我遇到了Hibernate映射的问题，我知道有很多关于这个主题的帖子，而且我读了很多这些帖子，但我仍然无法解决它。
对于在Integer上映射的字段，我有一个NULL值，当我执行select时，我收到此错误：
Mar 3, 2016 4:11:24 PM org.apache.catalina.core.StandardWrapperValve invoke
SEVERE: Servlet.service() for servlet Faces Servlet threw exception
java.lang.IllegalArgumentException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:622)
at org.hibernate.property.BasicPropertyAccessor$BasicSetter.set(BasicPropertyAccessor.java:66)
at org.hibernate.tuple.entity.AbstractEntityTuplizer.setPropertyValues(AbstractEntityTuplizer.java:583)
at org.hibernate.tuple.entity.PojoEntityTuplizer.setPropertyValues(PojoEntityTuplizer.java:229)
at org.hibernate.persister.entity.AbstractEntityPersister.setPropertyValues(AbstractEntityPersister.java:3848)
at org.hibernate.engine.TwoPhaseLoad.initializeEntity(TwoPhaseLoad.java:152)
at org.hibernate.loader.Loader.initializeEntitiesAndCollections(Loader.java:982)
at org.hibernate.loader.Loader.doQuery(Loader.java:857)
at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:274)
at org.hibernate.loader.Loader.doList(Loader.java:2542)
at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2276)
at org.hibernate.loader.Loader.list(Loader.java:2271)
at org.hibernate.loader.criteria.CriteriaLoader.list(CriteriaLoader.java:119)
at org.hibernate.impl.SessionImpl.list(SessionImpl.java:1716)
at org.hibernate.impl.CriteriaImpl.list(CriteriaImpl.java:347)
at com.squire.svi.billing.dao.BillingItemDAO.fetch(BillingItemDAO.java:42)
at com.squire.svi.billing.model.BillingItemModel.updateDataFromDatabase(BillingItemModel.java:191)
at com.squire.svi.billing.model.BillingItemModel.fetchData(BillingItemModel.java:121)
at com.squire.svi.billing.model.BillingItemModelFactory.getBillingItemModel(BillingItemModelFactory.java:212)
at com.squire.svi.billing.BillingMgr.setBillingItemModel(BillingMgr.java:1339)
at com.squire.svi.billing.BillingMgr.doBillingTableLink(BillingMgr.java:1324)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:622)
at org.apache.el.parser.AstValue.invoke(AstValue.java:172)
at org.apache.el.MethodExpressionImpl.invoke(MethodExpressionImpl.java:276)
at com.sun.facelets.el.TagMethodExpression.invoke(TagMethodExpression.java:68)
at javax.faces.component._MethodExpressionToMethodBinding.invoke(_MethodExpressionToMethodBinding.java:78)
at org.apache.myfaces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:57)
at javax.faces.component.UICommand.broadcast(UICommand.java:127)
at org.ajax4jsf.component.AjaxActionComponent.broadcast(AjaxActionComponent.java:55)
at org.ajax4jsf.component.AjaxViewRoot.processEvents(AjaxViewRoot.java:329)
at org.ajax4jsf.component.AjaxViewRoot.broadcastEventsForPhase(AjaxViewRoot.java:304)
at org.ajax4jsf.component.AjaxViewRoot.processPhase(AjaxViewRoot.java:261)
at org.ajax4jsf.component.AjaxViewRoot.processApplication(AjaxViewRoot.java:474)
at org.apache.myfaces.lifecycle.InvokeApplicationExecutor.execute(InvokeApplicationExecutor.java:32)
at org.apache.myfaces.lifecycle.LifecycleImpl.executePhase(LifecycleImpl.java:103)
at org.apache.myfaces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:76)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:183)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.ajax4jsf.webapp.BaseXMLFilter.doXmlFilter(BaseXMLFilter.java:206)
at org.ajax4jsf.webapp.BaseFilter.handleRequest(BaseFilter.java:290)
at org.ajax4jsf.webapp.BaseFilter.processUploadsAndHandleRequest(BaseFilter.java:388)
at org.ajax4jsf.webapp.BaseFilter.doFilter(BaseFilter.java:515)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)
at org.apache.jk.server.JkCoyoteHandler.invoke(JkCoyoteHandler.java:190)
at org.apache.jk.common.HandlerRequest.invoke(HandlerRequest.java:291)
at org.apache.jk.common.ChannelSocket.invoke(ChannelSocket.java:769)
at org.apache.jk.common.ChannelSocket.processConnection(ChannelSocket.java:698)
at org.apache.jk.common.ChannelSocket$SocketConnection.runIt(ChannelSocket.java:891)
at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:690)
at java.lang.Thread.run(Thread.java:701)
以下是映射：
<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
<!-- Generated 14-Feb-2011 16:39:32 by Hibernate Tools 3.2.5.Beta -->
<hibernate-mapping>
<class name="com.squire.svi.billing.Routing" table="Routing" lazy="false">
[...]
<property name="timeOfDayGroupId" type="java.lang.Integer" not-null="false" length="5">
<column name="TODGroupId" default="0" />
</property>
[...]
</class>
</hibernate-mapping>
该表如下，映射列是最后一列：
mysql> describe Routing;
+-----------------+------------------+------+-----+---------+----------------+
| Field | Type | Null | Key | Default | Extra |
+-----------------+------------------+------+-----+---------+----------------+
| Id | int(10) unsigned | NO | PRI | NULL | auto_increment |
| Prefix | varchar(30) | NO | MUL | NULL | |
| Route | int(10) unsigned | NO | MUL | NULL | |
| Cost | decimal(13,4) | YES | MUL | 0.0000 | |
| Priority | int(10) | YES | MUL | 0 | |
| Loadshare | tinyint(1) | YES | | 0 | |
| LoadBalance | tinyint(1) | YES | MUL | 0 | |
| OnNet | tinyint(1) | YES | | 0 | |
| country_code | varchar(40) | YES | | NULL | |
| routing_info | varchar(40) | YES | | NULL | |
| Outgoing_Format | varchar(40) | YES | | NULL | |
| RoutePlanId | int(10) unsigned | YES | | NULL | |
| EnableTBR | tinyint(1) | YES | | 0 | |
| TODGroupId | int(5) | YES | | NULL | |
+-----------------+------------------+------+-----+---------+----------------+
mysql> select * from Routing;
+----+--------+-------+--------+----------+-----------+-------------+-------+--------------+--------------+-----------------+-------------+-----------+------------+
| Id | Prefix | Route | Cost | Priority | Loadshare | LoadBalance | OnNet | country_code | routing_info | Outgoing_Format | RoutePlanId | EnableTBR | TODGroupId |
+----+--------+-------+--------+----------+-----------+-------------+-------+--------------+--------------+-----------------+-------------+-----------+------------+
| 2 | ewqe | 2 | 0.0000 | 0 | 0 | 0 | NULL | NULL | NULL | NULL | NULL | 1 | NULL |
| 7 | 0% | 2 | 0.0000 | 2 | 0 | 0 | NULL | NULL | NULL | NULL | NULL | 0 | 0 |
+----+--------+-------+--------+----------+-----------+-------------+-------+--------------+--------------+-----------------+-------------+-----------+------------+
2 rows in set (0.00 sec)
我的bean上的setter如下：
private Integer timeOfDayGroupId;
public void setTimeOfDayGroupId(Integer timeOfDayGroupId) {
LoggingManager.logGeneral("setTimeOfDayGroupId "+timeOfDayGroupId);
if(null != timeOfDayGroupId){
this.timeOfDayGroupId = timeOfDayGroupId;
}else{
this.timeOfDayGroupId = 0;
}
LoggingManager.logGeneral("timeOfDayGroupId "+this.timeOfDayGroupId);
}
我也尝试使用int作为参数。 但是第一行的日志记录从未被调用过，我首先得到了异常
如果我将TODGroupId值设置为0，那么它可以正常工作。所以这个NULL就是问题。
欢迎任何想法。
由于
编辑：实体类
package com.squire.svi.billing;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;
import javax.faces.model.SelectItem;
import org.apache.commons.lang.builder.ToStringBuilder;
import com.squire.svi.cache.Cacheable;
import com.squire.svi.logging.LoggingManager;
import com.squire.svi.util.StringSortable;
public class Routing extends SelectItem implements Serializable, BillingItem,
Cacheable<String>, StringSortable {
private static final long serialVersionUID = 1L;
/** identifier field */
private Integer id;
/** persistent field */
private String prefix; // also used as the name for this object
/** persistent field, this is shown as the route on the display */
private com.squire.svi.billing.Customer customer;
private Double cost;
private Integer priority;
private Integer percentage;
private Double quality;
private String routeBy;
private Boolean loadshare;
private Boolean onNet;
private boolean enableTBR;
private Integer timeOfDayGroupId;
private com.squire.svi.billing.Routeplan routeplan;
public Boolean getLoadshare() {
return loadshare;
}
public Boolean isLoadshare() {
return loadshare;
}
public void setLoadshare(Boolean loadshare) {
this.loadshare = loadshare;
}
public boolean getEnableTBR() {
return isEnableTBR();
}
public boolean isEnableTBR() {
return enableTBR;
}
public void setEnableTBR(boolean enableTBR) {
this.enableTBR = enableTBR;
}
public int getTimeOfDayGroupId() {
LoggingManager.logGeneral("getTimeOfDayGroupId "+timeOfDayGroupId);
return timeOfDayGroupId;
}
public void setTimeOfDayGroupId(Integer timeOfDayGroupId) {
LoggingManager.logGeneral("setTimeOfDayGroupId integer "+timeOfDayGroupId);
if(null != timeOfDayGroupId){
this.timeOfDayGroupId = timeOfDayGroupId;
}else{
this.timeOfDayGroupId = 0;
}
LoggingManager.logGeneral("timeOfDayGroupId "+this.timeOfDayGroupId);
}
[...]
}
编辑：从映射中删除默认值后，我仍然有同样的错误。
<property name="timeOfDayGroupId" type="java.lang.Integer" not-null="false" length="5">
<column name="TODGroupId" />
</property>
再次编辑：以这种方式编写映射
<property name="timeOfDayGroupId" type="integer">
<column name="TODGroupId" not-null="false" default="null" />
</property>
感谢newohybat。
答案 0 :(得分：0)
从数据库反序列化实体并调用实体的setter时抛出异常。
我怀疑Hibernate不期望数据库中有NULL值，因为它依赖于在INSERT上插入默认值的事实。这必须在数据库中得到保证。
所以我的建议是在从Hibernate查询之前让表进入预期状态（默认值而不是NULL）。