sql - 从grails项目中 hibernate AsserttionFailure

Question

我收到一个错误，该错误开始如下。这与我的级联的设置方式有关吗？在哪里开始调查的合适位置？现在，我有一个角色，其中有很多RoleDuty。 RoleDuty属于Role。 RoleDuty仅具有一个字段duty，该字段为可为空的字符串。角色具有RoleDuties列表的all-delete-orphan映射。

06.12.2010 10:02:17 *ERROR* AssertionFailure: an assertion failure occured (this may indicate a bug in Hibernate, but is
 more likely due to unsafe use of the session) (AssertionFailure.java, line 47)
org.hibernate.AssertionFailure: null id in RoleDuty entry (don't flush the Session after an exception occurs)
        at org.hibernate.event.def.DefaultFlushEntityEventListener.checkId(DefaultFlushEntityEventListener.java:78)
        at org.hibernate.event.def.DefaultFlushEntityEventListener.getValues(DefaultFlushEntityEventListener.java:187)
        at org.hibernate.event.def.DefaultFlushEntityEventListener.onFlushEntity(DefaultFlushEntityEventListener.java:14
3)
        at org.hibernate.event.def.AbstractFlushingEventListener.flushEntities(AbstractFlushingEventListener.java:219)
        at org.hibernate.event.def.AbstractFlushingEventListener.flushEverythingToExecutions(AbstractFlushingEventListen
er.java:99)
        at org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:49)
        at org.hibernate.impl.SessionImpl.flush(SessionImpl.java:1027)
        at org.springframework.orm.hibernate3.HibernateAccessor.flushIfNecessary(HibernateAccessor.java:390)
        at org.codehaus.groovy.grails.orm.hibernate.support.GrailsOpenSessionInViewInterceptor.flushIfNecessary(GrailsOp
enSessionInViewInterceptor.java:116)
        at org.springframework.orm.hibernate3.support.OpenSessionInViewInterceptor.postHandle(OpenSessionInViewIntercept
or.java:181)
        at org.codehaus.groovy.grails.orm.hibernate.support.GrailsOpenSessionInViewInterceptor.postHandle(GrailsOpenSess
ionInViewInterceptor.java:66)
        at org.springframework.web.servlet.handler.WebRequestHandlerInterceptorAdapter.postHandle(WebRequestHandlerInter
ceptorAdapter.java:61)
        at org.codehaus.groovy.grails.web.servlet.GrailsDispatcherServlet.doDispatch(GrailsDispatcherServlet.java:303)
        at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:719)
        at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:644)
        at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:560)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:647)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)

类定义:

class RoleDuty
{


  static belongsTo = [role:Role]

  static constraints = {
        duty(nullable: true)
  } 
    static mapping = {
          duty type:"text"
    }

  String duty;
  boolean _deleted
  static transients = ['_deleted']

  @XmlValue
  public String getDuty(){
    return duty;
  }


  String toString()
  {
      return duty;
  }

}


public class Role implements Comparable
{

    static belongsTo = [project:Project]
    static hasMany = [ roleDuties:RoleDuty]

    static mapping = {
        roleDuties cascade:"all-delete-orphan", lazy:false
    }

    List<RoleDuty> roleDuties = new ArrayList<RoleDuty>()


}

Answer 1

Hibernate的错误消息“发生异常后不要刷新 session ”表明该 session 上发生了与Hibernate相关的异常，但是您的代码捕获了该异常并继续使用该 session 。 Hibernate的API指出，如果Hibernate引发异常，则必须回滚事务/关闭Session并在新的Session中执行您想做的任何事情。

仅从此堆栈跟踪和调试Hibernate错误涉及试错就很难确切地说明问题是什么。我建议您在此代码之前查找异常时调试代码，并弄清楚如何避免它。