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轉(zhuǎn)： javax.servlet.ServletException: Cannot retrieve mapping for action /companyNews struts-config.xml中沒有寫相關(guān)companyNews的action. ============================================ 在myeclipse 增加一個jar包時候，先打開項目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)，他這個包加載的是絕對路徑，而我們的項目需要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打開項目目錄下的 .classpath, 手動修改成相對路徑，并且檢查，指定的相對路徑中是否真正添加了jar包， 啟動myeclipse就可以上傳新添加的jar包了。 ============================================= 在使用junit/StrutsTest時候，報錯： 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文件中沒有配置struts-config.xml的相關(guān)信息。 ============================================================ org.apache.jasper.JasperException: The absolute uri: http://java./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./jstl/fmt</taglib-uri> <taglib-location>/WEB-INF/fmt.tld</taglib-location> </taglib> <taglib> <taglib-uri>http://java./jstl/fmt-rt</taglib-uri> <taglib-location>/WEB-INF/fmt-rt.tld</taglib-location> </taglib> <taglib> <taglib-uri>http://java./jstl/core</taglib-uri> <taglib-location>/WEB-INF/c.tld</taglib-location> </taglib> <taglib> <taglib-uri>http://java./jstl/core-rt</taglib-uri> <taglib-location>/WEB-INF/c-rt.tld</taglib-location> </taglib> <taglib> <taglib-uri>http://java./jstl/sql</taglib-uri> <taglib-location>/WEB-INF/sql.tld</taglib-location> </taglib> <taglib> <taglib-uri>http://java./jstl/sql-rt</taglib-uri> <taglib-location>/WEB-INF/sql-rt.tld</taglib-location> </taglib> <taglib> <taglib-uri>http://java./jstl/x</taglib-uri> <taglib-location>/WEB-INF/x.tld</taglib-location> </taglib> <taglib> <taglib-uri>http://java./jstl/x-rt</taglib-uri> <taglib-location>/WEB-INF/x-rt.tld</taglib-location> </taglib> ========================================================== Failed to load or instantiate TagLibraryValidator class: org.apache.taglibs.standard.tlv.JstlCoreTLV standard.jar沒有放在lib里面 =========================================================== 創(chuàng)建oracle表的時候，使用了，role和comment關(guān)鍵字，建議不要將這兩個關(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 <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 語法錯誤，key語法中應(yīng)該類似這樣的寫法 <key column="id"> ============================================================= hibernate3,對象中一對多的one方，必須寫private Set pays=new HashSet();，否則包錯java.lang.NullPointerException ， 而hibernate2中private Set pays;卻不報錯； ============================================================= [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"則報以上錯誤 ================================================================ 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，語法錯誤。檢查語法。 ======================================== org.hibernate.QueryException: could not resolve property: userid of: com.xxx.yyy.Pay 使用到外鍵userid的時候，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)庫映射.xml文件有配置錯誤，導(dǎo)致hibernate_connection_factory無法綁定數(shù)據(jù)庫。 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。 ========================================== [WARN] RequestProcessor - Unhandled Exception thrown: class java.lang.NullPointerException 必須將使用到的對象new起來。 ============================================ GROUP BY 表達(dá)式的查詢必須滿足如下： select 子句后的每一項必需出現(xiàn)在group by 子句中，除非該項使用了聚集函數(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()方法第二個參數(shù)必須是searlizable,并且必須是和數(shù)據(jù)庫映射類的屬性值類型一致，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] >org.hibernate.ObjectNotFoundException: No row with the given identifier exists: [com.xxx.yyy.Company#0] 表示你現(xiàn)在查詢的對象所關(guān)聯(lián)的對象有問題，一般是因為數(shù)據(jù)的問題（該對象所關(guān)聯(lián)的對象找不到）,數(shù)據(jù)的錯誤，影響了程序正常執(zhí)行。 ======================================================== eclipse 3.1,myeclipse 4錯誤 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？ 因為：google desktop軟件正在對我部署的一個300MB大文件進(jìn)行索引，鎖定了這個大文件，我估計google desktop需要對這個文件索引半個小時以上。因此，eclipse無法對過去部署的文件，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錯誤 行: 56 字符: 45 錯誤: 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。 ==================================================== [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文件中的某個列名和數(shù)據(jù)庫中的不同。 ======================================================= ConnectionManager - unclosed connection, forgot to call close() on your session? 原因：沒有關(guān)閉hibernate的session的transaction?；蛘邲]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：父親對象（one方）設(shè)置cascade="save-update" 時，直接刪除子對象時，會報錯， 處理方法：save信息需要級聯(lián)操作，delete時候也要用相同的原理。 SellComment sellComment=new SellComment(); sellComment = (SellComment)session.load(SellComment.class,sellCommentId);//獲取兒子對象 Long sellInfoId=sellComment.getSellInfo().getSellId();//獲取父親id SellInfo sellinfo=(SellInfo)session.load(SellInfo.class,sellInfoId);//獲取父親對象 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(); |
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