隨筆檔案

1、
org.springframework.orm.ObjectRetrievalFailureException: Object of class [com.xindeco.myregister.pojo.MyRegisterInfo] with identifier [14]: not found
MyRegisterInfo在數據庫沒有identifier [14]對象。


2、
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sessionFactory' defined in ServletContext resource [/WEB-INF/applicationContext.xml]: Initialization of bean failed; nested exception is org.hibernate.MappingException: Repeated column in mapping for entity: com.xindeco.myregister.pojo.MyRegisterInfo column: password (should be mapped with insert="false" update="false")

出錯原因：password 和repassword同時對應數據庫表中的password一列，同時update和insert都設為true。
xml文件如下：
??? <property name="password"
????????????????????????? type="java.lang.String"
????????????????????????? update="true"
????????????????????????? insert="true"
????????????????????????? access="property"
????????????????????????? column="password"
????????????????????????? length = "32"
????????????????????????? />

???????????????????????? <property name="repassword"
????????????????????????? type="java.lang.String"
????????????????????????? update="false"
????????????????????????? insert="false"
????????????????????????? access="property"
????????????????????????? column="password"
????????????????????????? length = "32"
????????????????????????? />
解決的方法：
將repassword的insert和update設為false。


3、
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sessionFactory' defined in ServletContext resource [/WEB-INF/applicationContext.xml]: Initialization of bean failed;
nested exception is org.hibernate.PropertyNotFoundException: Could not find a getter for ID in class

錯誤原因：hibernate的映射文件中ID是大寫的，而pojo的類中id是小寫的

注意事項：每個pojo的類都要繼承abstractEntity，其中abstractEntity類有個ID的屬性要重寫
?public abstract class AbstractEntity
??? implements Entity, BaseDTO {

??? abstract public long getID();

??? abstract public void setID(long id);

??? public int hashCode() {
??????? return (int)this.getID();
??? }

??? public boolean equals(Object obj) {
??????? if (obj == this) {
??????????? return true;
??????? }
??????? if (obj instanceof Entity) {
??????????? return this.getID() == ( (Entity) obj).getID();
??????? }
??????? return false;
??? }
}

4、
org.springframework.dao.InvalidDataAccessApiUsageException: Write operations are not allowed in read-only mode (FlushMode.NEVER) - turn your Session into FlushMode.AUTO or remove 'readOnly' marker from transaction definition

錯誤原因：
在application.xml文件中deleteRegister方法以delete開頭，并沒有被設定為可更改的，應如下設置：
?<!--為事物創建代理類，并指定方法的事物類型-->
? <bean id="baseTxProxy" lazy-init="true" abstract="true" class="org.springframework.transaction.interceptor.TransactionProxyFactoryBean">
??? <property name="transactionManager">
????? <ref bean="transactionManager"/>
??? </property>
??? <property name="transactionAttributes">
????? <props>
??????? <prop key="add*">PROPAGATION_REQUIRED</prop>
??????? <prop key="cancel*">PROPAGATION_REQUIRED</prop>
???????????</props>
??? </property>
? </bean>
加上一行
? <prop key="delete*">PROPAGATION_REQUIRED</prop>

5、
???ERROR org.apache.struts.util.RequestUtils - Error creating form bean of class com.xindeco.business.web.form.GraAppInfoForm

public class? GraAppInfoForm
extends ActionForm 錯誤寫成
public abstratic?class? GraAppInfoForm
extends ActionForm

6、
2006-04-25 08:56:38,495 ERROR com.xindeco.business.web.action.GraAppAction - com.xindeco.business.web.action.GraAppAction@8e2fb5
java.lang.ClassCastException: $Proxy0
?at com.xindeco.business.web.action.GraAppAction.newone(GraAppAction.java:30)
?at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
?at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
?at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
?at java.lang.reflect.Method.invoke(Method.java:585)
?at org.apache.struts.actions.DispatchAction.dispatchMethod(DispatchAction.java:274)
?at com.xindeco.core.web.action.BaseAction.dispatchMethod(BaseAction.java:153)
?at org.apache.struts.actions.DispatchAction.execute(DispatchAction.java:194)


actioin類中的newone方法如下：
public? class GraAppAction
??? extends BaseAction {
??? public ActionForward newone(ActionMapping mapping, ActionForm form,
????????????????????????????? HttpServletRequest request,
????????????????????????????? HttpServletResponse response) throws Exception {
???????GraAppService ?graservice = (GraAppService) this.getBean("GraAppService");
}

applicationcontext中的GraAppService的配置如下：
??? <bean id="GraAppDAO" class="com.xindeco.business.dao.impl.GraAppDAOImpl">
??? <property name="support">
????? <ref local="support"/>
??? </property>
??? <property name="sessionFactory">
????? <ref local="sessionFactory"/>
??? </property>
? </bean>
? <bean id="GraAppService" parent="baseTxProxy">
??? <property name="target">
????? <bean class="com.xindeco.business.service.impl.GraAppServiceImpl" autowire="byName">
??????? <property name="baseDAO">
????????? <ref bean="GraAppDAO"/>
??????? </property>
????? </bean>
??? </property>
? </bean>

因此this.getBean("GraAppService");是為了得到GraAppServicImpl類的實現。GraAppService是interface
public class GraAppServiceImpl extends BaseServiceImpl
??? implements GraAppService{
}

7、org.hibernate.hql.ast.QuerySyntaxException: Demand is not mapped. [from Demand where unitid = ? and needNum > usedNeedNum]

hibernate.cfg.xml沒有配置Demand.hbm.xml文件的目錄

8、org.springframework.jdbc.BadSqlGrammarException: Bad SQL grammar [] in task 'Hibernate operation'; nested exception is java.sql.SQLException: 列名 'id' 無效。
java.sql.SQLException: 列名 'name' 無效。

因為hibernate聲明的id，name的columnid屬性沒有與數據庫的字段對應，所以id，name無效。


9、java.lang.NumberFormatException: null
?at java.lang.Integer.parseInt(Integer.java:415)
?at java.lang.Integer.parseInt(Integer.java:497)
?at com.xindeco.business.service.impl.DemandServiceImpl.findDemandListByUnitId(DemandServiceImpl.java:33)

錯誤語句為
?needNum = Integer.parseInt(demand.getNeedNum());
?usedNeedNum = Integer.parseInt(demand.getUsedNeedNum());
因為demand.getUsedNeedNum()==null,無法轉化為string 類型，

10、rg.apache.jasper.JasperException: /GraAppInfo/GraAppInfoNew.jsp(343,29) According to TLD, tag bean:write must be empty, but is not

錯誤的原因：
????????????? <select name="politicsID" >
??????????? ?<option value="">請選擇</option>
?????? <logic:notEmpty name="politicsList">
??????????????? <logic:iterate id="politics" name="politicsList">
????????????????????????? </logic:notEmpty>
???????????<option value="<bean:write name="politics" property="codeID"/>"><bean:write name="politics" property="codeName"/></option>
????????? </logic:iterate>
?</select>
就因為少了/>
以后懂得通過查找字數，來檢查錯誤


11、2006-04-26 13:27:54,812 ERROR com.xindeco.core.util.BeanUtils - bean property [Nation] copy failed
com.xindeco.core.exception.ConvertException: org.springframework.orm.hibernate3.HibernateSystemException: Unknown entity: java.lang.String; nested exception is org.hibernate.MappingException: Unknown entity: java.lang.String

beanUtil.beanCopy(grapojo,form,BizConstants.CONVERTER);
要求：
1、pojo類的屬性只有與form屬性名字相同，才能beancopy成功
2、pojo中屬性是實體，在form中一定要用int，long表示
出現這錯誤的原因是pojo中的屬性不是實體，而錯誤寫成：
string
?private String nation;應改成 private?Syscode nation;

12、
2006-04-26 14:38:37,843 ERROR com.xindeco.business.web.action.GraAppAction - com.xindeco.business.web.action.GraAppAction@fa1b2d
java.lang.NullPointerException
?at com.xindeco.business.web.action.GraAppAction.newone(GraAppAction.java:43)
?at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
?at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)

hibernate配置文件沒改，程序找不到相應的類
??????? <many-to-one
??????????? name="FSUnit"
??????????? class="com.xindeco.business.pojo.EmployUnitBaseInfo"
??????????? cascade="none"
??????????? outer-join="auto"
??????????? update="true"
??????????? insert="true"
??????????? access="property"
??????????? column="fSUnit"
??????? />

其實FSUnit對應的類應該是FSUnit
??????? <many-to-one
??????????? name="FSUnit"
??????????? class="com.xindeco.business.pojo.FSUnit"
??????????? cascade="none"
??????????? outer-join="auto"
??????????? update="true"
??????????? insert="true"
??????????? access="property"
??????????? column="fSUnit"
??????? />

13、
org.hibernate.MappingException: An association from the table GraAppInfo refers to an unmapped class: com.xindeco.business.pojo.FSUnit

錯誤原因：hibernate.cfg.xml沒有配置fsunit.hbm.xml文件的位置

14、
java.lang.ClassCastException: com.xindeco.business.dao.impl.GraAppDAOImpl
at com.xindeco.business.service.impl.GraAppServiceImpl.addGraduateApp(GraAppServiceImpl.java:16)
GraAppServiceImpl.java:16
第16行： GraAppDAO dao = (GraAppDAO) this.getBaseDAO();//其實得到的是GraAppDAOImpl

錯誤的原因是
public class GraAppDAOImpl
??? extends BaseDAOImpl {

}
沒有實現GraAppDAO接口，正確的做法是
public class GraAppDAOImpl
??? extends BaseDAOImpl implements GraAppDAO {
}
先繼承后實現


15、2006-04-27 08:38:54,078 ERROR com.xindeco.business.web.action.GraAppAction - com.xindeco.business.web.action.GraAppAction@1d6399b
java.lang.ClassCastException: com.xindeco.business.pojo.SysCode
?at org.hibernate.type.StringType.set(StringType.java:26)
?at org.hibernate.type.NullableType.nullSafeSet(NullableType.java:63)
?at org.hibernate.type.NullableType.nullSafeSet(NullableType.java:40)

一般是因為hibernate聲明類型和pojo類聲明的類型不一樣，并且前面已經出現了Hibernate: insert into TGraAppInfo (name, whereFrom, degree, college, speciality, studentRelTel, remark, higherEduLength, highSchool, studyResume, normalOrNot, proxyUnit, workPost, workPlace, studentAddress, studentPostNumber, nation, appStatus) values (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
的操作提示，查出錯誤的原因有：
??????? <many-to-one
??????????? name="demand"
??????????? class="com.xindeco.business.pojo.Syscode"
??????????? cascade="none"
??????????? outer-join="auto"
??????????? update="true"
??????????? insert="true"
??????????? access="property"
??????????? column="demandID"
??????? />
???????? <property
??????????? name="appStatus"
??????????? type="int"
??????????? update="true"
??????????? insert="true"
??????????? access="property"
??????????? column="appStatus"
??????????? length="10"
??????? />
應改為????
??????? <many-to-one
??????????? name="demand"
??????????? class="com.xindeco.business.pojo.Demand"
??????????? cascade="none"
??????????? outer-join="auto"
??????????? update="true"
??????????? insert="true"
??????????? access="property"
??????????? column="demandID"
??????? />

??<many-to-one
??????????? name="nation"
??????????? class="com.xindeco.business.pojo.SysCode"
??????????? cascade="none"
??????????? outer-join="auto"
??????????? update="true"
??????????? insert="true"
??????????? access="property"
??????????? column="nation"
??????? />

16、
org.springframework.dao.InvalidDataAccessApiUsageException: object references an unsaved transient instance - save the transient instance before flushing: com.xindeco.business.pojo.SysCode
?at org.springframework.orm.hibernate3.SessionFactoryUtils.convertHibernateAccessException(SessionFactoryUtils.java:626)
?at org.springframework.orm.hibernate3.HibernateTransactionManager.convertHibernateAccessException(HibernateTransactionManager.java:570)
?at
org.springframework.orm.hibernate3.HibernateTransactionManager.doCommit(HibernateTransactionManager.java:482)




pojo類為：
public class GraAppInfo{
???????????? private College college;
}

action 類為
public class GraAppAction
??? extends BaseAction {
?????? public ActionForward add(ActionMapping mapping, ActionForm form,
???????????????????????????? HttpServletRequest request,
???????????????????????????? HttpServletResponse response) throws Exception {

????????graInfo.setCollege(new College());\\必須從數據庫找到college這個對象，而不能新生成
???????
??????? graInfo.getCollege().setID(graForm.getCollegeID());
??????? graInfo.setAppStatus(Integer.parseInt("0"));
??????service.addGraduateApp(graInfo)；
}

public class GraAppServiceImpl extends BaseServiceImpl
??? implements GraAppService{

??? public boolean addGraduateApp(GraAppInfo info)
??? {
??????? this.getBaseDAO().save(info);
??????? return true;
??? }
}
dao類save方法為
??? getHibernateTemplate().save(obj);

當cascade="all"，插入new college 除了id和原來的記錄一樣，其他的字段全部都被更新，為null
當cascase=“insert”，插入new college 只會把它的id插入grainfo表中，其他字段不變。

17、java.sql.SQLException: Unable to convert between java.lang.Integer and BLOB.
因為
??????? <property
??????????? name="province"
??????????? type="com.xindeco.business.pojo.SysCode"http://不能用復雜類，
??????????? update="true"
??????????? insert="true"
??????????? access="property"
??????????? column="provinceId"
??????? />
應該改為
??? ??????? <many-to-one
??????????? name="province"
??????????? class="com.xindeco.business.pojo.SysCode"
??????????? cascade="none"
??????????? outer-join="auto"
??????????? update="true"
??????????? insert="true"
??????????? access="property"
??????????? column="provinceId"
??????? />

18、javax.servlet.jsp.JspException: Cannot create iterator for this collection
?at org.apache.struts.taglib.logic.IterateTag.doStartTag(IterateTag.java:265)
jsp文件如下：
? ?<logic:notEmpty name="graduateList" >
? ?<logic:iterate id="graduate"? name="graduateList" >
?? </ogic:notEmpty >
?? </ogic:iterat>
graduateList是一個類，而logic:iterator要求必須是ArrayList,HashSet....這樣的集合類,而graduateList中一個屬性是ArrayList或HashSet的
應改為:
<logic:notEmpty name="graduateList" property="items">
?<logic:iterate id="graduate"? name="graduateList" property="items" >
?</ogic:notEmpty >
??</ogic:iterat>


19、2006-05-11 17:13:37,468 ERROR com.xindeco.business.web.action.GraAppAction - com.xindeco.business.web.action.GraAppAction@bc22eb
org.hibernate.LazyInitializationException: could not initialize proxy - the owning Session was closed

SysUser user= (SysUser) request.getSession().getAttribute(WebConstants.SESSION_USER);
??????? System.out.println(user.getRole().getRoleName());
當hibernate session取出數據放到http session時，
由于sysuser中role的lazy=“true”，所以沒有將RoleName放到http session中，當System.out.println(user.getRole().getRoleName());
時，雖然http session還開著， hibernat seesion已經關閉
??????? <many-to-one
??????????? name="role"
??????????? class="com.xindeco.business.pojo.SysRole"
??????????? lazy="false"
??????????? cascade="none"
??????????? outer-join="auto"
??????????? update="true"
??????????? insert="true"
??????????? access="property"
??????????? column="roleID"
??????? />
20、Association references unmapped class: com.xindeco.workflow.WFNode
因為application.xml文件中沒有配置<mapping resource="com/xindeco/workflow/WFNode.hbm.xml"/>
系統找不到WFNode

??????? < set
????????????name = " nodes "
????????????table = " WF_ROLENODES "
????????????lazy = " true "
????????????inverse = " false "
????????????cascade = " none "
????????????sort = " unsorted "
???????? >

?????????????? < key
??????????????????column = " roleID "
?????????????? >
?????????????? </ key >

????????????????? < many - to - many
?????????????????? class = " com.xindeco.workflow.WFNode "
??????????????????column = " nodeId "
??????????????????outer - join = " auto "
??????????????? />
???????????????

???????? </ set >