2007年4月13日

struts+hibernate項(xiàng)目debug總結(jié)

struts+hibernate項(xiàng)目debug總結(jié)

轉(zhuǎn)：

javax.servlet.ServletException: Cannot retrieve mapping for action /companyNews

struts-config.xml中沒有寫相關(guān)companyNews的action.

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在myeclipse 增加一個(gè)jar包時(shí)候，先打開項(xiàng)目properties,選擇java build path --> libraries -->add external JARs 選擇到需要的jar包，加入后，發(fā)現(xiàn)，他這個(gè)包加載的是絕對(duì)路徑，而我們的項(xiàng)目需要cvs共享，無法

commit到cvs服務(wù)器。myeclipse有以下提示信息：
2 build path entries are missing.

解決辦法是，關(guān)閉myeclipse,用notepad打開項(xiàng)目目錄下的 .classpath, 手動(dòng)修改成相對(duì)路徑，并且檢查，指定的相對(duì)路徑中是否真正添加了jar包，
啟動(dòng)myeclipse就可以上傳新添加的jar包了。

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在使用junit/StrutsTest時(shí)候，報(bào)錯(cuò)：
java.lang.UnsupportedClassVersionError: junit/framework/TestListener (Unsupported major.minor version 49.0)

原因是如果是jdk1.4的話，只能使用junit3.8以下版本，如果是使用jdk1.5的話，必須使用junit4.0以上版本。

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Cannot find ActionMappings or ActionformBeans collection
原因是：web.xml文件中沒有配置struts-config.xml的相關(guān)信息。

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org.apache.jasper.JasperException: The absolute uri: http://java.sun.com/jstl/core cannot be resolved in either web.xml or the jar files deployed with this application

缺少jstl的相關(guān)jar和web.xml配置
jstl.jar
<taglib>
<taglib-uri>http://java.sun.com/jstl/fmt</taglib-uri>
<taglib-location>/WEB-INF/fmt.tld</taglib-location>
</taglib>

<taglib>
<taglib-uri>http://java.sun.com/jstl/fmt-rt</taglib-uri>
<taglib-location>/WEB-INF/fmt-rt.tld</taglib-location>
</taglib>

<taglib>
<taglib-uri>http://java.sun.com/jstl/core</taglib-uri>
<taglib-location>/WEB-INF/c.tld</taglib-location>
</taglib>

<taglib>
<taglib-uri>http://java.sun.com/jstl/core-rt</taglib-uri>
<taglib-location>/WEB-INF/c-rt.tld</taglib-location>
</taglib>

<taglib>
<taglib-uri>http://java.sun.com/jstl/sql</taglib-uri>
<taglib-location>/WEB-INF/sql.tld</taglib-location>
</taglib>

<taglib>
<taglib-uri>http://java.sun.com/jstl/sql-rt</taglib-uri>
<taglib-location>/WEB-INF/sql-rt.tld</taglib-location>
</taglib>

<taglib>
<taglib-uri>http://java.sun.com/jstl/x</taglib-uri>
<taglib-location>/WEB-INF/x.tld</taglib-location>
</taglib>

<taglib>
<taglib-uri>http://java.sun.com/jstl/x-rt</taglib-uri>
<taglib-location>/WEB-INF/x-rt.tld</taglib-location>
</taglib>

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

standard.jar沒有放在lib里面

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創(chuàng)建oracle表的時(shí)候，使用了，role和comment關(guān)鍵字，建議不要將這兩個(gè)關(guān)鍵字作為表名和字段名。
建議用toad或plsql developer創(chuàng)建表，這樣軟件會(huì)提示關(guān)鍵字。
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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 語法錯(cuò)誤，key語法中應(yīng)該類似這樣的寫法 <key column="id">
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hibernate3,對(duì)象中一對(duì)多的one方，必須寫private Set pays=new HashSet();，否則包錯(cuò)java.lang.NullPointerException ，
而hibernate2中private Set pays;卻不報(bào)錯(cuò)；

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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.java:72)

<many to one >中的設(shè)置應(yīng)該設(shè)置為not-null="false" ，設(shè)置為not-null="true"則報(bào)以上錯(cuò)誤
================================================================

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

在save的同時(shí)也需要save其他的表，然后再flush()
=========================================================================

Parse Fatal Error at line 12 column 1

struts-config.xml文件被修改，語法錯(cuò)誤。檢查語法。

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

使用到外鍵userid的時(shí)候，必須使用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的數(shù)據(jù)庫(kù)映射.xml文件有配置錯(cuò)誤，導(dǎo)致hibernate_connection_factory無法綁定數(shù)據(jù)庫(kù)。
例如many-to-one設(shè)置了以后，仍然在其中設(shè)置相沖突的<property>屬性。

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[WARN] RequestProcessor - Unhandled Exception thrown: class java.lang.NullPointerException
必須將使用到的對(duì)象new起來。

============================================
GROUP BY 表達(dá)式的查詢必須滿足如下：
select 子句后的每一項(xiàng)必需出現(xiàn)在group by 子句中，除非該項(xiàng)使用了聚集函數(shù)。

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

要級(jí)聯(lián)保存，多次session.save()
==============================================
java.lang.IllegalArgumentException: id to load is required for loading
原因：

session.load(Company.class,payForm.getCompanyId());
load()方法第二個(gè)參數(shù)必須是searlizable,并且必須是和數(shù)據(jù)庫(kù)映射類的屬性值類型一致，即使強(qiáng)制轉(zhuǎn)換都不行。

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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]

表示你現(xiàn)在查詢的對(duì)象所關(guān)聯(lián)的對(duì)象有問題，一般是因?yàn)閿?shù)據(jù)的問題（該對(duì)象所關(guān)聯(lián)的對(duì)象找不到）,數(shù)據(jù)的錯(cuò)誤，影響了程序正常執(zhí)行。

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eclipse 3.1,myeclipse 4錯(cuò)誤
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 中部署的某個(gè)文件的拒絕訪問影響了部署。
重啟后，去除tomcat中部署的文件。重新在eclipse中設(shè)置部署。
為什么需要重啟？
因?yàn)椋篻oogle desktop軟件正在對(duì)我部署的一個(gè)300MB大文件進(jìn)行索引，鎖定了這個(gè)大文件，我估計(jì)google desktop需要對(duì)這個(gè)文件索引半個(gè)小時(shí)以上。因此，eclipse無法對(duì)過去部署的文件，做先刪除后重新部署的工作。

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ERROR LazyInitializationException:19 - could not initialize proxy - the owning Session was closed

org.hibernate.LazyInitializationException: could not initialize proxy - the owning Session was closed
解決辦法。
cmpy=(CompanyEdit)ss.load(CompanyEdit.class,companyId1);
Hibernate.initialize(cmpy);//強(qiáng)制初始化cmpy,否則ss.close()后,cmpy將消失.

====================================================
javascript錯(cuò)誤
行: 56
字符: 45
錯(cuò)誤: 未結(jié)束的字符串常量
代碼: 0

是編碼的問題！用ANSI編碼另存后就好了。

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

[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文件中的某個(gè)列名和數(shù)據(jù)庫(kù)中的不同。

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

原因：沒有關(guān)閉hibernate的session的transaction。或者沒有關(guān)閉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：父親對(duì)象（one方）設(shè)置cascade="save-update" 時(shí)，直接刪除子對(duì)象時(shí)，會(huì)報(bào)錯(cuò)，
處理方法：save信息需要級(jí)聯(lián)操作，delete時(shí)候也要用相同的原理。
SellComment sellComment=new SellComment();
sellComment = (SellComment)session.load(SellComment.class,sellCommentId);//獲取兒子對(duì)象
Long sellInfoId=sellComment.getSellInfo().getSellId();//獲取父親id
SellInfo sellinfo=(SellInfo)session.load(SellInfo.class,sellInfoId);//獲取父親對(duì)象
sellInfo.getSellComments().remove(sellComment);//斷絕父子關(guān)系
sellComment.setSellInfo(null);//斷絕子父關(guān)系
session.delete(sellComment);//刪除兒子
session.flush();

posted @ 2007-04-13 15:51 水里的魚閱讀(278) | 評(píng)論 (0) | 編輯收藏

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2007年4月13日

struts+hibernate項(xiàng)目debug總結(jié)

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