在Struts2中，EL表达式是通过OGNL（Object-GraphNavigationLanguage）来执行的。EL表达式可以在Struts2的jsP页面或配置文件中使用。在JSP页面中，可以使用EL表达式来获取Action类中的属性值。例如，通过`${actionName.propertyName}`来获取Ac...

@NotBlank,@NotNoll,@NotEmpty实体字段校验之间的区别简单的来说字符串用@NotBlank基本类型用@NotNoll集合类型@NotEmpty...

文档解释ORA-48502:InvalidCommandLine–MissingRequiredElementsCause:Missingrequiredcommandlinearguments.Action:Reviewthehelpmessageandsupplytherequiredarguments...

文档解释ORA-44303:servicenameexistsCause:Thisservicenamewasalreadyinexistence.Action:Provideanewuniqueservicename.ORA-44303错误消息是Oracle数据库定义的一个错误消息，表示提供的服务名称已存在（空间不允...

文档解释ORA-55339:avirtualmodelalreadyexistsforthespecifiedmodel-rulebasecombinationCause:Avirtualmodelwithidenticalcomponentswasalreadypresent.Action:Chooseadiffer...

文档解释ORA-24167:incompatibleruleengineobjects,cannotdowngradeCause:thereareruleengineobjectsinthedatabasethatcannotbedowngraded.Action:checkutlincmp.sqlandremovea...

文档解释ORA-39907:Indexstring.stringintablespacestringpointstotablestring.stringintablespacestring.Cause:Informationalmessagetodescribeafailureduringtransportableco...

文档解释ORA-26906:Nochangehandlerexists.Cause:Therewasnochangehandlerforthespecifiedapply,operation,sourcetable,changetable,andcapturevalues.Action:QueryDBA_APPLY_C...

文档解释ORA-25197:anoverflowsegmentalreadyexistsfortheindexed-organizedtableCause:AnattemptwasmadetoADDOVERFLOWsegmentonanindex-organizedtablethatalreadyhasanoverfl...

文档解释ORA-55628:FlashbackArchivesupportsOracle11gorhigherCause:AnattemptwasmadetocreatedaFlashbackArchivewithincorrectcompatiblemodeorwithoutautoundomanagement.Ac...

文档解释ORA-41662:numberofprimitiveeventsinthecompositeeventexceedsmaximumlimitCause:Anattemptwasmadetocreateacompositeeventstructurewithmorethan32primitiveevents.A...

文档解释ORA-49429:FilealreadyexistsandOVERWRITEoptionnotspecified[string]Cause:Theclientattemptedtocreateafilethatalreadyexists.Action:EitherremovethefileorusetheOV...

文档解释ORA-28539:gatewaydoesnotsupportresultsetsCause:Theclientprogramtriedexecutingastoredprocedurethatreturnsoneormoreresultsetsthroughagatewaythatdoesnothaveres...

文档解释ORA-28274:NoORACLEpasswordattributecorrespondingtousernicknameexists.Cause:LDAPuserentrycorrespondingtousernicknamedoesnothaveaORACLEpasswordattributeorthea...

文档解释ORA-41654:insufficientnumberofprimitiveeventsfortheuseof“sequence”Cause:Anattemptwasmadetouse“sequence”attributewhenthereisaninsuffi...