几个错误的解决关键
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导读:
1、
org.springframework.orm.ObjectRetrievalFailureException: Object of class [com.xindeco.myregister.pojo.MyRegisterInfo] with identifier [14]: not found
MyRegisterInfo在数据库没有identifier [14]对象。
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")
出错原因:password 和repassword同时对应数据库表中的password一列,同时update和insert都设为true。
xml文件如下:
type="java.lang.String"
update="true"
insert="true"
access="property"
column="password"
length = "32"
/> type="java.lang.String"
update="true"
insert="true"
access="property"
column="password"
length = "32"
/>
type="java.lang.String"
update="false"
insert="false"
access="property"
column="password"
length = "32"
/> type="java.lang.String"
update="false"
insert="false"
access="property"
column="password"
length = "32"
/>
解决的方法:
将repassword的insert和update设为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
错误原因:hibernate的映射文件中ID是大写的,而pojo的类中id是小写的
注意事项:每个pojo的类都要继承abstractEntity,其中abstractEntity类有个ID的属性要重写
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
错误原因:
在application.xml文件中deleteRegister方法以delete开头,并没有被设定为可更改的,应如下设置:
PROPAGATION_REQUIRED
PROPAGATION_REQUIRED
加上一行
PROPAGATION_REQUIRED
5、
ERROR org.apache.struts.util.RequestUtils - Error creating form bean of class com.xindeco.business.web.form.GraAppInfoForm
public class GraAppInfoForm
extends ActionForm 错误写成
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类中的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:
因此this.getBean("GraAppService");是为了得到GraAppServicImpl类的实现。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没有配置Demand.hbm.xml文件的目录
8、org.springframework.jdbc.BadSqlGrammarException: Bad SQL grammar [] in task 'Hibernate operation'; nested exception is java.sql.SQLException: 列名 'id' 无效。
java.sql.SQLException: 列名 'name' 无效。
因为hibernate声明的id,name的columnid属性没有与数据库的字段对应,所以id,name无效。
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)
错误语句为
needNum = Integer.parseInt(demand.getNeedNum());
usedNeedNum = Integer.parseInt(demand.getUsedNeedNum());
因为demand.getUsedNeedNum()==null,无法转化为string 类型,
10、rg.apache.jasper.JasperException: /GraAppInfo/GraAppInfoNew.jsp(343,29) According to TLD, tag bean:write must be empty, but is not
错误的原因:
就因为少了/>
以后懂得通过查找字数,来检查错误
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类的属性只有与form属性名字相同,才能beancopy成功
2、pojo中属性是实体,在form中一定要用int,long表示
出现这错误的原因是pojo中的属性不是实体,而错误写成:
string
private String nation;应改成 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配置文件没改,程序找不到相应的类
name="FSUnit"
class="com.xindeco.business.pojo.EmployUnitBaseInfo"
cascade="none"
outer-join="auto"
update="true"
insert="true"
access="property"
column="fSUnit"
/> name="FSUnit"
class="com.xindeco.business.pojo.EmployUnitBaseInfo"
cascade="none"
outer-join="auto"
update="true"
insert="true"
access="property"
column="fSUnit"
/>
其实FSUnit对应的类应该是FSUnit
name="FSUnit"
class="com.xindeco.business.pojo.FSUnit"
cascade="none"
outer-join="auto"
update="true"
insert="true"
access="property"
column="fSUnit"
/> 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
错误原因:hibernate.cfg.xml没有配置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();//其实得到的是GraAppDAOImpl
错误的原因是
public class GraAppDAOImpl
extends BaseDAOImpl {
}
没有实现GraAppDAO接口,正确的做法是
public class GraAppDAOImpl
extends BaseDAOImpl implements GraAppDAO {
}
先继承后实现
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)
一般是因为hibernate声明类型和pojo类声明的类型不一样,并且前面已经出现了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,查出错误的原因有:
name="demand"
class="com.xindeco.business.pojo.Syscode"
cascade="none"
outer-join="auto"
update="true"
insert="true"
access="property"
column="demandID"
/> name="demand"
class="com.xindeco.business.pojo.Syscode"
cascade="none"
outer-join="auto"
update="true"
insert="true"
access="property"
column="demandID"
/>
name="appStatus"
type="int"
update="true"
insert="true"
access="property"
column="appStatus"
length="10"
/> name="appStatus"
type="int"
update="true"
insert="true"
access="property"
column="appStatus"
length="10"
/>
应改为
name="demand"
class="com.xindeco.business.pojo.Demand"
cascade="none"
outer-join="auto"
update="true"
insert="true"
access="property"
column="demandID"
/> name="demand"
class="com.xindeco.business.pojo.Demand"
cascade="none"
outer-join="auto"
update="true"
insert="true"
access="property"
column="demandID"
/>
name="nation"
class="com.xindeco.business.pojo.SysCode"
cascade="none"
outer-join="auto"
update="true"
insert="true"
access="property"
column="nation"
/> 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类为:
public class GraAppInfo{
private College college;
}
action 类为
public class GraAppAction
extends BaseAction {
public ActionForward add(ActionMapping mapping, ActionForm form,
HttpServletRequest request,
HttpServletResponse response) throws Exception {
graInfo.setCollege(new College());//必须从数据库找到college这个对象,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类save方法为
getHibernateTemplate().save(obj);
当cascade="all",插入new college 除了id和原来的记录一样,其他的字段全部都被更新,为null
当cascase=“insert”,插入new college 只会把它的id插入grainfo表中,其他字段不变。
17、java.sql.SQLException: Unable to convert between java.lang.Integer and BLOB.
因为
name="province"
type="com.xindeco.business.pojo.SysCode"//不能用复杂类,
update="true"
insert="true"
access="property"
column="provinceId"
/> name="province"
type="com.xindeco.business.pojo.SysCode"//不能用复杂类,
update="true"
insert="true"
access="property"
column="provinceId"
/>
应该改为
name="province"
class="com.xindeco.business.pojo.SysCode"
cascade="none"
outer-join="auto"
update="true"
insert="true"
access="property"
column="provinceId"
/> 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:
graduateList是一个类,而logic:iterator要求必须是ArrayList,HashSet....这样的集合类,而graduateList中一个属性是ArrayList或HashSet的
应改为:
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());
当hibernate session取出数据放到http session时,
由于sysuser中role的lazy=“true”,所以没有将RoleName放到http session中,当System.out.println(user.getRole().getRoleName());
时,虽然http session还开着, hibernat seesion已经关闭
name="role"
class="com.xindeco.business.pojo.SysRole"
lazy="false"
cascade="none"
outer-join="auto"
update="true"
insert="true"
access="property"
column="roleID"
/> 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
因为application.xml文件中没有配置
系统找不到WFNode
name = "nodes "
table = "WF_ROLENODES "
lazy = "true "
inverse = "false "
cascade = "none "
sort = "unsorted "
> name = "nodes "
table = "WF_ROLENODES "
lazy = "true "
inverse = "false "
cascade = "none "
sort = "unsorted "
>
column = "roleID "
> column = "roleID "
>
key >
class = "com.xindeco.workflow.WFNode "
column = "nodeId "
outer - join = "auto "
/> class = "com.xindeco.workflow.WFNode "
column = "nodeId "
outer - join = "auto "
/>
set >
12:45 | 永久链接 | 浏览 (184) | 评论 (0) | struts |
logic:Iterator标签(以下简称“该标签”)是Struts里非常常用的一个标签,其作用在于循环显示给定容器对象中的值。
如此常用的标签,其源代码当然需要拿出来研究一下,以下列举几条研究成果:
1、该标签内部使用Collection来表示给定的容器,所有的给定容器对象(如ArrayList,Map等)都会被其转化成为Collection,Collection实际就是Map和List的父类。
2、该标签自己维护循环索引,不用程序员管理索引
3、该标签常见的几个属性如下:name、property、scope、id
对应Struts给出的Api说明如下:
name:包括要遍历Collection的Jsp页面的bean的名字(如果property没有被定义),或者是那些通过getter方法获得属性的Jsp中的Bean的名字,这些getter方法返回的是Collection(如果property定义了)。
property:在name命名的Jsp bean中定义的属性的名字,通过getter方法返回一个Collection
scope:指示到哪里去寻找name为名字的bean,如果没有定义缺省为"any scope"
id:如果Collection非空的话,在每次遍历时候Collection中每个元素的名字。
其中除了id每个元素均为Rt expr,这儿的rt expr的意思就是Run Time Expression。明确的说就是,如果你对一个Attribute的指定为true,你就可以在这样的属性中使用<%=%>之类的东东。这个配置文件在tld中。
只有id是必须要说明的。
关于Api说明的说明:
id只是一个临时标识,在下面的
举例说明
以下代码生成一个阶梯状表格
系统 资源 操作
soft3
res3
opt3
soft12
res12
opt1211
soft11
res11
opt1111
在此之前传来一个request.getAttribute("userPurview"),所以有在第一个logic中的userPurview,就是在这个request里面寻找userPurview
返回的是一个list
> 系统
1、
org.springframework.orm.ObjectRetrievalFailureException: Object of class [com.xindeco.myregister.pojo.MyRegisterInfo] with identifier [14]: not found
MyRegisterInfo在数据库没有identifier [14]对象。
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")
出错原因:password 和repassword同时对应数据库表中的password一列,同时update和insert都设为true。
xml文件如下:
update="true"
insert="true"
access="property"
column="password"
length = "32"
/> type="java.lang.String"
update="true"
insert="true"
access="property"
column="password"
length = "32"
/>
update="false"
insert="false"
access="property"
column="password"
length = "32"
/> type="java.lang.String"
update="false"
insert="false"
access="property"
column="password"
length = "32"
/>
解决的方法:
将repassword的insert和update设为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
错误原因:hibernate的映射文件中ID是大写的,而pojo的类中id是小写的
注意事项:每个pojo的类都要继承abstractEntity,其中abstractEntity类有个ID的属性要重写
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
错误原因:
在application.xml文件中deleteRegister方法以delete开头,并没有被设定为可更改的,应如下设置:
加上一行
5、
ERROR org.apache.struts.util.RequestUtils - Error creating form bean of class com.xindeco.business.web.form.GraAppInfoForm
public class GraAppInfoForm
extends ActionForm 错误写成
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类中的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:
因此this.getBean("GraAppService");是为了得到GraAppServicImpl类的实现。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没有配置Demand.hbm.xml文件的目录
8、org.springframework.jdbc.BadSqlGrammarException: Bad SQL grammar [] in task 'Hibernate operation'; nested exception is java.sql.SQLException: 列名 'id' 无效。
java.sql.SQLException: 列名 'name' 无效。
因为hibernate声明的id,name的columnid属性没有与数据库的字段对应,所以id,name无效。
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)
错误语句为
needNum = Integer.parseInt(demand.getNeedNum());
usedNeedNum = Integer.parseInt(demand.getUsedNeedNum());
因为demand.getUsedNeedNum()==null,无法转化为string 类型,
10、rg.apache.jasper.JasperException: /GraAppInfo/GraAppInfoNew.jsp(343,29) According to TLD, tag bean:write must be empty, but is not
错误的原因:
就因为少了/>
以后懂得通过查找字数,来检查错误
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类的属性只有与form属性名字相同,才能beancopy成功
2、pojo中属性是实体,在form中一定要用int,long表示
出现这错误的原因是pojo中的属性不是实体,而错误写成:
string
private String nation;应改成 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配置文件没改,程序找不到相应的类
class="com.xindeco.business.pojo.EmployUnitBaseInfo"
cascade="none"
outer-join="auto"
update="true"
insert="true"
access="property"
column="fSUnit"
/> name="FSUnit"
class="com.xindeco.business.pojo.EmployUnitBaseInfo"
cascade="none"
outer-join="auto"
update="true"
insert="true"
access="property"
column="fSUnit"
/>
其实FSUnit对应的类应该是FSUnit
class="com.xindeco.business.pojo.FSUnit"
cascade="none"
outer-join="auto"
update="true"
insert="true"
access="property"
column="fSUnit"
/> 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
错误原因:hibernate.cfg.xml没有配置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();//其实得到的是GraAppDAOImpl
错误的原因是
public class GraAppDAOImpl
extends BaseDAOImpl {
}
没有实现GraAppDAO接口,正确的做法是
public class GraAppDAOImpl
extends BaseDAOImpl implements GraAppDAO {
}
先继承后实现
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)
一般是因为hibernate声明类型和pojo类声明的类型不一样,并且前面已经出现了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,查出错误的原因有:
class="com.xindeco.business.pojo.Syscode"
cascade="none"
outer-join="auto"
update="true"
insert="true"
access="property"
column="demandID"
/> name="demand"
class="com.xindeco.business.pojo.Syscode"
cascade="none"
outer-join="auto"
update="true"
insert="true"
access="property"
column="demandID"
/>
type="int"
update="true"
insert="true"
access="property"
column="appStatus"
length="10"
/> name="appStatus"
type="int"
update="true"
insert="true"
access="property"
column="appStatus"
length="10"
/>
应改为
class="com.xindeco.business.pojo.Demand"
cascade="none"
outer-join="auto"
update="true"
insert="true"
access="property"
column="demandID"
/> name="demand"
class="com.xindeco.business.pojo.Demand"
cascade="none"
outer-join="auto"
update="true"
insert="true"
access="property"
column="demandID"
/>
class="com.xindeco.business.pojo.SysCode"
cascade="none"
outer-join="auto"
update="true"
insert="true"
access="property"
column="nation"
/> 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类为:
public class GraAppInfo{
private College college;
}
action 类为
public class GraAppAction
extends BaseAction {
public ActionForward add(ActionMapping mapping, ActionForm form,
HttpServletRequest request,
HttpServletResponse response) throws Exception {
graInfo.setCollege(new College());//必须从数据库找到college这个对象,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类save方法为
getHibernateTemplate().save(obj);
当cascade="all",插入new college 除了id和原来的记录一样,其他的字段全部都被更新,为null
当cascase=“insert”,插入new college 只会把它的id插入grainfo表中,其他字段不变。
17、java.sql.SQLException: Unable to convert between java.lang.Integer and BLOB.
因为
type="com.xindeco.business.pojo.SysCode"//不能用复杂类,
update="true"
insert="true"
access="property"
column="provinceId"
/> name="province"
type="com.xindeco.business.pojo.SysCode"//不能用复杂类,
update="true"
insert="true"
access="property"
column="provinceId"
/>
应该改为
class="com.xindeco.business.pojo.SysCode"
cascade="none"
outer-join="auto"
update="true"
insert="true"
access="property"
column="provinceId"
/> 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:
graduateList是一个类,而logic:iterator要求必须是ArrayList,HashSet....这样的集合类,而graduateList中一个属性是ArrayList或HashSet的
应改为:
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());
当hibernate session取出数据放到http session时,
由于sysuser中role的lazy=“true”,所以没有将RoleName放到http session中,当System.out.println(user.getRole().getRoleName());
时,虽然http session还开着, hibernat seesion已经关闭
class="com.xindeco.business.pojo.SysRole"
lazy="false"
cascade="none"
outer-join="auto"
update="true"
insert="true"
access="property"
column="roleID"
/> 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
因为application.xml文件中没有配置
系统找不到WFNode
table = "WF_ROLENODES "
lazy = "true "
inverse = "false "
cascade = "none "
sort = "unsorted "
> name = "nodes "
table = "WF_ROLENODES "
lazy = "true "
inverse = "false "
cascade = "none "
sort = "unsorted "
>
> column = "roleID "
>
key >
column = "nodeId "
outer - join = "auto "
/> class = "com.xindeco.workflow.WFNode "
column = "nodeId "
outer - join = "auto "
/>
set >
12:45 | 永久链接 | 浏览 (184) | 评论 (0) | struts |
logic:Iterator标签(以下简称“该标签”)是Struts里非常常用的一个标签,其作用在于循环显示给定容器对象中的值。
如此常用的标签,其源代码当然需要拿出来研究一下,以下列举几条研究成果:
1、该标签内部使用Collection来表示给定的容器,所有的给定容器对象(如ArrayList,Map等)都会被其转化成为Collection,Collection实际就是Map和List的父类。
2、该标签自己维护循环索引,不用程序员管理索引
3、该标签常见的几个属性如下:name、property、scope、id
对应Struts给出的Api说明如下:
name:包括要遍历Collection的Jsp页面的bean的名字(如果property没有被定义),或者是那些通过getter方法获得属性的Jsp中的Bean的名字,这些getter方法返回的是Collection(如果property定义了)。
property:在name命名的Jsp bean中定义的属性的名字,通过getter方法返回一个Collection
scope:指示到哪里去寻找name为名字的bean,如果没有定义缺省为"any scope"
id:如果Collection非空的话,在每次遍历时候Collection中每个元素的名字。
其中除了id每个元素均为Rt expr,这儿的rt expr的意思就是Run Time Expression。明确的说就是,如果你对一个Attribute的
只有id是必须要说明的。
关于Api说明的说明:
id只是一个临时标识,在下面的
举例说明
以下代码生成一个阶梯状表格
系统 资源 操作
soft3
res3
opt3
soft12
res12
opt1211
soft11
res11
opt1111
在此之前传来一个request.getAttribute("userPurview"),所以有在第一个logic中的userPurview,就是在这个request里面寻找userPurview
返回的是一个list
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