ForumMessage; 
import com.versusfootball.hibernate.entity.ForumTopic; 
import com.versusfootball.hibernate.entity.Personne; 

public class SaveForumSubject extends ActionSupport implements ServletRequestAware { 
    /** 
    * 
    */ 
    private static final long serialVersionUID = -2131201082127318301L; 
    private static final Logger log = Logger.getLogger(SaveForumSubject.class); 

    public String execute() { 
     try { 
      HttpSession session = request.getSession(); 
      Personne usager = (Personne)session.getAttribute("usagerFoot"); 
      if(usager == null) { 
       return ERROR; 
      } 

      Date today = new Date(); 

      forum = forumDAO.getById(forumId); 
      ForumTopic newTopic = new ForumTopic(); 
      newTopic.setNbMessages(0); 
      newTopic.setNbViews(0); 
      newTopic.setForum(forum); 
      newTopic.setCreationDate(today); 
      newTopic.setTitle(msgTitle); 
      newTopic.setAuthor(usager); 
      newTopic = ftDAO.create(newTopic); 
      subjectId = newTopic.getId(); 
      ForumMessage newMsg = new ForumMessage(); 

      newMsg.setAuthor(usager);    
      newMsg.setMessageDate(today); 
      message = message.replaceAll("\n", "<br />"); 
      newMsg.setText(message);    
      newMsg.setTopic(newTopic); 
      newMsg.setNiveau(0); 
      newMsg = fmDAO.create(newMsg); 

      messageId = newMsg.getId(); 

      forum.setNbMessages(forum.getNbMessages() + 1); 
      forum.setNbTopics(forum.getNbTopics() + 1); 
      forum.setLastMessage(newMsg); 
      newTopic.setLastMessage(newMsg); 
      newTopic = ftDAO.create(newTopic); 

      forumDAO.create(forum); 

     } catch (AppException e) { 
      // TODO Auto-generated catch block 
      log.error(e.getMessage()); 
     } 
     return SUCCESS;  
    } 

    private ForumDAO forumDAO = new ForumDAO(); 
    private ForumMessageDAO fmDAO = new ForumMessageDAO(); 
    private ForumTopicDAO ftDAO = new ForumTopicDAO(); 

    private HttpServletRequest request; 

    private String msgTitle = ""; 
    private String message = ""; 
    private Integer forumId; 
    private Integer messageId; 
    private Integer subjectId; 

    private Forum forum; 

    public void setMsgTitle(String msgTitle) { 
     this.msgTitle = msgTitle; 
    } 
    public String getMsgTitle() { 
     return msgTitle; 
    } 

    public void setMessage(String message) { 
     this.message = message; 
    } 
    public String getMessage() { 
     return message; 
    } 

    public void setForumId(Integer forumId) { 
     this.forumId = forumId; 
    } 
    public Integer getForumId() { 
     return forumId; 
    } 

    public Integer getMessageId() { 
     return messageId; 
    } 

    public Forum getForum() { 
     return forum; 
    } 

    public Integer getSubjectId() { 
     return subjectId; 
    } 

    @Override 
    public void setServletRequest(HttpServletRequest request) { 
     this.request = request;   
    } 
}

有人有任何想法我可以解决这个问题吗？

来源

2012-10-29 CharleyXIV

通常在这些情况下，错误在于'Forum'类或映射。你可以添加它吗？ – madth3

从yout catch块调用rollback（）时发生异常。

在getSession().save(forum);或commit();调用中可能有例外。

（该消息是说该ID为空）。

无论如何，你只是通过记录getMessage()而不是整个例外来隐藏真正的例外。

尝试打印原始异常，以便可以找出发生了什么。

来源

2012-10-29 15:02:05 richardtz

好的，我将如何打印原始异常？ – CharleyXIV

尝试使用log.error（“创建论坛的错误：”，e）;就在rollback（）调用之前。 – richardtz

它还将帮助打印出sql（将show_sql config属性设置为true）。如果打印出来，在另一个数据库客户端运行它。 – Friso

您需要检查您的id（字段对应于主键）。它必须为空。你如何生成身份证？你有没有为它定义适当的策略？

来源

2012-10-30 06:24:37

Hibernate会话保存

回答

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