我尝试在oracle linux,tomcat 7和jdk1.7上运行web应用程序,并且在tomcat重启后第一页加载时出现异常.仅在第一个应用程序页面加载时发生异常.应用程序是在jdk1.6上开发的,在服务器上安装了jdk1.4-compact和jdk1.7,但是我在tomcat/bin/setclasspath.sh文件中输入了JAV1_HOME和JRE_HOME的jdk1.7路径.任何想法为什么我得到这个例外？
Jan 03, 2012 5:11:28 PM org.apache.catalina.startup.Catalina start
INFO: Server startup in 10261 ms
Jan 03, 2012 5:15:49 PM org.apache.commons.digester.Digester getParser
SEVERE: Digester.getParser:
java.lang.UnsupportedOperationException: This parser does not support specification "null" version "null"
at javax.xml.parsers.SAXParserFactory.setSchema(SAXParserFactory.java:419)
at org.apache.commons.digester.Digester.getFactory(Digester.java:541)
at org.apache.commons.digester.Digester.getParser(Digester.java:791)
at org.apache.commons.digester.Digester.getXMLReader(Digester.java:1068)
at org.apache.commons.digester.Digester.parse(Digester.java:1916)
at org.apache.tiles.definition.digester.DigesterDefinitionsReader.read(DigesterDefinitionsReader.java:329)
at org.apache.tiles.definition.dao.BaseLocaleUrlDefinitionDAO.loadDefinitionsFromURL(BaseLocaleUrlDefinitionDAO.java:276)
at org.apache.tiles.definition.dao.CachingLocaleUrlDefinitionDAO.loadDefinitionsFromURLs(CachingLocaleUrlDefinitionDAO.java:251)
at org.apache.tiles.definition.dao.ResolvingLocaleUrlDefinitionDAO.loadDefinitionsFromURLs(ResolvingLocaleUrlDefinitionDAO.java:65)
at org.apache.tiles.definition.dao.ResolvingLocaleUrlDefinitionDAO.loadParentDefinitions(ResolvingLocaleUrlDefinitionDAO.java:58)
at org.apache.tiles.definition.dao.CachingLocaleUrlDefinitionDAO.loadDefinitionsFromURLs(CachingLocaleUrlDefinitionDAO.java:239)
at org.apache.tiles.definition.dao.ResolvingLocaleUrlDefinitionDAO.loadDefinitionsFromURLs(ResolvingLocaleUrlDefinitionDAO.java:65)
at org.apache.tiles.definition.dao.ResolvingLocaleUrlDefinitionDAO.loadParentDefinitions(ResolvingLocaleUrlDefinitionDAO.java:58)
at org.apache.tiles.definition.dao.CachingLocaleUrlDefinitionDAO.loadDefinitionsFromURLs(CachingLocaleUrlDefinitionDAO.java:239)
at org.apache.tiles.definition.dao.ResolvingLocaleUrlDefinitionDAO.loadDefinitionsFromURLs(ResolvingLocaleUrlDefinitionDAO.java:65)
at org.apache.tiles.definition.dao.CachingLocaleUrlDefinitionDAO.loadDefinitions(CachingLocaleUrlDefinitionDAO.java:222)
at org.apache.tiles.definition.dao.CachingLocaleUrlDefinitionDAO.checkAndloadDefinitions(CachingLocaleUrlDefinitionDAO.java:204)
at org.apache.tiles.definition.dao.CachingLocaleUrlDefinitionDAO.getDefinitions(CachingLocaleUrlDefinitionDAO.java:154)
at org.apache.tiles.definition.dao.CachingLocaleUrlDefinitionDAO.getDefinition(CachingLocaleUrlDefinitionDAO.java:123)
at org.apache.tiles.definition.dao.CachingLocaleUrlDefinitionDAO.getDefinition(CachingLocaleUrlDefinitionDAO.java:54)
at org.apache.tiles.definition.UnresolvingLocaleDefinitionsFactory.getDefinition(UnresolvingLocaleDefinitionsFactory.java:105)
at …我有一个包含A,B,C,D,E,F列的数据行...我怎么能写一个sql select来得到结果:
Col1, Col2
A, B
C, D
E, F
...
编辑:只有一行和动态列数.我不允许使用information_schema和sys表.同样有趣的是知道如何为整个表(多个A,B,C,D,E ..行),而不是唯一的行.