Junky's IT Notebook

          統(tǒng)計(jì)

          留言簿(8)

          積分與排名

          WebSphere Studio

          閱讀排行榜

          評(píng)論排行榜

          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(méi)有寫(xiě)相關(guān)companyNews的action.

          ============================================
          在myeclipse增加一個(gè)jar包時(shí)候,先打開(kāi)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(wú)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(kāi)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。


          =============================================
          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。






          ==========================================================

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


          ============================================================

          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

          ?
          http://java.sun.com/jstl/fmt
          ? /WEB-INF/fmt.tld



          ?
          http://java.sun.com/jstl/fmt-rt
          ? /WEB-INF/fmt-rt.tld



          ?
          http://java.sun.com/jstl/core
          ? /WEB-INF/c.tld



          ?
          http://java.sun.com/jstl/core-rt
          ? /WEB-INF/c-rt.tld



          ?
          http://java.sun.com/jstl/sql
          ? /WEB-INF/sql.tld



          ?
          http://java.sun.com/jstl/sql-rt
          ? /WEB-INF/sql-rt.tld



          ?
          http://java.sun.com/jstl/x
          ? /WEB-INF/x.tld



          ?
          http://java.sun.com/jstl/x-rt
          ? /WEB-INF/x-rt.tld



          ==========================================================

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


          standard.jar沒(méi)有放在lib里面


          ===========================================================

          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。
          =============================================================

          [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

          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(yǔ)法錯(cuò)誤,key語(yǔ)法中應(yīng)該類(lèi)似這樣的寫(xiě)法
          =============================================================
          hibernate3,對(duì)象中一對(duì)多的one方,必須寫(xiě)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);

          =============================================================
          [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)

          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(yǔ)法錯(cuò)誤。檢查語(yǔ)法。

          ========================================

          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。

          =========================================
          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(wú)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)置相沖突的屬性。

          ==========================================

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

          ============================================
          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)。

          ===========================================
          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(lèi)的屬性值類(lèi)型一致,即使強(qiáng)制轉(zhuǎn)換都不行。


          =============================================
          [INFO] DefaultLoadEventListener - Error performing load command
          >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(wèn)題,一般是因?yàn)閿?shù)據(jù)的問(wèn)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。

          ========================================================
          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(wèn)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(wú)法對(duì)過(guò)去部署的文件,做先刪除后重新部署的工作。

          ===================================================
          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(wèn)題!用ANSI編碼另存后就好了。

          ====================================================
          [WARN] JDBCExceptionReporter - SQL Error: 904, SQLState: 42000
          [ERROR] JDBCExceptionReporter - ORA-00904: 無(wú)效列名

          [INFO] DefaultLoadEventListener - Error performing load command
          >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。


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


          原因:沒(méi)有關(guān)閉hibernate的session的transaction。或者沒(méi)有關(guān)閉session

          =======================================================
          [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 on 2007-03-09 18:12 junky 閱讀(763) 評(píng)論(0)  編輯  收藏 所屬分類(lèi): hibernate

          主站蜘蛛池模板: 商城县| 饶阳县| 古田县| 长治县| 古浪县| 自治县| 屯门区| 嘉祥县| 都匀市| 白朗县| 甘德县| 平罗县| 江山市| 喀喇沁旗| 浠水县| 北海市| 临沂市| 巴林右旗| 东辽县| 报价| 洛川县| 通城县| 赣州市| 隆林| 延长县| 牡丹江市| 柞水县| 溧阳市| 丰原市| 汤阴县| 呼伦贝尔市| 聊城市| 普洱| 镇江市| 大渡口区| 吉木萨尔县| 台安县| 岳阳市| 会理县| 敦煌市| 久治县|