mysql - org.hibernate.AssertionFailure : null id in entry (don't flush the Session after an exception occurs)

Question

我有一个 hibernate 和 JSF2 应用程序进入部署服务器并突然抛出 org.hibernate.AssertionFailure: null id in exception。我将立即提供堆栈跟踪和代码，但首先有四个重要问题:

1. 这只发生在部署服务器上(Jboss 和 MySql 在 Windows Sever 2008 上运行。)它不会发生在我的开发机器上(Tomcat 和 MySql 运行在 Windoes 7 Pro 上)，也不会发生在暂存环境( Jboss 和 MySql 在 Linux 上运行。)

2. 对此进行研究，似乎人们在尝试插入对象时会出现此错误。但是当我做一个简单的查询时我得到了错误。 (实际上是各种不同的查询，因为错误随机出现在几个页面上。)

3. 错误只是偶尔发生。如果我重新启动 Jboss，它会消失，但稍后会返回。此外，它并不一致，在某些点击时它在那里，在其他点击时则不是。即使它命中，当我对页面进行简单刷新时，它也能正常返回。

4. 我正在使用 c3p0(配置如下)

知道发生了什么吗？

代码详情:

这发生在地址对象上。这是完整的hbm:

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping package="com.idex.auctions.model">
<class name="Address" table="address" lazy="true">
  <id name="addressID" column="AddressID">
        <generator class="native"/>            
  </id>

  <property name="street" column="street"/> 
  <property name="city" column="city"/> 
  <property name="zip" column="zip"/> 
  <property name="state" column="state"/> 
  <property name="region" column="region"/> 
  <property name="country" column="country"/> 

  <many-to-one name="user" 
       class="com.idex.auctions.model.User" 
       column="userid" 
       unique="true" 
       cascade="save-update"/>
 </class> 
</hibernate-mapping>

Java 类是直截了当的:

public class Address implements Serializable {
private static final long serialVersionUID = 7485582614444496906L;

private long addressID;
private String street;
private String city;
private String zip;
private String state;
private String region;
private String country;
private User user;

public Address() {

}
public long getAddressID() {
    return addressID;
}
public void setAddressID(long addressID) {
    this.addressID = addressID;
}
public String getStreet() {
    return street;
}
public void setStreet(String street) {
    this.street = street;
}
public String getCity() {
    return city;
}
public void setCity(String city) {
    this.city = city;
}
public String getZip() {
    return zip;
}
public void setZip(String zip) {
    this.zip = zip;
}
public String getState() {
    return state;
}
public void setState(String state) {
    this.state = state;
}
public String getRegion() {
    return region;
}
public void setRegion(String region) {
    this.region = region;
}
public String getCountry() {
    return country;
}
public void setCountry(String country) {
    this.country = country;
}
public User getUser() {
    return user;
}
public void setUser(User user) {
    this.user = user;
}

}

c3p0配置:

<property name="hibernate.c3p0.acquire_increment">1</property> 
<property name="hibernate.c3p0.idle_test_period">1000</property> 
<property name="hibernate.c3p0.max_size">20</property>  
<property name="hibernate.c3p0.min_size">5</property>
<property name="hibernate.c3p0.timeout">1800</property>
<property name="hibernate.c3p0.max_statements">0</property>
<property name="connection.provider_class">org.hibernate.connection.C3P0ConnectionProvider</property>

使用的版本是

hibernate3.jar

c3p0-0.9.1.2.jar

myfaces-api-2.1.4.jar

myfaces-impl-2.1.4.jar

mysql-connector-java-5.1.20-bin.jar

完整的堆栈跟踪

org.hibernate.AssertionFailure: null id in com.idex.auctions.model.Address entry 
    (don't flush the Session after an exception occurs)
org.hibernate.event.def.DefaultFlushEntityEventListener.checkId(
                                          DefaultFlushEntityEventListener.java:78)
org.hibernate.event.def.DefaultFlushEntityEventListener.getValues(
                                          DefaultFlushEntityEventListener.java:187)
org.hibernate.event.def.DefaultFlushEntityEventListener.onFlushEntity(
                                          DefaultFlushEntityEventListener.java:143)
org.hibernate.event.def.AbstractFlushingEventListener.flushEntities(
                                          AbstractFlushingEventListener.java:219)
org.hibernate.event.def.AbstractFlushingEventListener.flushEverythingToExecutions(
                                          AbstractFlushingEventListener.java:99)
org.hibernate.event.def.DefaultAutoFlushEventListener.onAutoFlush(
                                          DefaultAutoFlushEventListener.java:58)
org.hibernate.impl.SessionImpl.autoFlushIfRequired(SessionImpl.java:997)
org.hibernate.impl.SessionImpl.list(SessionImpl.java:1142)
org.hibernate.impl.QueryImpl.list(QueryImpl.java:102)
com.idex.auctions.manager.DatabaseManager.getAllObjects(DatabaseManager.java:464)
com.idex.auctions.ui.NavBean.gotoHome(NavBean.java:40)
sun.reflect.GeneratedMethodAccessor350.invoke(Unknown Source)
sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
java.lang.reflect.Method.invoke(Unknown Source)
javax.el.BeanELResolver.invokeMethod(BeanELResolver.java:735)
javax.el.BeanELResolver.invoke(BeanELResolver.java:467)
javax.el.CompositeELResolver.invoke(CompositeELResolver.java:246)
org.apache.el.parser.AstValue.getValue(AstValue.java:159)
org.apache.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:189)
org.apache.myfaces.view.facelets.el.ContextAwareTagValueExpression.getValue(
                                          ContextAwareTagValueExpression.java:96)
javax.faces.component._DeltaStateHelper.eval(_DeltaStateHelper.java:246)
javax.faces.component.UIOutcomeTarget.getOutcome(UIOutcomeTarget.java:50)
org.apache.myfaces.shared.renderkit.html.HtmlRendererUtils.getOutcomeTargetHref(
                                          HtmlRendererUtils.java:1542)
org.apache.myfaces.shared.renderkit.html.HtmlLinkRendererBase.renderOutcomeLinkStart(
                                          HtmlLinkRendererBase.java:908)
org.apache.myfaces.shared.renderkit.html.HtmlLinkRendererBase.encodeBegin(
                                          HtmlLinkRendererBase.java:143)
javax.faces.component.UIComponentBase.encodeBegin(UIComponentBase.java:502)
javax.faces.component.UIComponent.encodeAll(UIComponent.java:744)
javax.faces.component.UIComponent.encodeAll(UIComponent.java:758)
javax.faces.component.UIComponent.encodeAll(UIComponent.java:758)
org.apache.myfaces.view.facelets.FaceletViewDeclarationLanguage.renderView(
                                    FaceletViewDeclarationLanguage.java:1900)
org.apache.myfaces.application.ViewHandlerImpl.renderView(ViewHandlerImpl.java:285)
com.ocpsoft.pretty.faces.application.PrettyViewHandler.renderView(
                                    PrettyViewHandler.java:163)
javax.faces.application.ViewHandlerWrapper.renderView(ViewHandlerWrapper.java:59)
org.apache.myfaces.tomahawk.application.ResourceViewHandlerWrapper.renderView(
                                    ResourceViewHandlerWrapper.java:93)
com.idex.auctions.ui.CustomViewHandler.renderView(CustomViewHandler.java:98)
org.apache.myfaces.lifecycle.RenderResponseExecutor.execute(RenderResponseExecutor.java:115)
org.apache.myfaces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:241)
javax.faces.webapp.FacesServlet.service(FacesServlet.java:199)
com.ocpsoft.pretty.PrettyFilter.doFilter(PrettyFilter.java:126)
com.ocpsoft.pretty.PrettyFilter.doFilter(PrettyFilter.java:118)

Answer 1

异常(exception):

org.hibernate.AssertionFailure: null id in entry (don't flush the Session after an exception occurs)

告诉我们 session 异常已经发生在这个 org.hibernate.AssertionFailure 被抛出的点之前。

确切地说，org.hibernate.AssertionFailure 是在 session.flush() 发生时抛出的，而不是发生错误的地方。

以上是事实，因此可能得出的结论是:某些东西可能会抑制原来的异常。

所以寻找其他可能的错误点:save() 或 saveOrUpdate() 可能试图持久化一个具有 null 字段的实体，其中，在表中，列是 NOT NULL？

---

提示:为了帮助调试，请尝试在每次与 Session 对象交互后添加一个 session.flush()(例如 session.save(obj) , session.merge(obj) 等)，这有望导致 org.hibernate.AssertionFailure 更早发生，更接近真正问题发生的地方。 (当然调试完后，去掉那些session.flush()。)

就我而言，real 异常发生在 try/catch {} block 内，其中 catch 抑制了异常(没有重新抛出或警告我)。