Hibernate常见错误
1.错误:object references an unsaved transient instance - save the transient instance before flushing:
transient instance - save the transient instance before flushing: bean.java.Sysblog
解决方法:没有可预期的实例,当然就要实例化对象咯
2.错误:Exceptionobject references an unsaved transient instance - save the transient instance before flushing:
src.
解决方法:原因没有为某对象进行set设置, 如上边的这个就是某对象没有调用setProduct
3.错误:Illegal attempt to associate a collection with two
解决方法:(hibernate的session提供了一级缓存,每个session,对同一个id进行两次load,不会发送两条
sql给数据库,但是 session关闭的
时候,一级缓存就失效了。
sysblogarticle.setAmount(new Long(sysblogcommentService.selcom(
sysblogarticle.setSysblogcomments(null);//关键
sysblogarticleService.saveOrUpdate(sysblogarticle);//将文章中评论条数修改
参考:
[url=javaflasher.javaeye/blog/forum/17913][color=#0000ff]javaflasher.javaeye/blog/forum/17913[/color][/url]
4.错误:Hbm映射文件都生成好后,改数据库增加了默认值(如:将某个字段值设为1),结果在插入的时候,数据库那边没有反应。
解决方法: 在sql-type里面定义数据库默认值,那么SchemeExport的时候,DDL就会加上default。然后h
bm定义为dynamic- insert="true"和
dynamic-update="true"
.......
........
5.错误:
2008-2-2 9:45:13 org.hibernate.util.JDBCExceptionReporter logExceptions
严重: Unknown column 'tjsaleresu0_.isupdate' in 'field list'
2008-2-2 9:45:13 org.hibernate.event.def.DefaultLoadEventListener onLoad
信息: Error performing load command
ption.SQLGrammarException: could not load an entity: [ookj.domain.TjSaleResult#293]
--数据库中没有“isupdate”字段
6.错误:
2008-2-2 9:51:42 org.hibernate.util.JDBCExceptionReporter logExceptions
警告: SQL Error: 1052, SQLState: 23000
2008-2-2 9:51:42 org.hibernate.util.JDBCExceptionReporter logExceptions
严重: Column 'df' in where clause is ambiguous
————find("select tsr from TjSaleResult tsr, TjItemResult tir where tsr=tir.saleResultId and tir=? and df1", new Object
[]{tir});
————语句中的df不能确定是哪个表的
7.错误
hibernate3.HibernateQueryException: could not resolve property: trackDate of:
ookj.domain.TjReagentTrack [from ookj.domain.TjReagentTrack trt ackStage=? ackDate=? and trt.userId=?
and trt.df1]; nested exception is org.hibernate.QueryException: could no
t resolve property: trackDate of:
ookj.domain.TjReagentTrack [from ookj.domain.TjReagentTrack trt ackStage=? ackDate=? and trt.userId=?
and trt.df1]
Caused by: org.hibernate.QueryException: could not resolve property: trackDate of: ookj.domain.TjReagentTrack [from
ookj.domain.TjReagentTrack trt ackStage=? ackDate=? and trt.userId=? and trt.df1]
————问题是配置中:
private static String[][] properties={
{"getReagentTrackId","reagent_trackid","0"},
{"getReagentId","reagentid","1"},
{"getUserId","userid","1"},
{"getGuideBookId","guidebookid","1"},
spring framework jar包{"getTrackTime","tracktime","0"}, //这里名称不对
{"trackStage","trackstage","0"},
{"getDf","df","0"}
————还有ackDate=? 语句中的值有误。
8.错误
java.lang.ClassCastException: ookj.domain.OokjDateTime
————基本的 类型转换错误
9.错误
org.springframework.dao.InvalidDataAccessApiUsageException: object references an unsaved transient instance - save the
transient instance before flushing: ookj.domain.SmDept; nested exception is org.hibernate.TransientObjectException: object
references an unsaved transient instance - save the transient instance before flushing: ookj.domain.SmDept
Caused by: org.hibernate.TransientObjectException: object references an unsaved transient instance - save the transient
instance before flushing: ookj.domain.SmDept
————new了一个新对象,在未保存之前将它保存进了一个新new的对象。
10.错误
信息: could not read column value from result set: activep19_59_; could not deserialize
Exception in thread "main" hibernate3.HibernateSystemException: could not deserialize; nested
exception is pe.SerializationException: could not deserialize
Caused by: pe.SerializationException: could not deserialize
我用的数据库是mysql,在通过pojo类自动生成的类中,未为字段指定type,hibernate对自动为其指定,如果它所生成的type不能被反序列化
,就会抛出java.util.ServilizableException
比如我产生异常的原因是我建立了一个string[]类型的字段,但在对应的.l文件中我没有显式定义它的类型,hibernate自动为其指定了
类型,该类型不能被反序列化。
11.错误
严重: line 1:143: expecting IDENT, found '.'
2008-2-3 0:41:01 org.StandardWrapperValve invoke
严重: Servlet.service() for servlet tijianServlet threw exception
hibernate3.HibernateQueryException: expecting IDENT, found '.' near line 1, column 143 [select
dicalGroup from ookj.domain.TjSaleResult t where t.guideBookId=? and dicalGroup.block=? and
dicalGroup.df1]; nested exception is org.hibernate.hql.ast.QuerySyntaxException: expecting IDENT, fou
nd '.'
near line 1, column 143 [select dicalGroup from ookj.domain.TjSaleResult t where t.guideBookId=? and
dicalGroup.block=? and dicalGroup.df1]
Caused by: org.hibernate.hql.ast.QuerySyntaxException: expecting IDENT, found '.' near line 1, column 143 [select
dicalGroup from ookj.domain.TjSaleResult t where t.guideBookId=? and dicalGroup.block=? and
dicalGroup.df1]
_____多了一个点
12.错误
java.SocketException: java.ConnectException: Connection refused: connect
————数据库未启动
13.错误
严重: Servlet.service() for servlet tijianServlet threw exception
java.lang.NoSuchMethodError: ookj.service.SendReagentService.saveTjSendReagent
(Lookj/domain/TjReagent;Lookj/domain/SaleGuideBook;)[Ljava/lang/String;
————Tomcat\Java虚拟集中代码未跟上,不能保持同步,重启虚拟机就好了。
偶嘀错误集合 [转贴 2007-03-04 15:19:00]
1. 做Hibernate多对一的时候遇到错误
(1)org.apache.jasper.JasperException: Error creating bean with name 'sf' defined in ServletContext resource [/WEB-
l]: Initialization of bean failed; nested exception is org.hibernate.PropertyNotFoundException:
Could not find a getter for person in class com.accp.vo.Course
因为配置文件中的一个 中的person属性名称写错了.
还有原因如下:
1)getter()方法写错了,没有按照javaBean的规则写.
2)*.l中的属性名和pojo中的是否一致.注意:属性名是否多了空格.
(2).Hibernate多对一报错:
save the transient instance before flushing
具体错误为在one-to-many中,对many进行save时,由于没有加入one的外建,导致错误。
具体解决方法:
(1)、在one的hbm文件中 invest=true
(2)、在many保存前务必要求one的存在
2.spring+struts+hibernate 项目debug总结
(1) javax.servlet.ServletException: Cannot retrieve mapping for action /companyNews
(2) 在myeclipse增加一个jar包时候,先打开项目properties,选择java build path --> libraries -->add external JARs 选择到需要的
jar包,加入后,发现,他这个包加载的是绝对路径,而我们的项目需要cvs共享,无法commit到cvs服务器。myeclipse有以下提示信息:
2 build path entries are missing.
解决办法是,关闭myeclipse,用notepad打开项目目录下的 .classpath, 手动修改成相对路径,并且检 查,指定的相对路径中是否真正添
加了jar包,启动myeclipse就可以上传新添加的jar包了。
(3) 在使用junit/StrutsTest时候,报错:
java.lang.UnsupportedClassVersionError: junit/framework/TestListener (Unsupported major.minor version 49.0)
原因是如果是jdk1.4的话,只能使用junit3.8以下版本,如果是使用jdk1.5的话,必须使用junit4.0 以上版本。
(4) Canno
t find ActionMappings or ActionformBeans collection
原因是:l文件中没有配置l的相关信息。
(5) org.apache.jasper.JasperException: The absolute uri:
[url=java.sun/jstl/core][color=#0000ff]java.sun/jstl/core[/color][/url]
cannot be resolved in l
or the jar files deployed with this application
缺少jstl的相关jar和l配置
jstl.jar
java.sun/jstl/fmt
/WEB-INF/fmt.tld
java.sun/jstl/fmt-rt
/WEB-INF/fmt-rt.tld
java.sun/jstl/core
/WEB-INF/c.tld
java.sun/jstl/core-rt
/WEB-INF/c-rt.tld
java.sun/jstl/sql
/WEB-INF/sql.tld
java.sun/jstl/sql-rt
/WEB-INF/sql-rt.tld
java.sun/jstl/x
/WEB-INF/x.tld
java.sun/jstl/x-rt
/
WEB-INF/x-rt.tld
(5) Failed to load or instantiate TagLibraryValidator class: org.apache.taglibs.standard.tlv.JstlCoreTLV
standard.jar没有放在lib里面
(6) 创建oracle表的时候,使用了,role和comment关键字,建议不要将这两个关键字作为表名和字段名。
建议用toad或plsql developer创建表,这样软件会提示关键字。
(7) [ERROR] XMLHelper - Error parsing XML: XML InputStream(18) Attribute name "column" associated with an element type "key"
must be followed by the ' = ' character.
[ERROR] Configuration - Could not configure datastore from input stream org.dom4j.DocumentException: Error
on line 18 of document : Attribute name "column" associated with an element type "key" must be followed by the ' = '
character. Nested exception: Attribute name "column" associated with an element
type "key" must be followed by the ' = ' character.
xml 语法错误,key语法中应该类似这样的写法
(8) hibernate3,对象中一对多的one方,必须写private Set pays=new HashSet();,否则包错java.lang.NullPointerException ,
而hibernate2中private Set pays;却不报错;
(9) [DEBUG] AbstractSaveEventListener - generated identifier: 1, using strategy: org.hibernate.id.IncrementGenerator
org.hibernate.PropertyValueException: not-null property references a null or transient value: pany
at ine.Nullability.checkNullability(Nullability.java:72)
中的设置应该设置为not-null="false" ,设置为not-null="true"则报以上错误
(10) org.hibernate.TransientObjectException: object references an unsaved transient instance - save the transient instance
before flushing: Company
在save的同时也需要save其他的表,然后再flush()
(11) Parse Fatal Error at line 12 column 1
(12)org.hibernate.QueryException: could not resolve property: userid of:
使用到外键userid的时候,必须使用userinfo.userid方法才能得到。
(13)javax.naming.NameNotFoundException: Name hibernate_connection_factory is not
bound in this Context 原因:hibernate的数据库映射.xml文件有配置错误,导致hibernate_connection_factory无法绑定数据库。
例如many-to-one设置了以后,仍然在其中设置相冲突的属性。
(14) [WARN] RequestProcessor - Unhandled Exception thrown: class java.lang.NullPointerException
必须将使用到的对象new起来。
(15) GROUP BY 表达式的查询必须满足如下:
select 子句后的每一项必需出现在group by 子句中,除非该项使用了聚集函数。
(16) org.hibernate.TransientObjectException: object references an unsaved transient
instance - save the transient instance before flushing: Company
要级联保存,多次session.save()
(17)
java.lang.IllegalArgumentException: id to load is required for loading
原因:
session.load(Company.CompanyId());
load()方法第二个参数必须是searlizable,并且必须是和数据库映射类的属性值类型一致,即使强制转换都不行。
(18) [INFO] DefaultLoadEventListener - Error performing load command org.hibernate.ObjectNotFoundException: No row with the given identifier exists: [Company#0]
表示你现在查询的对象所关联的对象有问题,一般是因为数据的问题(该对象所关联的对象不到),数据的错误,影响了程序正常执行。
(19)
eclipse 3.1,myeclipse 4错误
Deployment is out of date due to changes in the underlying project contents . You'll need to mannally 'Redeploy' the project
to update the deployed archive.
原因
tomcat 中部署的某个文件的拒绝访问影响了部署。
重启后,去除tomcat中部署的文件。重新在eclipse中设置部署。
为什么需要重启?
因为:google desktop软件正在对我部署的一个300MB大文件进行索引,锁定了这个大文件,我估计google desktop需要对这个文件索引半个小
时以上。因此,eclipse无法对过去部署的文件,做先删除后重新部署的工作。
(20) ERROR LazyInitializationException:19 - could not initialize proxy - the owning Session was closed
org.hibernate.LazyInitializationException: could not initialize proxy - the owning Session was closed
解决办法。
cmpy=(CompanyEdit)ss.load(CompanyEdit.class,companyId1);
Hibernate.initialize(cmpy);//强制初始化cmpy,否则ss.close()后,cmpy将消失.
(21) javascript错误
行: 56
字符: 45
错误: 未结束的字符串常量
代码: 0
是编码的问题!用ANSI编码另存后就好了。
(22) [WARN] JDBCExceptionReporter - SQL Error: 904, SQLState: 42000
[ERROR] JDBCExceptionReporter - ORA-00904: 无效列名 [INFO] DefaultLoadEventListener - Error performing load command
ption.SQLGrammarException: could not load an entity: [Sellinfo#1]
***.l文件中的某个列名和数据库中的不同。
(23) ConnectionManager - unclosed connection, forgot to call close() on your session?
原因:没有关闭hibern
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