spring+struts+hibernate 项目debug总结

spring+struts+hibernate 项目debug总结

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javax.servlet.ServletException Cannot retrieve mapping for action companyNews

struts-config.xml中没有写相关companyNews的action.

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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。

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在使用junitStrutsTest时候，报错：
java.lang.UnsupportedClassVersionError junitframeworkTestListener (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。

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Cannot find ActionMappings or ActionformBeans collection
原因是：web.xml文件中没有配置struts-config.xml的相关信息。

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org.apache.jasper.JasperException The absolute uri httpjava.sun.comjstlcore cannot be resolved in either web.xml or the jar files deployed with this application

缺少jstl的相关jar和web.xml配置
jstl.jar
taglib
taglib-urihttpjava.sun.comjstlfmttaglib-uri
taglib-locationWEB-INFfmt.tldtaglib-location
taglib

taglib
taglib-urihttpjava.sun.comjstlfmt-rttaglib-uri
taglib-locationWEB-INFfmt-rt.tldtaglib-location
taglib

taglib
taglib-urihttpjava.sun.comjstlcoretaglib-uri
taglib-locationWEB-INFc.tldtaglib-location
taglib

taglib
taglib-urihttpjava.sun.comjstlcore-rttaglib-uri
taglib-locationWEB-INFc-rt.tldtaglib-location
taglib

taglib
taglib-urihttpjava.sun.comjstlsqltaglib-uri
taglib-locationWEB-INFsql.tldtaglib-location
taglib

taglib
taglib-urihttpjava.sun.comjstlsql-rttaglib-uri
taglib-locationWEB-INFsql-rt.tldtaglib-location
taglib

taglib
taglib-urihttpjava.sun.comjstlxtaglib-uri
taglib-locationWEB-INFx.tldtaglib-location
taglib

taglib
taglib-urihttpjava.sun.comjstlx-rttaglib-uri
taglib-locationWEB-INFx-rt.tldtaglib-location
taglib

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Failed to load or instantiate TagLibraryValidator class org.apache.taglibs.standard.tlv.JstlCoreTLV

standard.jar没有放在lib里面

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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。
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[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.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 key column=id
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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；

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[DEBUG] AbstractSaveEventListener - generated identifier 1, using strategy org.hibernate.id.IncrementGenerator
org.hibernate.PropertyValueException not-null property references a null or transient value com.xxx.yyy.company
at org.hibernate.engine.Nullability.checkNullability(Nullability.java72)

many to one 中的设置应该设置为not-null=false ，设置为not-null=true则报以上错误
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org.hibernate.TransientObjectException object references an unsaved transient instance - save the transient instance before flushing com.xxx.yyy.Company

在save的同时也需要save其他的表，然后再flush()
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Parse Fatal Error at line 12 column 1

struts-config.xml文件被修改，语法错误。检查语法。

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org.hibernate.QueryException could not resolve property userid of com.xxx.yyy.Pay

使用到外键userid的时候，必须使用userinfo.userid方法才能得到。

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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property属性。

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[WARN] RequestProcessor - Unhandled Exception thrown class java.lang.NullPointerException
必须将使用到的对象new起来。

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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。

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org.hibernate.TransientObjectException object references an unsaved transient instance - save the transient instance before flushing com.xxx.yyy.Company

要级联保存，多次session.save()
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java.lang.IllegalArgumentException id to load is required for loading
原因：

session.load(Company.class,payForm.getCompanyId());
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。

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[INFO] DefaultLoadEventListener - Error performing load command org.hibernate.ObjectNotFoundException No row with the given identifier exists [com.xxx.yyy.Company#0]

org.hibernate.ObjectNotFoundException No row with the given identifier exists [com.xxx.yyy.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找不到）,数据的错误，影响了程序正常执行。

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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。

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ERROR LazyInitializationException19 - 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.

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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。

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[WARN] JDBCExceptionReporter - SQL Error 904, SQLState 42000
[ERROR] JDBCExceptionReporter - ORA-00904 无效列名

[INFO] DefaultLoadEventListener - Error performing load command org.hibernate.exception.SQLGrammarException could not load an entity [com.xxx.yyy.Sellinfo#1]

org.hibernate.exception.SQLGrammarException could not load an entity [com.xxx.yyy.Sellinfo#1]

.hbm.xml文件中的某个列名和数据库中的不同。

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ConnectionManager - unclosed connection, forgot to call close() on your session

原因：没有关闭hibernate的session的transaction。或者没有关闭session

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[WARN] SellCommentDAO - org.hibernate.ObjectDeletedException deleted object would be re-saved by cascade (remove deleted object from associations) [com.xxx.yyy.SellComment#7]

原因：父亲对象（one方）设置cascade=save-update 时，直接删除子对象时，会报错，
处理方法：save信息需要级联操作，delete时候也要用相同的原理。
SellComment sellComment=new SellComment();
sellComment = (SellComment)session.load(SellComment.class,sellCommentId);获取儿子对象
Long sellInfoId=sellComment.getSellInfo().getSellId();获取父亲id
SellInfo sellinfo=(SellInfo)session.load(SellInfo.class,sellInfoId);获取父亲对象
sellInfo.getSellComments().remove(sellComment);断绝父子关系
sellComment.setSellInfo(null);断绝子父关系